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See your extension before you spend a penny on it.

A rough cost and a permitted-development read, in about three minutes. No account needed.

Detached · 4.0 × 2.7 m rear Likely PD
Project setup

Where's the project?

Planning check

Tell us about your house

Planning check

What kind of work?

Pick at least one, we need this to check what's permitted and estimate cost.
Planning check

Rough dimensions

Planning check

Boundary distances

Your result
Documents you'll likely need
Simplified guidance only, based on the answers you've given. Not a legal ruling. Confirm with your local planning authority before starting work.
Project setup

Structure & features

Project setup

What's included?

Only the tasks relevant to what you're actually doing show up in your checklist. You can always add your own tasks later.

Project setup

Garden & landscaping

Project setup

Rooms & finishes

Project setup

Estimated cost so far

Project setup

Contingency

Pre-filled at 15%, the middle of the 10-20% range standard UK renovation advice recommends setting aside. It's a starting point, not a fixed answer: adjust it for your own risk (an older house or a listed building generally wants more, a straightforward new-build extension can often get away with less).

Project setup

DIY or trade?

We've already set sensible DIY/trade defaults per task. This just lets you flip them all at once. You can still change any task individually later.

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Estimated figures are rough guides from typical UK trade rates, not quotes. Get quotes from tradespeople before committing to a budget.

Permitted development

Simplified guidance only, based on the answers you've given. Not a legal ruling. Confirm with your local planning authority before starting work.

Party Wall Neighbours

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Documents

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