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Enjoy a stress-free experience with Vita Modular — specialists in bespoke, structural steel-frame prefabricated and modular house extensions installed right across the UK. The structural components of our system are fabricated off-site in our factory, then your extension is assembled and finished on-site — combining factory precision with a proper, integrated build.
Whether you live in a Victorian terrace, a 1930s semi or a detached family home, a well-designed extension is one of the smartest ways to add significant living space and property value — without the cost, mess and uncertainty of a traditional build. Our builds are fully building control compliant, meeting exactly the same compliance standards as a traditional build, and we manage all statutory approval processes for you as part of our turnkey service.
Our modular approach makes extensions faster, cleaner and more cost-effective than conventional construction — around 70% faster and up to 25% cheaper — without sacrificing design, quality or performance. And every build is 100% bespoke and fully customisable: any size, layout, configuration and finish, engineered around your home rather than pulled from a fixed catalogue, with an industry-leading 10-year guarantee on all builds.
A prefab extension and a modular extension are the same thing — an extension whose structural components are factory-built off-site, then assembled and finished on-site. Here's how our hybrid approach works and why it's transforming the way the UK extends.
With a prefab extension (short for prefabricated extension), the structural components — the steel frame and insulated wall, floor and roof panels — are fabricated off-site in controlled factory conditions, then delivered and assembled into place at your property. Because the structure is being built in the factory while your groundworks go in, a modular extension reaches completion far faster than a traditional brick-and-block build — with less mess, less risk and a fixed price agreed up front.
As one of the UK's leading providers of prefab extensions, every Vita Modular build is engineered around a structural steel frame and finished to full building-regulation standard. Whether you're searching for prefab extensions UK, modular extensions UK or a ready-made extension for your house, the principle is the same: a precision-built, pre-built extension delivered on a guaranteed timeline.
Our prefab extensions UK-wide service covers single-storey rear extensions, side returns, wrap-around extensions and two-storey extensions — each one bespoke, never a fixed kit. A pre-built extension from Vita is fully customisable in size, layout, configuration and external finish, so it complements your existing home rather than looking bolted on.
Every prefab and modular extension is delivered with our fixed, all-inclusive price, a guaranteed 4-week lead time to start on site, and an industry-leading 10-year structural warranty as standard.
Building out to the side or rear of your home is one of the most popular and best-value ways to add space — from terraces and semis to detached homes. Our off-site method is ideally suited to side returns and rear extensions alike, even where access is tight.
Side & rear extensions explained. A rear extension builds out from the back of your house into the garden, while a side extension fills in the gap alongside it — often the narrow side return beside a galley kitchen. Both square off and open up the property, and combined as a wrap-around they turn a cramped, dark kitchen into a wide, light-filled kitchen-living-dining room — the open-plan space families use most.
Why they add so much value. Because they create the room buyers and families want most, side and rear extensions deliver one of the strongest returns of any home improvement — adding tremendous value to a home while keeping the rest of the house and garden intact.
Often permitted development. Many single-storey side and rear extensions fall under permitted development rights, meaning no full planning application — though conservation areas, listed buildings and Article 4 directions can change this. We confirm exactly what your local authority requires before you commit.
Built for tight access. Side and rear extensions often face awkward access — narrow side alleys, no rear vehicle access and neighbours on both sides, typical of town-centre terraces and older streets. Because our structural components are manufactured off-site and assembled by hand without cranes, we can build where traditional contractors struggle, with far less mess on the street.
Building control handled for you. Every side and rear extension is fully building control compliant, and we manage the drawings, submissions and approvals on your behalf as part of our turnkey service.
Rooflights and full-width glazing. To make the most of the new space, we design in roof glazing, skylights and full-width bi-fold or sliding doors that flood the room with light and open it onto the garden — especially valuable on side returns, where rooflights bring daylight deep into the plan.
A house extension is a major investment — so the choice of builder is critical. Traditional builds can drag on for months, with open-ended timescales, spiralling costs and constant disruption to family life. Our steel-frame hybrid method — the same approach used in high-rise commercial construction for decades — offers a faster, more predictable alternative.
Vita Modular's off-site precision manufacturing means your extension's structural panels arrive ready to assemble, dramatically cutting on-site time, weather risk and programme overruns — with a fixed price agreed before we start. Because the bulk of the build happens in our factory rather than in your home, you're spared the weeks of dust, noise, deliveries and skips that come with a traditional brick-and-block build.
Every wall, floor and roof panel is precision-engineered at our own production facility before it reaches your home — so the quality is locked in under factory conditions, not left to chance on a busy site.
Independent building control signs off your extension at every key stage. You get formal certification on completion and a structure engineered to be lived in comfortably, year round.
Foundations, steel frame, cladding, glazing, electrics, lighting, flooring and decoration are all in the number we quote. No provisional sums, no mid-build surprises, no creeping extras.
From silicon render to brick-slip to composite cladding, we match a period property exactly or make a bold contemporary statement — whatever suits your preferences and the homes' setting.
A guaranteed 4 week lead time from order means you can book the disruption into your calendar and know exactly when your new space will be ready.
Your contract carries a fixed completion date. There are no open-ended timescales and no "we'll be back next week" — the project finishes when we commit it will.
Because most of the structure is built panelised off-site while the groundworks can go in, most extensions are built on site in just 4-6 weeks — sparing you the months of mess a traditional build demands.
Our structures carry a 10-year warranty as standard, with insurance-backed cover available — protection that follows the property if you sell.
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Check NowAll Vita extensions are available in any bespoke size or configuration, and we can incorporate any number of additional extras — decked areas, canopies, roof projections, roof glazing, structural alterations, kitchens, bathrooms and underfloor heating — to maximise your extension's functionality.
A 5m x 3m contemporary fully glazed rear single storey extension, including significant structural alteration works, built for a client in Cheltenham. Built using the unique Vita Modular system and installed with full rear-elevation glazing for maximum natural light.
A traditional building transformed with a modern, expansive glazed extension that maximises the views over the landscaped gardens. Available in any uPVC or aluminium bi-folding, sliding or french door configuration.
A simple but elegant single storey wrap around (side and rear) extension on a tight-access site, covering a total floor area of 21 SQ/M. Finished with a clean contemporary silicon thincoat render and anthracite grey aluminium glazing.
An expansive 40 SQ/M extension in Warrington that exudes luxury with its clean geometric lines and crittall-style aluminium glazing. Finished in our masonry brick system, an exact match to the existing house.
Our versatile 2 storey modular builds are the perfect alternative to time-consuming and disruptive traditional extensions. 100% tailored to your exact specifications, allowing you to complement or contrast your existing building.
Vita Modular's 100% bespoke extensions and new builds redefine what it means to build your own space. Any shape, any size, any configuration — your imagination sets the boundaries, and we bring it to life with complete price transparency and uncompromising build quality.
Every build is 100% bespoke and fully customisable — yet the quoted price is still genuinely all-in. Every item here comes as standard on every Vita Modular extension, never an optional extra revealed later.
One fixed, all-inclusive price
Our modular house extensions start from £3,000 per m² inclusive — covering VAT, foundations, structural frame, external walls, roof, electrics, flooring and glazing. The benchmarks below show typical all-in costs by extension type, so you can budget with confidence.
| Extension type | Typical size | Price per m² (inc. VAT) | Typical all-in cost |
|---|---|---|---|
| Single-storey rear extension | 15–21 m² | from £3,000 | from £45,000 |
| Side return extension | 12–18 m² | from £3,000 | from £36,000 |
| Wrap-around extension | 21–28 m² | from £3,000 | from £63,000 |
| Two-storey extension | 30–40 m² | from £3,000 | from £90,000 |
A traditional builder typically quotes £3,800 per m² and up on a like-for-like basis once you add VAT, glazing, electrics, flooring, decoration and the inevitable variations — and that's before the cost of delays. Our fixed, all-inclusive price covers the lot from the start, so the figure you're quoted is the figure you pay.
| Vita Modular | Traditional builder | |
|---|---|---|
| Price per m² (all-in, inc. VAT) | from £3,000 | £3,800+ |
| Typical 18 m² rear extension | from ~£54,000 | ~£54,000–£68,000+ |
| Price certainty | Fixed, all-inclusive | Variable; extras & variations common |
| Time on site | On average 6 weeks on site | Often 10–16+ weeks |
| Street disruption | Minimal — no cranes, fewer deliveries | Prolonged; skips, deliveries, dust |
| Warranty | 10-year structural | Varies by builder |
Comparison figures for traditional builders are typical UK market estimates and vary by project, specification and access. Vita Modular prices are fixed and all-inclusive of our standard specification.
All figures are inclusive of VAT and our standard specification, and are subject to location. Exclusions such as demolitions, ground preparation, drainage works, professional fees, statutory approvals and new structural openings are quoted separately. Get an exact, itemised figure in minutes with our instant fixed price quotation form.
This featured Cheltenham project is a 15 m² single-storey rear extension finished in silicone render with full-width glazing. At a fixed, all-inclusive price of £45,000 inc. VAT — equivalent to £3,000 per m² — it covered foundations, structural steel frame, external walls and render, flat roof, electrics and lighting, flooring and aluminium doors, delivered to a guaranteed timeline.
This isn't experimental. Steel-frame hybrid construction — components manufactured off-site, then assembled on site — has been the backbone of high-rise commercial and office building for decades, trusted precisely because it's fast, predictable and structurally robust at scale. Vita Modular brings that same proven, time-tested approach to residential construction, scaled and refined for homes.
Vita Modular uses a hybrid construction method that combines the best of both worlds — the precision and quality control of off-site factory manufacture with the flexibility and integration of traditional on-site assembly. At the heart of every extension is a structurally graded steel frame with fully insulated wall, floor and roof panels. Because every panel is made to order, your extension is 100% bespoke — any size, configuration or external finish, engineered specifically around your home rather than pulled from a fixed catalogue.
The structure is manufactured under controlled factory conditions to exacting tolerances at our Warwickshire facility, then delivered to your home and assembled into place by our skilled team — tying neatly into your existing building. It's not a sealed "box" dropped on site, and it's not a slow brick-by-brick build: it's a deliberate blend that's faster, superbly insulated, and engineered to perform for decades. No cranes or heavy lifting equipment are required, so we can install in almost any location, even on sites with the most limited access.
We provide the essential accompanying works needed to deliver a complete modular building solution — all carried out as part of our full-package turnkey service.
All accompanying services above are available when instructed alongside one of our extensions.
The same extension, two very different routes. Here's how our hybrid factory-built modular method compares with a traditional on-site build — point by point.
Every home is different — and every build is 100% bespoke. Vita Modular designs and builds single and two storey prefab extensions across the UK's varied housing stock, customised to any shape, size, layout and finish you need — terraces, semis and detached homes alike. We specialise in rear, side, wrap around, side return, two storey and air space modular extensions.
The most popular way to add space — extending into the rear garden to create a larger kitchen, dining or open-plan living area. Often achievable under permitted development, flooding your home with natural light through wide aluminium glazing.
Double the added space without losing more garden. A two storey extension adds a larger kitchen or living area below and a new bedroom, bathroom or home office above — ideal for growing families in semis and detached homes.
Ideal for Victorian and Edwardian terraces, a side return extension fills the awkward alley of unused space alongside the kitchen — transforming a narrow galley into a wide, light-filled family kitchen and diner.
Combining a rear and side return extension into one, a wrap-around dramatically reconfigures the whole ground floor — perfect for growing families who want a generous, open-plan living space.
From your first enquiry to the moment we hand over the keys, our six-step process is designed to be transparent, efficient, and built around a fixed price commitment.
Complete our customer enquiry form for an instant fixed price so we can fully understand your project requirements. One of our dedicated team members will contact you to arrange a design consultation.
Where planning permission is required, our in-house design team prepares and submits all necessary drawings and supporting documentation on your behalf.
8-10 weeksWe'll issue a fully regulated JCT fixed price contract covering our terms and conditions, technical drawings, detailed programme of works, agreed payment plan, and a committed installation date — giving you total cost certainty and peace of mind.
1 weekOur team begins manufacturing at our Warwickshire production facility to hand-craft your modular project, and books in our installation crew for the agreed date.
4 weeksAround a week before the agreed install date we'll confirm any final arrangements. Our installation team arrives on the morning of your install date, ready to build.
4-6 weeksWe complete final snagging and walk you through your new space, providing all completion and compliance certifications — including full building control sign-off — before handing over the keys.
A selection of completed house extension projects from across the UK — each delivered on a fixed price, to a fixed completion date.
A 7m × 4m wrap-around extension creating a bright open-plan kitchen diner, with a new 7-metre structural opening, full groundworks and a silicone render finish. Completed in 6 weeks.
View case study →A 60m² rear house extension and full structural remodel in Dulwich, opening up the ground floor and reconfiguring the layout to create a modern, light-filled living space.
View case study →A 68m² two-storey extension in Dronfield, Sheffield, adding generous accommodation across ground and first floor, built around our structural steel frame system.
View case study →Our interactive map showcases the diverse range of projects we've completed across the UK. Explore the map below to discover Vita Modular installations near you.
Across the UK, well-designed extra living space is one of the most reliable ways to grow what your home is worth — which means every square metre you add can deliver a substantial return.
The cost of moving up the ladder — stamp duty, agent and legal fees, and the price gap to a bigger home — often runs to tens of thousands of pounds before you've gained a single extra room. A well-designed extension adds usable space exactly where you need it, for a fixed, known cost.
Industry analysis suggests a quality extension returns on average £1.50 of added value for every £1 spent, with the strongest returns on side-return extensions to period terraces — the kind found on streets right across the country.
In a high-demand market, more living space remains one of the most dependable ways to grow your home's value — and with Vita Modular's fixed, all-inclusive pricing, you know the full cost before any work begins.
Sources: RICS BCIS & industry ROI estimates. Figures are indicative; actual returns vary by property, specification and local ceiling price.
Indicative on an average UK home (~£300,000) with a £50,000 extension (market estimates, 2026)
Market estimates put a well-designed extension at around £1.50 of added value for every £1 spent. So a £50,000 extension on a £300,000 home typically adds roughly £75,000 of value — taking it to around £375,000 while giving you the extra kitchen, living or bedroom space day to day. Actual figures depend on specification and your street's ceiling price.
Vita Modular delivers bespoke prefab and modular house extensions nationwide. As a leading provider of prefab extensions UK-wide, we manufacture at our Warwickshire facility and install with our own teams, working on projects right across the UK — from our Midlands base out to London, the South, the North and Wales.
Please contact us to arrange a visit to our showroom in Coventry, constructed using the same systems as our extensions and annexes.
Worried about planning? Most homeowners are pleasantly surprised — and we manage the whole process for you either way.
A large share of single-storey rear extensions fall under permitted development rights, meaning full planning permission isn't required — provided the build stays within set size and height limits (generally up to 3m beyond the rear wall for a terraced or semi-detached home, and no more than 4m in height for a single storey).
The main exceptions are conservation areas and Article 4 directions, where permitted development rights are removed and full planning permission is needed. Listed buildings and flats always require consent too, and a two storey or side extension is more likely to need a full application.
Whichever applies to your home, building control approval is required for every extension — and we manage drawings, submissions and approvals on your behalf as part of our service, wherever you are in the UK.
Not sure which applies to you? We'll check your address and advise — at no cost — as part of your free quote.
Everything you need to know about bespoke modular house extensions, installed nationwide.
Often not. Many single storey rear extensions qualify as permitted development, so no full application is needed — as long as you stay within the size and height limits. The main exceptions are conservation areas and Article 4 directions, listed buildings, and flats, which always need consent. Building control approval is required for every extension. We check exactly where your address stands and handle every drawing and submission for you.
Our prefab and modular extensions start from £3,000 per m² inclusive, with prices beginning at £34,000 including VAT — and that figure is genuinely all-in: foundations, the steel frame, external cladding, roofing, glazing, electrics, lighting, flooring and decoration. A 15 m² single-storey extension, for example, starts from £45,000 inc. VAT. Where your project lands depends on its size, finish and any structural work involved. For a tailored figure in minutes, use our instant fixed price quotation generator — and our Price Beat Guarantee means we'll better any genuine like-for-like quote.
From order, we guarantee a four-week lead time. The clever part is that your panels are being built in the factory at the same time as your foundations go in — so once we're on site, assembly is rapid. That's roughly 70% quicker than the brick-and-block route, and far less time living around a building site.
Extra well-designed living space is one of the surest ways to lift a property's worth — and industry data points to roughly £1.50 of value gained for every £1 spent on a quality extension. The biggest gains tend to come from opening up and lighting the ground floor, exactly what a rear or side-return extension does.
It's a hybrid of factory manufacture and traditional on-site assembly. Rather than building wall-by-wall from scratch on site, we manufacture the insulated wall, floor and roof panels around a structural steel frame at our Warwickshire facility, then bring them to your home and assemble them into place — tying into your existing building like a conventional build. You get the precision and consistency of factory production, a warmer and more airtight result, and a fraction of the noise, mess and weather delays of a traditional build.
Far less than a traditional build. The structural part of your extension — the steel frame and insulated wall, floor and roof panels — is manufactured indoors at our factory, so rain, frost and storms never halt that work. With conventional construction, wet trades like bricklaying and plastering grind to a stop in freezing or saturated conditions, and a wet winter can add weeks to a build. Our on-site assembly phase is short by comparison, which keeps weather exposure — and the risk of delays — to a minimum and helps us hold to our guaranteed completion date.
Genuinely bespoke. Every panel is made to order around a structural steel frame, so your extension can be any size, layout, configuration and external finish you want — engineered specifically around your home rather than selected from a fixed catalogue of standard units. The factory method is what makes us fast and precise; it doesn't limit your design.
No — absolutely not. There's a lot of false reporting and misconception online around this, but our modular extensions are treated exactly the same as traditional extensions by lenders, valuers and insurers, because they use all standard construction materials and meet full building regulation standards.
Yes. Our 2 storey modular extension system is the perfect alternative to time-consuming, disruptive traditional builds, adding living space below and bedrooms, bathrooms or a home office above — all 100% tailored to your specification. Please enquire for further information.
Nationwide. Our extensions are manufactured at our Warwickshire facility and installed by our own teams across the whole of the UK. Because our modular system needs no cranes or heavy lifting equipment, we can manoeuvre and install in almost any location, even on sites with very restricted access.
We can offer any additional ancillary building service for your house extension project, including the installation of structural openings, kitchens, bathrooms, underfloor heating, plumbing, electrics, landscaping and demolition works — to name a few. If there's something specific your project needs, just ask us and we'll quote for it as part of your turnkey package.
As standard, our house extension prices are inclusive of VAT, foundations, external walls and finishes, flat roof, painted walls and ceilings, electrics and lighting, flooring and glazing. Exclusions such as demolitions, ground preparation, drainage works, professional fees, statutory approvals and new structural openings can be quoted for separately as required.
Yes. Every customer receives a comprehensive, assignable 10-year warranty on the structural frame of your Vita Modular extension — cover that transfers to a new owner if you sell. Glazing, electrics, trims and all internal finishes are covered by an equivalent 2-year warranty.
Yes — all extension works require building control approval, and our modular system and every one of our works are fully building control compliant. Architect and engineer drawings are needed for the building control submission, and building control fees are itemised separately in your estimate rather than included in our build price. We manage the entire building control process on your behalf from start to finish.
Brick slips and thincoat silicone render come as standard, but we can use almost any exterior finish available on the market to curate your bespoke modular extension. Popular alternatives include brick, redwood timber, metal cladding, a living green wall, composite decking and fibre cement board — so your extension can complement or deliberately contrast with your existing home.
We assess your property's access during the site visit. The nature of our modular system means it can be manoeuvred and installed even where access is very restricted — without the cranes or heavy plant a traditional build often demands — so tight side returns and narrow rear access are rarely a problem.
We don't currently offer finance plans, but we do operate a staged payment plan: a 40% deposit to begin, with the balance spread across the weeks from order to installation, and the final 20% not due until completion and handover. We also accept debit and credit cards (card processing fees apply), which can let you arrange flexible repayment directly with your card provider.
Practical advice on planning, costing and designing your modular house extension, straight from our team.
A clear breakdown of house extension cost per m², what's included in a fixed price, and worked examples by extension type.
Read the guide →PlanningPermitted development, building control and when a prefabricated extension does — and doesn't — need full planning approval.
Read the guide →DesignHow to choose the right modular extension type for your home, layout and budget, with real project examples.
Read the guide →Our steel frame and SIPs system avoids the cement-heavy foundations and high-mass masonry of traditional brick-and-block construction — while achieving U-values of 0.13 (floor & roof) and 0.18 (walls) that comfortably beat new-build minimums. The result is a lighter footprint, and a warmer, cheaper-to-run home.
Versus a like-for-like brick & block extension on concrete strip foundations.
On a typical 40 m² extension — roughly 38,000 km of car travel.
Steel screw piles replace poured concrete strip footings — the single biggest gain.
Comfortably inside Future Homes Standard — cutting heating energy for decades.
Methodology, full embodied-carbon breakdown by element, and sources.
Indicative figures for a 40 m² single-storey extension, modelled from published embodied-carbon values (ICE Database, RIBA, Institution of Structural Engineers, SIPs industry EPD). Real-project carbon varies with site conditions, glazing and specification.
A house extension is just one of the ways Vita Modular can transform your home. Discover our full range of modular building solutions.
No room to extend outward? Build upward instead. Our modular rooftop and airspace extensions add a full new storey or penthouse pod — perfect for tighter terraced plots, with the same fixed price and guaranteed completion date.
Create a fully self-contained granny annexe in your garden — ideal for elderly relatives, adult children, rental income or a dedicated home office. Many of our annexes qualify under the Caravan Act as permitted development, and like our extensions they're built off-site and installed in days.
Vita Modular works with developers, housing associations, landlords and commercial clients on larger-scale modular building projects — from multi-unit airspace developments to commercial extensions and new builds.
Transform your garden into a premium workspace, studio, gym or leisure retreat. Vita Modular garden rooms are precision-built off-site and installed without disrupting your home — fully insulated and ready to use year-round.
Our dedicated installation teams work right across the whole of the UK — bringing the same precision, quality and care to every project.
Book a Free Feasibility CallWe offer a guaranteed £750 for every successful referral. If someone you point our way goes ahead with their extension, that's £750 in your pocket — simple as that.
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