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Project CalculatorBuild it on screen and see the moment you cross a line in the rules.Street CheckWhat your neighbours got approved, and what that means for you.Feasibility sketchSend a photo of your house, get a concept drawn over it.Cost calculatorHonest price ranges by project type and region.

Most used Try the Project CalculatorDrag a slider and watch the drawing turn amber the moment you leave permitted development. No email needed. Open the Project Calculator →

Find your councilApproval rates and local rules, council by council.London boroughsAll 33, with Article 4 coverage.Article 4 directionsWhere permitted development is switched off.How long it takesThe eight weeks, and the truth.

Most used Try the Project CalculatorDrag a slider and watch the drawing turn amber the moment you leave permitted development. No email needed. Open the Project Calculator →

Permitted developmentWhat you can build without asking.Refused? What nextAppeal or resubmit, and how long each takes.Party wall agreementsWhen you need one and what it costs.Building regs vs planningTwo approvals, two risks.All guidesThe full library.

Most used Try the Project CalculatorDrag a slider and watch the drawing turn amber the moment you leave permitted development. No email needed. Open the Project Calculator →

Rear extensionThe most common project in the UK.Loft conversionThe cheapest bedroom you can add.Side returnThe alley beside a terrace, brought inside.Two storeyBetter value per square metre.WraparoundSide and rear combined.All project costsEvery type, side by side.

Most used Try the Project CalculatorDrag a slider and watch the drawing turn amber the moment you leave permitted development. No email needed. Open the Project Calculator →

Free tools

Tools nobody else gives away

Every practice will tell you what is possible once you have paid them. These answer the question first, for nothing, so you can decide whether the project is worth having at all.

Project Calculator

Set your house type and drag the depth. The drawing turns amber the moment you cross a line in the rules, and every finding cites the clause it comes from.

Open it →Next working day

Street Check

Type a postcode and we send back what your council has actually approved nearby, with an honest cost band for the size you are considering.

Open it →2 working days, free

Feasibility sketch

Upload a photo of your house and tell us what you want from it. You get back a concept drawn over your own home.

Project Calculator

Start with the one that answers both questions.

Planning verdict and cost, in one place, in 60 seconds. The other tools go deeper once you know where you stand.

Open the Project Calculator 60 seconds

Start anywhere

Twenty minutes with the team that sweats the details.

No obligation, no script. An honest read on what your house can do, from people who obsess over getting it approved.

Twenty minutes, by phone or video, whenever suits
Anywhere in the UK, whatever your council
You leave knowing what is possible, and roughly what it costs

Book your free call

Tell us where to reach you and we will confirm a time.

What are you thinking of?

We confirm by email within one working day. No sales calls, ever. How we use your details.

That is booked in.

We will email you within one working day with a time.