Development appraisal · feasibility · finance

Know if the deal works.

Screen, appraise and stress-test residential development opportunities using the methodology of experienced developers — before you spend another day on a site.

Built from a career appraising 10,000+ homes and ~£5bn of residential GDV at Berkeley Homes & London Square.

Don't spend a week on a deal you should have rejected in ten minutes.

01 · Screen

Is it worth pursuing?

A ten-minute viability test. Pass, investigate or reject — with the reasons.

02 · Appraise

Exactly how does it perform?

The full residual, cashflow, finance and sensitivity model.

03 · Review

Have it challenged.

Your assumptions independently stress-tested by an experienced developer.

04 · Capital

Fund the deal.

Take a viable appraisal straight into development-finance discussions.

The question Residual is built to answer

What has to be true for this deal to work?

Good appraisal isn't calculating an answer. It's knowing which questions to ask — where the risk really sits, which assumption is doing the heavy lifting, and when to walk away. Residual runs the numbers, then tells you exactly what would have to change for a marginal deal to stack.

What Residual does

The developer's process, built into a platform.

The technology reads packs and runs the maths. The reason to trust it is the methodology underneath — the disciplines used to assess major residential schemes, applied to yours.

Real sales evidence

Residual searches Land Registry and Rightmove to build the true sales picture for your site — sold comparables, current stock on the market, and how fast it's absorbing.

Land Registry + Rightmove

Grounded build costs

Prices the build against real developer benchmarks by type, size and spec — then lets you override every line with your own quotes and cost plan.

Your assumptions + benchmarks

Finance the way lenders see it

Debt capped at the lower of LTGDV and LTC, rolled-up interest, equity-first cashflow — so you see peak debt, equity required and finance cost as a lender would.

Stress-test everything

Sensitivity, tornado and heat-map analysis show which assumption breaks the deal — and the break-even GDV and build cost you can't cross.

A decision, not a number

Every screen ends in pass, investigate or reject — with the exact next questions to answer before you commit more time.

Shareable output

Export a branded appraisal and viability pack — ready for a partner, a lender or your own file.

Built from real development experience

Built from £5bn of development experience.

Residual was created by Phil Baily after a career in senior preconstruction and development roles at Berkeley Homes and London Square — appraising, testing and bringing forward major residential schemes. It takes the disciplines used to assess complex developments and makes them accessible to SME developers and land buyers.

Why I built Residual →
Berkeley Homes & London SquareWhere the methodology was forged
10,000+Homes & schemes brought forward
~£5bnResidential GDV
Real deals. Real methodology.

Tested against 60+ real appraisals.

Residual is built from the systems, models and commercial processes used across my career — and tested against more than sixty real residential development appraisals. As more deals are screened, those become anonymised benchmarks you can measure your own scheme against.

60+Real appraisals
£/ft²Build by region
%GDVTarget margins
LTC/LTGDVFinance norms
Shows its working

No black box. Your numbers, your call.

Sales values and land price are always your inputs — Residual never guesses them. The sales search shows you the evidence; you decide the value to run. Every verdict is broken down into the tests behind it, so you can see exactly why a deal passes or fails. It's decision-support built the way real developers think — not a valuation, and not a course selling a dream.

The platform

Screen and appraise. That's the product.

The scalable part of Residual is the software — the fast free screen, and the full appraisal you graduate into. Start free, go as deep as the deal deserves.

Screen · Free

Residual Screen

Free

Rapidly test whether a site deserves further investigation — pass, investigate or reject in ten minutes, with the reasons shown.

Screen a deal →
Appraise · Core

Residual Appraise

Full appraisal

Build the complete residual, cashflow, finance and sensitivity model — with the real sales picture searched and assembled for you.

Run an appraisal →
When you need more
Review

Residual Review

From £295

Have your assumptions independently challenged by an experienced developer, with written feedback.

Book a review →
Cost check

Residual Cost Check

Fixed fee

Validate the assumption doing the most work in your appraisal — the build cost — against real benchmarks and quotes.

Check a cost →
Capital

Development finance

Introductions

Take a viable appraisal straight into development-finance discussions with the numbers already in order.

Explore funding →

Got a site? Know if it works.

Screen it in ten minutes — profit, equity, break-evens, and exactly what has to be true for it to stack.