Rear Extensions in London
Transforming period terraces and semis with rear extensions that flood ground floors with natural light and connect homes to the garden.
About This Service
Rear Extensions in London
A rear extension is one of the most effective ways to add space and value to a London home. By extending into the back garden, you can create a spacious open plan kitchen-diner, bring natural light deep into the ground floor, and establish a seamless connection between inside and outside.
More Space has designed rear extensions across every London borough, from Victorian terraces in Southwark to Edwardian semis in Wandsworth. We specialise in minimalist glass and steel structures that sit respectfully behind period facades — contemporary additions that enhance rather than compete with the original architecture.
Every rear extension we design is tailored to the property, the site, and the way you live. Whether you're planning a single storey side infill, a full-width rear extension with bi-fold doors, or a double-height addition, our team brings the design expertise and local planning knowledge to deliver a space that's both beautiful and compliant.
Key Benefits
Why Choose a Rear Extension
Open Plan Living
Create a spacious kitchen-diner that becomes the heart of your home — a sociable space for cooking, eating, and entertaining.
Garden Connection
Full-width bi-fold or sliding doors dissolve the threshold between inside and out, bringing your garden into your living space.
Natural Light
Rooflights, vaulted ceilings, and full-height glazing flood previously dark ground floors with daylight throughout the day.
Property Value
A well-designed rear extension can add 10–15% to your property's value, making it one of the most worthwhile investments.
How We Work
Our Rear Extension Process
Initial consultation and site survey to understand your vision, budget, and site constraints
Concept design exploring layout, glazing, and roof options tailored to your property
Planning application with design and access statement, managed through to approval
Technical drawings and building regulations approval with structural calculations
Construction with project management, quality control, and regular client updates
Recent Projects
Rear Extensions We've Delivered
Common Questions
Rear Extensions FAQs
Do I need planning permission for a rear extension?
Many single storey rear extensions can be built under permitted development rights, which don't require full planning permission. However, if your property is in a conservation area, is listed, or the extension exceeds permitted development limits, you'll need planning permission. We assess this at your initial consultation and can apply for a lawful development certificate for certainty.
How much does a rear extension cost in London?
Rear extension costs in London typically range from £2,500 to £4,000 per square metre, depending on specification, glazing, and finishes. A typical single storey rear extension of 20–30 m² costs between £60,000 and £120,000. We provide detailed cost estimates at the concept design stage.
How long does a rear extension take?
From design to completion, a rear extension typically takes 6–9 months. Design and planning take 3–4 months, and construction takes 12–20 weeks depending on size and complexity. We provide a detailed programme at the outset of your project.
Can I live in my home during construction?
In most cases, yes — though the kitchen is usually unusable for several weeks. We recommend setting up a temporary kitchen and can advise on temporary accommodation options for particularly disruptive phases. We work to minimise disruption and keep your home as liveable as possible throughout.
Instant Estimate
Design & Drawings Cost Estimator
Get a baseline price guide for your design and drawings package in seconds. Select your options below for an indicative budget range.
Project Type
Approximate Size
25 m²Design & Drawings
Indicative design & drawings fee
This is an indicative guide based on typical London design fees. Your actual quote will depend on site conditions, planning requirements, and project scope.
Book a Consultation
Start Your Rear Extensions Project
Book your initial consultation. We'll visit your property, discuss your vision, and provide a clear pathway to making your rear extensions a reality.