Landowner tools
Practical calculators for landowners considering housing
Start with rough numbers, then move towards a sensible planning and disposal route. These tools are designed for small sites where serviced plots and self-build routes can unlock more value than a conventional developer sale.
Best starting point
If you only use one tool, start with the land value calculator. It gives a quick comparison of the main routes and points you towards the next most useful tool.
Open calculatorNPPF 2026 Compliance Check
Check your land against the new National Planning Policy Framework and see which routes to permission are open, in plain English.
Start here if you have not looked at your site since the rules changed.
Use toolLand Value Calculator
Compare developer sale, self-build enabler and direct serviced plot routes to estimate what your land could return.
Best first step if you want a quick value range.
Use toolPlot Yield Estimator
Estimate how many serviced plots could fit on a small site once access, layout and open space are allowed for.
Useful before speaking to planners or promoters.
Use toolPlanning Route Finder
Work out whether Permission in Principle, outline planning, full planning or pre-application advice is the right next move.
Built for 1-20 home landowner sites.
Use toolDeal Structure Comparison
Compare selling now, option agreements, promotion agreements and serviced plot delivery using simple financial assumptions.
Good for judging developer approaches.
Use toolClass Q Checker
Check whether your agricultural building qualifies for barn-to-home conversion under Class Q, with the 2024 capacity rules and prior approval risk register.
Built for farmers and barn owners.
Use toolBNG Calculator
Find out if biodiversity net gain applies to your site, the units you'll need to find, and a cost range across on-site, off-site and statutory credit routes.
Instant 10% net gain feasibility check.
Use toolGrey Belt Checker
Answer six guided questions to see whether a small Green Belt parcel could meet the grey belt definition in the 2026 National Planning Policy Framework.
Built for small Green Belt sites (1-20 homes).
Use toolA simple path through the decisions
Landowners usually need three answers: what might it be worth, can it get planning, and who should take the risk. The tools are arranged around that sequence.
Estimate
Use value and yield tools to understand the scale of the opportunity.
Choose route
Decide whether PiP, outline planning or pre-app advice should come next.
Compare offers
Check whether a deal captures enough of the planning and plot value uplift.
More landowner resources
Want a site-specific view?
The tools give useful ranges. A mapped assessment can check constraints, policy and local context.