Pre-offer due diligence: the £1,200 the industry hopes you don't save

The asymmetry

When you offer on a UK property, you typically learn whether anything is wrong with it after you have:

• paid your solicitor’s instructed fee (£300–600)
• paid for local-authority, water, and environmental searches (£500–800)
• spent 4–8 weeks emotionally committing to the move
• told your landlord, your kids’ school, and your in-laws

That is when the searches come back and the freeholder discloses the £18,000 cladding remediation, or the chancel-repair liability on the neighbour’s land surfaces, or the survey notes lateral movement in the rear wall.

About 30% of UK property chains collapse, and a good portion of those collapses begin with a finding that should have surfaced before the offer.

What pre-offer DD looks like

A serious pre-offer pass uses only public-data sources — no searches required, no fees paid — to flag:

• Title basics. Tenure (freehold / leasehold / commonhold), known charges, recent transfers, restrictive covenants on file.
• Leasehold flags (where applicable). Years remaining, ground-rent structure, recent service-charge history.
• Planning. Applications within 200m in the last 5 years — the cellular mast, the four-storey rear extension, the change-of-use to short-let.
• Environmental. Flood Zone 2/3, contaminated-land registers, radon hotspots, air quality.
• Freeholder behaviour. Companies House filings, portfolio size, director continuity. A freeholder with 80 properties and a 90-day average response time tells you something.
• Listing history. Three relistings in 18 months at gradually lower prices is not the vendor “testing the market.”

None of this is private data. All of it is the joined-up version of what every UK buyer pays £700 in searches to discover four weeks later.

What surfaces it pre-offer

The Property Genome — Brilliant Move’s permanent record of every UK property — joins these public sources on the UPRN, the unique property identifier. A single page tells you everything the data knows about the address.

Brilliant Move’s due-diligence specialist (we call it Dilly) reads that page and writes a red-flag report. The headline metric — % of red flags surfaced pre-offer — is the one number the platform is built around. The industry today surfaces ~20% pre-offer. Our target is 70%+.

When pre-offer DD is not enough

Two classes of risk only the searches and the survey can find:

• Localised flooding history from drains not in the Environment Agency dataset.
• Structural condition — damp, lateral movement, roof state — that requires a chartered surveyor.

These remain post-offer findings. The pre-offer pass does not replace them; it filters out the properties not worth getting to that stage.

Information only. Brilliant Move’s DD pack is not a substitute for a solicitor’s report or a RICS Level 2/3 survey. We surface what the public record contains; your professional team confirms it on your specific property.