Extnd is the design and planning team UK homeowners rate highest. Feasibility, drawings, planning, building regs. The build is yours; everything before it is ours.
Pick your house, shape the extension, and watch the drawing turn green, amber or red as you cross the rules. Then enter your email to see your verdict and cost.
Every project type, plus the professional fees that turn up on the invoice after you have already said yes.
A few of the homes we have taken from first sketch to approved drawings, from city terraces to village cottages.
About these images. Some are AI visualisations rather than photographs, generated from the real drawings and marked as such. The dimensions, planning routes and timescales shown alongside them are the actual project figures.
Both take minutes. Both end with something real in your inbox, wherever in the UK you are, before you have spent a pound.
Type a postcode and drag the depth. You get the realistic size, an honest cost band and what your council has actually approved nearby, sent within one working day.
Upload a photo of your house and tell us what you want from it. You get back a concept of what it could become, drawn over your own home. No strings, genuinely free.
We read council decisions across the country so your design starts where approval already lives. Hover any area.
The same journey every project follows, with what happens in each stage and how long it really takes. Scroll to move through it.
The research other practices keep behind a first meeting. Take one, or take both.
Both PDFs in one email. One useful email a month after that, unsubscribe any time.
The assistant is not guessing. It reads the same guides, decisions and cost records our designers use.
Every refusal we can find, read and summarised, so you learn from other people's rejections instead of your own. Updated monthly.
What you can build without asking anyone, in normal English.
What twelve recent jobs actually came to, line by line.
How each council behaves, and what they reliably say yes to.
One project, documented week by week from first call to handover.
A photo of the back of your home, and a free concept sketch back.
Numbers first, adjectives second. This is the record we intend to keep.
They told us what the council would say before the council said it. The application went through first time.Homeowner, rear extension
The only firm that showed us numbers and drawings before asking for a penny. That decided it.Homeowner, loft conversion
Test review from the back office.Homeowner, Leeds
Updated regularly. What changed this month, what councils are doing, and what it means for your project.
No obligation, no script. An honest read on what your house can do, from people who obsess over getting it approved.
Tell us where to reach you and we will confirm a time.
We confirm by email within one working day. No sales calls, ever. How we use your details.
We will email you within one working day with a time. If anything changes, just reply to it.
We check what your street and your council have been approving lately.
Rough is fine. It sets the rules we check against.
Drag the depth. The plan, the size and the honest cost band update live.
Your street's recent approvals, your realistic size and your cost band. One email, within one working day.
No spam. One useful email a month at most.Your street report lands within one working day. If you want the answers face to face instead, the first call is free.
One photo from the pavement, straight on if you can. Three quick things and we can start drawing.
What kind of house is it?Pick as many as you like.
Optional. Awkward corners, big dreams, a budget ceiling. It all helps the sketch.
We draw a concept of what your home could become, over your own photo. Genuinely free.
No spam. One useful email a month at most.Your concept sketch lands within two working days. Want to talk it through when it arrives? The first call is free.
Planning permission, permitted development, what things cost, or what your council actually approves.
Guidance, not a lawful development certificate. For your house, use the Project Calculator.
