The Cheshire Golden Triangle — broadly Wilmslow, Alderley Edge and Prestbury, extending toward Knutsford and Hale — contains some of the most expensive residential postcodes in England outside London. Detached homes in Wilmslow average in the region of £888,000, while SK9 detached property in Alderley Edge routinely transacts between £1.5m and £3m.
That matters for one simple reason: where the ceiling price on your street is high, well-designed additional floor area converts into value more efficiently than almost anywhere else in the county. The constraint here is rarely budget or plot size — it is planning. Much of the area sits within the Green Belt, where extensions must not be disproportionate to the original dwelling, and Cheshire East operates 76 conservation areas, nine of which fall across Wilmslow, Alderley Edge and Knutsford.
Every Vita Modular extension is 100% bespoke and engineered around your property, your plot and the specific policy that applies to your address. We combine off-site precision with a proper integrated on-site build, which means a shorter, cleaner programme on a prestige street — with a fixed all-inclusive price and a 10-year structural warranty.
These are large homes on good plots in a market where buyers pay for space and specification. The opportunity is real — but so is the policy framework, and getting the design right for Green Belt and conservation area constraints is what separates an approval from a refusal.
High ceiling prices reward added space. With Wilmslow detached homes averaging around £888,000 and Alderley Edge SK9 detached property regularly trading between £1.5m and £3m, the value uplift on a well-executed extension is materially higher here than in most of Cheshire. An extra reception room, a principal suite or a genuinely impressive kitchen-living space all trade strongly in this market.
Moving costs are punishing at this level. Stamp duty on a £1.5m purchase runs well into six figures before agent and legal fees. Against that, a fixed-price extension that delivers the same additional accommodation — while keeping you in the same school catchment and the same street — is often the clearly rational choice.
The plots suit ambitious schemes. Detached homes on generous gardens with side access mean two-storey extensions, wrap-arounds and substantial rear additions are all genuinely feasible here, rather than being ruled out by site constraints as they often are in terraced towns.
Green Belt is the defining constraint. Large parts of Wilmslow and Alderley Edge lie within the Green Belt, where an extension must not be disproportionate to the original dwelling — that is, the house as first built or as it stood in 1948, not as it stands today after previous owners' additions. Understanding how much of that allowance has already been used is essential before a design is drawn, and it is one of the first things we establish.
Conservation areas across both towns. Cheshire East maintains 76 conservation areas — more than almost any other North West authority — including Fulshaw Park and Styal in Wilmslow and Trafford Road in Alderley Edge. Inside a conservation area, side extensions and dormers are not permitted development, and full planning permission is required.
Specification expectations are high. This market notices detailing. Because every build is bespoke, we match brick, render, stone, timber and glazing precisely, and can deliver the large-format glazing, flush thresholds and considered proportions that buyers in SK9 and SK10 expect as standard.
Wilmslow and Alderley Edge both fall under Cheshire East Council. Two policy layers dominate here — Green Belt proportionality and conservation area designation — and they frequently apply to the same property.
Where your property is washed over by Green Belt, national policy treats most new building as inappropriate development — but makes an explicit exception for the extension or alteration of an existing building, provided it does not result in disproportionate additions over and above the size of the original building.
The critical word is original. The baseline is the dwelling as first built, or as it stood on 1 July 1948 for older property — not its current footprint. If previous owners have already extended, some of the allowance may be spent. Cheshire East assesses proportionality on volume and floor area as well as visual impact on openness, and we establish that baseline from planning history before designing, so the scheme is shaped to what policy will actually support.
Cheshire East has 76 conservation areas and 2,517 listed buildings, 46 of them Grade I. Nine of those conservation areas sit across Alderley Edge, Wilmslow and Knutsford — including Fulshaw Park and Styal in Wilmslow and Trafford Road in Alderley Edge.
Inside a conservation area boundary, national rules mean side extensions are not permitted development and loft conversions and dormers are not permitted development — planning permission is required for both. Rear extensions face tighter limits, and cladding and some external alterations also require consent.
Cheshire East has seven Article 4 directions, including eight area-wide Article 4(2) directions and a small number of single-property directions. You will find sources online stating that Alderley Edge has an area-wide Article 4 direction; the council's conservation area management plan proposed one, but as at 2026 it had not been made. Because status changes and boundaries follow individual properties rather than town names, we confirm your specific address with Cheshire East rather than working from a general map.
Detached property means the Party Wall etc. Act is less often triggered here than in terraced towns, but it still applies where an extension is built within 3m or 6m of an adjoining owner's structure or foundations — which is common on closer-set plots in Handforth and central Wilmslow. Building control approval is required for every extension regardless of planning route, and we manage both processes for you.
We check your address against Cheshire East's Green Belt boundary, conservation area maps, Article 4 register and listed building records — and pull the property's planning history to establish the original-dwelling baseline — before any design work begins. Planning, building control and party wall are then managed end-to-end.
From Victorian villas on the Edge to inter-war semis in Handforth and 1960s–1990s detached homes across Dean Row and Lacey Green, the Triangle's housing is varied — and every build is engineered around the specific property.
Large detached homes — Alderley Edge, Fulshaw Park, Prestbury. Substantial houses on mature plots, often already extended at some point in their history. These suit generous two-storey rear or side additions, garden-facing kitchen-living spaces and principal suites above — subject to the Green Belt proportionality test where it applies, which is why establishing the original footprint comes first.
Victorian and Edwardian villas. Period property with high ceilings, deep plans and strong street presence, frequently within or adjoining a conservation area. The work here is design-led: a contemporary rear extension that sits deferentially behind a retained period frontage is usually the approach that satisfies both the planners and the market.
Inter-war and post-war semis — Handforth, Dean Row, Lacey Green. The more accessible end of the Triangle, with side access and reasonable plots. These are among the most cost-effective properties to extend in the area, and often sit outside both conservation areas and the tightest Green Belt constraints — making wrap-arounds and two-storey side extensions very achievable.
Modern detached and executive housing. Later 20th-century and recent detached homes across the Wilmslow fringe extend efficiently, with straightforward construction and fewer heritage constraints. The usual brief here is a larger open-plan kitchen-family space with full-width glazing, and often a home office or annexe-style ground-floor suite.
Our extensions start from £3,000 per m² all-in — VAT, foundations, frame, external walls, roof, glazing, electrics, flooring and decoration — from £34,000 inc. VAT. Local traditional builders typically quote £3,500–£3,800 per m² and up on a like-for-like basis, and specification expectations in this market push that higher still.
Specification drives the number here. Golden Triangle projects rarely stop at the standard specification: large-format sliding glazing, structural openings across the full rear elevation, underfloor heating, high-grade kitchens and landscaping are the norm rather than the exception. We quote these as clearly itemised additions to the fixed base price rather than leaving them to emerge as variations.
Planning adds time, not necessarily build cost. A Green Belt or conservation area application extends the programme before work starts, and may require heritage or design-and-access documentation. The build itself is not inherently more expensive — but matched materials on a conservation-area frontage can be.
The return is the strongest in Cheshire. Industry analysis puts a quality extension at around £1.50 of value gained per £1 spent. On a street where detached homes run from £888,000 in Wilmslow to £1.5m–£3m in Alderley Edge, the practical ceiling is high enough that well-designed space is rarely over-capitalised — though we will tell you honestly if we think a scheme is pushing past what the street will carry.
Fixed price, staged payments. Your price is agreed up front and covers the standard specification in full. We operate a staged payment plan — 40% deposit, balance spread across the programme, final 20% not due until completion and handover.
Wilmslow, Alderley Edge and the surrounding SK9 and SK10 villages, plus the Cheshire East fringe toward Prestbury and Macclesfield.
We also build across the wider Cheshire East area and into south Manchester — Bowdon, Hale, Altrincham and Bramhall — and throughout the rest of Cheshire.
Green Belt, conservation areas, cost and value — the questions Golden Triangle homeowners ask most.
Yes. National Green Belt policy makes an explicit exception for extending an existing dwelling, provided the result is not a disproportionate addition over and above the size of the original building. The key point is that "original" means the house as first built, or as it stood on 1 July 1948 for older property — not its current size. If previous owners have extended, part of that allowance may already be used. We pull your property's planning history to establish the baseline before designing, so the scheme is sized to what Cheshire East will actually support.
Cheshire East has 76 conservation areas in total, nine of which sit across Alderley Edge, Wilmslow and Knutsford — including Fulshaw Park and Styal in Wilmslow and Trafford Road in Alderley Edge. Boundaries follow individual properties rather than whole towns, so two houses on the same road can differ. We confirm your specific address against the council's definitive boundary maps before any design work.
As at 2026, there is no area-wide Article 4 direction in force for Alderley Edge, despite some sources stating otherwise. The Alderley Edge Conservation Area Management Plan proposed one, and Cheshire East has resolved in principle, but it had not been made. Cheshire East does operate eight area-wide Article 4(2) directions elsewhere in the borough, plus a small number of single-property directions. Because status changes, we verify your address with the council directly rather than relying on published summaries.
Yes. Inside a conservation area, side extensions are not permitted development under the national rules, so full planning permission is required. The same applies to loft conversions and dormers. Rear extensions face tighter size limits than elsewhere, and some external alterations and cladding also need consent. Genuine repairs and like-for-like replacement are not affected — it is change that requires permission.
Ours start from £3,000 per m² all-inclusive, with prices from £34,000 inc. VAT covering foundations, frame, external finishes, roof, glazing, electrics, flooring and decoration. Traditional builders locally typically quote £3,500–£3,800 per m² and up on a like-for-like basis. In practice, Golden Triangle projects often specify above standard — large-format glazing, full-width structural openings, underfloor heating — and we itemise those clearly rather than leaving them as later variations.
Typically yes, and more efficiently than in most of Cheshire. Industry analysis suggests around £1.50 of value gained per £1 spent on a quality extension. With Wilmslow detached homes averaging around £888,000 and Alderley Edge SK9 detached property trading between £1.5m and £3m, the ceiling on most streets is high enough that good additional space is rarely over-capitalised. That said, value depends on your specific street's ceiling — and we will say so if a scheme looks like it is pushing beyond it.
Yes. Two storey extensions are one of the most common briefs in this area — reception or kitchen space below, bedroom suite, bathroom or home office above. They almost always require full planning permission, and in the Green Belt they engage the proportionality test directly, so the design is shaped around that from the outset.
The build programme itself is fast, because much of the extension is prepared off-site while foundations go in. Planning is the longer variable: a straightforward application runs to the statutory determination period, while Green Belt, conservation area or listed schemes need longer for heritage documentation and consultation. We give you a realistic programme covering both at the outset rather than quoting build time alone.
Explore other extension types and nearby Cheshire towns we build in.
Costs, planning and design for kitchen & wrap-around extensions across Cheshire.
Read more →Costs, planning and design for two-storey extensions across Cheshire.
Read more →Costs, planning and design for single-storey extensions across Cheshire.
Read more →The full county guide — costs, planning across all four authorities and ROI.
Read more →Please kindly note that our minimum order value for a typical 3m x 3m (9 SQ/M) size modular extension is £30,000 inclusive.
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