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We’re the UK’s #1 extension architects

Sort your home extension in one place, with best-in-class architectural drawings, planning support and intros to vetted builders.

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Rear Extensions
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Extend easy

Sort your home extension in one place, with best-in-class architectural drawings, planning support and intros to vetted builders.

Get an instant design quote Configure your own extension Advice for early researchers Go straight to the builder
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All our case studies

We’re Britain’s #1 architectural practice for all-things extending

Be cost efficient on designs + planning support

Get your project sorted without the headaches

Unlock expert guidance from ex-planning officers

Organise your entire project online

Specialising in really nice designs

More designs

With 9,000+ extensions under our belt

Just have a look for yourself. Chances are we've done a project (or a dozen) close by

Ground floor rear Merton · Terrace · 2023
Ground floor rear Merton · Terrace · 2024
Ground floor rear Lambeth · Terrace · 2024
Ground floor rear Lambeth · Terrace · 2023
Ground floor rear Lambeth · Terrace · 2022
Loft main dormer and ground floor rear Croydon · Terrace · 2024
Ground floor rear Croydon · Terrace · 2023
Ground floor rear and garden annex Merton · Terrace · 2022
Loft main dormer Merton · Terrace · 2022
Loft main dormer and ground floor rear Croydon · Terrace · 2024
Ground floor rear Merton · Terrace · 2024
Ground floor rear Merton · Terrace · 2022
Ground floor rear Lambeth · Terrace · 2024
Ground floor rear and internal alterations Croydon · Terrace · 2024
Ground floor rear and internal alterations Wandsworth · Terrace · 2023
Ground floor rear and internal alterations Merton · Semi Detached · 2022
Loft L shaped dormer and ground floor wraparound Wandsworth · Terrace · 2023
Loft L shaped dormer Lambeth · Terrace · 2024
Ground floor side infill and internal alterations Lambeth · Detached · 2023
Loft L shaped dormer and ground floor wraparound Merton · Semi Detached · 2023
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We’ve streamlined the architectural process

You’re busy and you live in Britain – the last thing you want is endless days off work having meandering in-person conversations over pencil-drawn floor plans.

We visit once, quickly, to create a true-to-life digital scan of your property. After that, everything is handled online and on the phone with a minimum of fuss, so you can extend easy.

 

We have a 90% planning approval rating

Having rescued a team of ex-local authority officers from across the country, our planning team know the planning permission playbooks inside and out. This gives your project the greatest chance of getting the council’s green light, so you can enjoy your new home sooner.

 

And a network of vetted builders to pick from

Our Connect service helps you find the right contractors to make your designs a reality. There’s no additional cost, and we’ll sit down with you to go through your project’s tenders and find the most suitable company to fulfil your build.

Learn more
 

Already got a design in mind?

You don’t have to go through the whole process with an architect if you know what you want right now. With our with our online configurator, you can recreate the home extension in your head in under a minute, saving time and money in the process.

Let’s have a play

Cream of the crop

We've got more 5 star reviews than anyone else, by a country mile. That's why we're rated No. 1 in the Architect category on Trustpilot.

The team at Resi have been so unbelievably help...

The team at Resi have been so unbelievably help...

Annie • NW7

Custom Custom

took all the work and kept me in touch…

took all the work and kept me in touch all the ...

Roger • NW5

Ground floor Internal alteration

I found Resi personnel very helpful

I found Resi personnel very helpful. Their meth...

Jacqueline • CM3

Ground floor Rear

Resi have been amazing from the start

Resi have been amazing from the start, the comm...

Obi • BR5

Garden Annex

It is a 10 from me! :)

It is a 10 from me! :) I found Resi through onl...

Yiming • W14

Custom Custom

Working with Resi has been such a pleasure from...

Working with Resi has been such a pleasure from...

Saqib • SL6

Ground floor Wraparound

Outstanding Service

Shabnam from the Resi finance team is exception...

Joie • MK10

Ground floor Rear

Our experience with Resi

Our experience with Resi was one of the best cu...

Abu • DA8

Loft Hip to gable with main dormer

Excellent

Really good and easy to use online platform

Richard • TW11

Ground floor Wraparound

Delighted home owner

Fantastic service would highly recommend this e...

Lyn • BR6

Ground floor Rear

Really good service,

Really good service, we dealt with multiple at ...

Nick • NW10

Loft Main dormer

Excellent, friendly service

Jack at Resi was brilliant at bringing together...

Oliver • W4

Ground floor Wraparound

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We’re always up for 30 minute phone consultations to help you with your project.

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Advice centre FAQs How much does a side return extension cost? A guide to permitted development rights in 2025 House extension without planning permission: what are the rules? House extensions: everything a homeowner needs to know Loft Conversion Costs UK 2025: A Complete Guide to Budgeting Your Build

Resources

Advice centre FAQs How much does a side return extension cost? A guide to permitted development rights in 2025 House extension without planning permission: what are the rules? House extensions: everything a homeowner needs to know Loft Conversion Costs UK 2025: A Complete Guide to Budgeting Your Build

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Resi Design Ltd. trading as 'Resi' | Company No: 10471125

We are proud to employ architects registered with the Architects Registration Board and were awarded the mark for The Mayor's Good Work Standard for fair pay & conditions, wellbeing, skills, progression, diversity and recruitment.

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