Modular House Extension - Sutton

Project Overview

Sutton Borough Council required a timely and efficient extension for a property in Carshalton. Vita Modular delivered a bespoke modular solution, providing a complete turnkey service from foundation to final finishes. The project showcased the speed and convenience of modular construction, with a structural steel system and modern render finish, all completed within a condensed timeframe to meet the council's needs.

Type:
Home Extension
size:
14.3 SQ/M
Use:
Living Space
PROJECT VALUE:
49,000
DURATION:
30 days
location:
Sutton, Surrey

HOW WE DID IT

For a property located in Carshalton, Sutton Borough Council identified the need for a compact extension. The primary challenge was to deliver the project with minimal disruption and on an accelerated timeline. Vita Modular was selected to provide a solution that bypassed the lengthy process of traditional construction.

The design centred around a 14.3 SQ/M modular unit built on a robust structural steel sub-frame. This off-site construction method significantly reduced on-site activity and allowed for a lead time of just 4-6 weeks. The foundation system chosen was galvanised steel ground screws, a method that is not only fast to install but also minimises groundwork and environmental impact.

The extension was finished externally with a modern silicon render system to seamlessly blend with the existing property. Internally, the space was completed with plasterboard walls and ceilings, standard flooring, and a comprehensive electrical package, making it ready for immediate use upon completion of the short 2-3 week installation period.

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All-Inclusive Service

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Comprehensive Warranty

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High Quality Finish

  • Rapid Delivery: A short lead time of just 4-6 weeks from enquiry to delivery.
  • Efficient Installation: The complete on-site installation was finished in just 2-3 weeks.
  • Minimal Disruption: A galvanised steel ground screw foundation system was used, avoiding the need for extensive concrete foundations.
  • Turnkey Electrical Package: Included 6 double sockets, 8 LED downlights, an electric panel radiator, and external lighting.
  • Durable, Modern Finish: The exterior was clad in a high-quality, low-maintenance silicon render system.
  • All-Inclusive Service: The estimate covered all aspects from foundations and drainage connection to internal painting and flooring.

Before & After

Before
After

Technical Drawings

Watch the video testimonial with the client:

How much does a house extension in Sutton, Surrey cost?
This bespoke extension in Sutton, Surrey came in at £49,000, covering groundworks and foundations, the structural steel frame, external cladding, roofing, a full internal fit-out, electrics and flooring. Every Vita Modular project is individually priced against survey and specification.

How long does a modular extension take to build?
This project ran for 30 days on site from structural works through to handover. Because the steel frame is engineered and largely prefabricated off-site, that is significantly less time on site than a traditional brick-and-block extension of the same scope.

Do I need planning permission for an extension in Sutton, Surrey?
Many single-storey rear extensions fall under Permitted Development, depending on the size, the property and local authority rules. Vita Modular prepares the technical building-control drawings and manages the building-control process to completion; planning applications and party-wall matters are handled separately.

Is a Vita Modular extension as strong as a traditional brick build?
Yes. Our extensions are built on an engineered structural steel frame rather than timber or masonry. Every frame is calculated by a structural engineer, installed on proper foundations, and certified through an independent building-control process to completion.

What is included in the fixed price?
The fixed-price contract covers foundations, the engineered steel frame, external walls and cladding, the roof, painted walls and ceilings, electrics and lighting, LVT flooring, and Vita Modular’s design fee and building-control management — with no hidden extras.

benefits

Our modular buildings are designed, engineered and built to perfection

10 Year Warranty

We’re so confident in the longevity and performance of our structural steel frame modular buildings that we offer an industry-leading 10 year guarantee as standard.

Lead time

We are proud to offer an industry-leading guaranteed 6 week lead time from the date of order.

Bespoke

Our distinctive range of exterior cladding finishes and architectural embellishments is quite simply unparalleled. There are no limits to the space we can create for you.

One Price; No Hidden Extras

Our price includes everything from delivery, installation, foundations, doors & windows, painted walls, electrics, lighting and flooring, to name just a few.

Built to UK Building Regulations

Our modular buildings comply with all aspects of current UK building regulations, so you not only have complete peace of mind that your extension is built to last but you also have a space that can be comfortably used all year round.

Designed & Built in the UK

We use the most advanced modular construction technology to precision craft every modular building at our Warwickshire production facility.

Our Turnkey Process

How our Design & Build Process Works

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.

Step 01

Enquiry

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.

2 weeks
Step 02

Planning & Design

Where planning permission is required, our in-house design team prepares and submits all necessary drawings and supporting documentation on your behalf.

12 weeks
Step 03

Contract

We'll issue a fully regulated JCT fixed price contract covering our terms and conditions, technical drawings, agreed payment plan, and a committed installation date — giving you total cost certainty and peace of mind.

1 week
Step 04

Manufacture

Our 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 weeks
Step 05

Installation

Around 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.

6 weeks avg
Step 06

Handover

We 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.

Ready to start? Get your instant fixed price today.

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