Know the numbers before you commit
A full residual appraisal — build, planning, contributions, finance and disposal — that tells you what the land is worth and what you will make. Share it or export it when you take the deal to a lender.
Residual appraisal
What is it worth?
Start with gross development value before deducting what the scheme costs to build, consent, fund and sell with target profit protected. The residual is what you can pay for the site.
Illustrative example. Appraisal runs the same calculation against your own figures.
Gross Development Value
Start with the accommodation schedule
Every number downstream depends on what you are selling. Set out the scheme, areas and Use Classes and your gross development value follows from them.
Planning Costs
The costs people forget to model
Option and legal fees, consultants, surveys and application costs. Built-in guidance prompts you for each one, so the line that could sink a scheme is not the line you left out.
Development Contributions
CIL and Section 106, handled
Community Infrastructure Levy and Section 106 contributions modelled properly, so your land offer already accounts for what the authority will ask of you.
See what breaks the deal before it does
Sensitivity analysis shows how your profit moves when build costs rise or values soften — so you know how much room the scheme has before you exchange, not after.
Building Works
Where the project is won or lost
Build costs to RICS NRM 1, priced per m² or broken down in full.
- Cost per m² for early appraisals, full breakdown when you have one
- Materials, labour and major trade or work packages
- Invite builders, trades and consultants in to price their own sections
Disposal Cost
The last few percent of your margin
Agent, legal, marketing and tax costs land at the end of a project, which is exactly why they get left out at the start. Appraisal accounts for them from the first draft.
Finance & Strike Price
Work back to your strike price
With funding costs, timelines and sales tails in, slide to your target profit margin and Appraisal determines the price, flagging mezzanine or bridge finance too. Add waterfall payments to strike price and development profit to clearly show who is paid what.
Powering 4,500+ property professionals
What site sourcers, land agents and developers say about BOOM!
The same data, a fraction of the price
Searchland, LandTech and Nimbus charge an average of £3,540 a year. BOOM! is £540 a year with every add-on included, or £216 for the sourcing data on its own — the £20 a month plan, billed annually.
That is £3,000 a year back into your next deal.
We can charge less because we cost less to run: a small team, no sales force, and no venture capital demanding a price rise every year. The platform is also only part of what we do — the others sell a sourcing platform and nothing else.
Explore more with our video tutorials
Engaging with the sensitivity analysis
10 Jan 2025
How to track changes and save a new appraisal from version history
3 Jan 2025
How to apply different build cost rates to Use Class components of a development
3 Jan 2025
How to quickly appraise a development project
3 Jan 2025
How to prepare an Accommodation Schedule and calculate your GDV
3 Jan 2025
Run your next appraisal in BOOM!
Unlimited appraisals on Professional. Build one from your own figures and see the residual land value for yourself.
Basic is free forever. Professional is 7 days free, cancel anytime.