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Plan your extension with confidence

Architectural drawings, planning support and vetted builder introductions all in one place.

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Loft extension

UK's #1

Architect on Trustpilot

11,000+

Projects nationwide

92%

Planning approval rate
Real homes. Real results.

Wraparound extension, Winchester

Planning approval secured on first submission.

Resi also helped us navigate obtaining planning permission really smoothly... it flew through planning in under seven weeks.

- Sarah & Tom

Why Resi?

Everything coordinated in one place

An extension involves more than drawings. It requires planning strategy, approvals, compliance and the right build team.

Resi coordinates the entire process in one place, saving time and helping you move forward with confidence.

How it works

We've streamlined the architectural process

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.

1. Measured survey

We capture precise measurements using 3D scanning to create a digital model of your home.

2. Proposed Design

Work with your designer to shape your extension and review layouts in 3D.

3. Planning Support

We manage your application and liaise with the local authority on your behalf.

4. Building Regulations

We prepare a compliant technical drawing package and coordinate required specialists.

5. Find a Builder

Receive introductions and build cost estimates from vetted builders.

In partnership with

Extensions designed with daylight in mind.

We consider roof window placement from the very first design stage to maximise how natural light flows through your space, ensuring brighter, more open layouts from the outset.

Roof window placement considered from day one
Maximise natural light throughout your extension
Add long-term value to your home

FAQs

Do I need planning permission for my extension?

How much does an extension typically cost?

What happens after I submit a Quick Quote?

Ready to start your extension?

Join over 11,000 homeowners who've extended with Resi.

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10% off design fees. In partnership with