Design & build · Groundworks · Drainage · Structural engineering across South West London & Surrey

AMTA ARGC · House Extensions

House Extensions in London

Rear, side return, wraparound and double storey extensions, designed, engineered and built by one team.

Single storey rear extension with full-height glazing and timber cladding at dusk

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Single storey rear extension with full-height glazing and timber cladding at dusk

Overview

House Extensions: designed, engineered and built in-house

Our house extensions in London are designed by our own engineers and built by our own site team. We handle the drawings, structural calculations, planning or permitted development checks and building control, then build the extension from groundworks to final finishes.

We cover 9 councils across South West London and Surrey, and every project is run by one team from survey to sign-off. It is often combined with groundworks and structural & architectural engineering.

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What is included

What is included in our house extensions service

01

Survey and brief

We measure the house, check the ground and talk through layout, budget and timescales.

02

Drawings and calculations

Architectural drawings and structural calculations prepared in-house.

03

Approvals

Planning or permitted development, building regulations and party wall notices where needed.

04

Build and handover

Foundations, drainage, structure, roof, glazing and finishes, then building control sign-off.

How we work

From first survey to building control sign-off

One team, one point of contact and one programme, from the first site visit to the completion certificate.

01

Survey

We visit, measure up and agree the brief, budget and timescales.

02

Design

Drawings and structural calculations by our own engineers.

03

Planning & building control

Planning or permitted development, building regulations and party wall help.

04

Build

Our site team builds, with one contact throughout.

05

Sign-off

Final inspections, completion certificate and handover.

Types

Types of house extensions

Recent projects

Recent projects

Costs and timescales

House Extensions costs and timescales

Every project is priced after a survey, because ground conditions, structure and finishes vary from house to house. We give you an itemised quote and a written programme, so you know what you are paying for and when each stage happens.

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What affects the price

Areas we cover

Areas we cover for house extensions

We work across nine councils in South West London and Surrey. Choose your area to see local projects, planning notes and how we work there.

Richmond, Twickenham, Teddington, Barnes, Kew

Kingston, Surbiton, New Malden, Tolworth

Wimbledon, Merton Park, Raynes Park, Morden, Mitcham

Tooting, Balham, Wandsworth, Putney, Earlsfield

Epsom, Ewell, Stoneleigh

Hounslow, Chiswick, Isleworth, Brentford

Ealing, Acton, Southall, Hanwell

Dulwich, Peckham, Camberwell, Bermondsey

Croydon, Purley, Coulsdon, South Croydon

Related services

Related services

FAQs

House Extensions FAQs

Straight answers to common questions. See all our FAQs or ask an engineer.

Many single storey rear extensions fall under permitted development, but it depends on size, property type and conservation area status. We check this at the survey.

Usually yes. We keep the existing house weather-tight and plan the noisy work so you can live at home for most of the project.

It depends on size and approvals. We give you a written programme with your quote covering design, approvals and each build stage.

Richmond, Kingston, Merton, Wandsworth, Epsom & Ewell, Hounslow, Ealing, Southwark and Croydon.

Free, no-obligation quote

Get a free quote for house extensions

Send a few details and one of our engineers will call you back to arrange a survey. Prefer to talk now? Call 020 3857 3805.