Stop guessing. Get instant data on planning constraints, permitted development rules, and local precedents for any London property — no architect drawings needed.
Enter your postcode to find your property, then select it from the list.
Search by address instead.
Planning is opaque. We make it transparent.
Most homeowners spend £1,000+ on architect drawings before finding out their project can't be built — or didn't even need permission in the first place. CanUBuild gives you the answer first.
Before
❌ Paying for drawings before knowing if a project is viable
Before
❌ Calling the council and waiting weeks for a pre-application response
Before
❌ Not knowing if your property is in a conservation area or flood zone
With CanUBuild
✅ Instant feasibility in 60 seconds — before spending a penny on professionals
With CanUBuild
✅ Real PD rules engine and local precedent data, available 24/7
With CanUBuild
✅ Five constraint types checked automatically at address level
A junior planning consultant, powered by data
Three steps from address to answer. No sign-up required to start.
Enter any London postcode or address. We resolve it to the exact property via the Ordnance Survey, identify your planning authority, and pull all relevant constraints.
Select your project type and answer a few plain-English questions about size and scope. Our rules engine evaluates permitted development rights and local policies instantly.
Receive a clear feasibility verdict, a map of your constraints, nearby comparable decisions, and an approval likelihood score. Download a PDF to share with your team.
What you get in every check
Instantly checks your property against conservation areas, listed buildings, Article 4 directions, flood risk zones, and tree preservation orders — all on a single interactive map.
Our rules engine evaluates your project against national PD rights and any local restrictions, telling you whether you likely need planning permission or can proceed without it.
We surface comparable planning applications approved or refused near your address, with an approval likelihood score based on real outcomes from your local planning authority.
Download a polished report you can share with your architect, builder, or mortgage lender — covering constraints, PD assessment, and local precedents in a clear format.
Powered by the Ordnance Survey Places API for precise property matching, not just postcode centroids. Your UPRN is resolved so constraints are checked at the right location.
Get a meaningful feasibility answer in under a minute without paying for architect drawings upfront. Know if a project is viable before you spend a penny on professionals.
Constraints checked on every report
We cover the most common London householder projects with deep analysis for both Permitted Development and full planning permission routes.
Built on authoritative public data sources
These are the questions homeowners usually ask before speaking to an architect, planning consultant, or builder.
It depends on the depth, height, materials, and whether the property has restrictions such as conservation area status, Article 4 directions, or listed building controls. Many rear extensions can fall under permitted development, but local constraints can change the answer.
Some loft conversions are possible under permitted development, but dormers, roof height changes, front-facing alterations, and restrictions on the property can push a project into full planning permission territory.
These designations can remove or limit permitted development rights and make seemingly simple home improvements subject to tighter design controls, listed building consent, or full planning permission.
CanUBuild checks address-level planning constraints, permitted development rules, nearby approvals and refusals, and local planning authority context so you can understand feasibility before paying for drawings or specialist advice.
Get a data-driven planning feasibility answer in under a minute. No drawings, no waiting, no upfront cost.
No drawings needed · No sign-up required to start