Find the right route for your project
For ground floor extensions only
Express
Faster, more cost-effective extensions designed around the hup! factory-built system, matched with a specialist builder from day one.
For most extension types
Explore
Traditional architectural design for ground floor, two storey and loft projects, with introductions to our vetted builder network.
For complex or multi-element projects
Elevate
In-depth design with hands-on coordination, site visits and early collaboration across your builder and wider project team.
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
With 11,000+ extensions under our belt
Just have a look for yourself. Chances are we've done a project (or a dozen) close by
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 92% 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.
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.
Speak to an expert
We’re always up for 30 minute phone consultations to help you with your project.
Copyright © 2022 Resi Design Ltd.
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.