TL;DR
Most buyers do their due diligence in the wrong order: they fall for the house first, then go looking for reasons to justify the offer. The information that should *shape* the offer — what the seller paid, whether the street floods, what the running costs will be, whether the loft is even extendable — is mostly free, mostly official, and mostly checkable in an afternoon. You just have to know which dataset answers which question.
This is the complete pre-offer checklist. Eleven things to check before you put a number in writing, each one with what to check, the official source, and what "bad" looks like. None of it replaces a survey or a solicitor's searches — those come later, after your offer is accepted. This is the cheaper, faster work that tells you whether to offer at all, and how much.
A note on coverage before we start: the two most useful datasets — HM Land Registry Price Paid and the EPC Register — cover England and Wales only. Scotland has its own Registers of Scotland and Scottish EPC register; Northern Ireland is separate again. We flag the geography on every item, because overclaiming national coverage is the single most common mistake in property guides.
1. Price history — what did they pay, and when?
What to check. Pull the full sales history of the exact address, plus recent sales of similar homes on the same street and postcode. You're looking for two things: the trajectory of this specific property, and a fair-value range for the offer.
The source. HM Land Registry Price Paid — the complete, official record of every residential sale in England and Wales since 1995. It's the same data the portals draw on, but the raw register includes the property type and whether each sale was new-build or established. Our free area report surfaces the local sold-price picture by postcode and type; the full property report ties it to the specific address.
What "bad" looks like. A short ownership period with a large price jump and no obvious works is a possible flip — check the survey for cheap finishing over hidden problems. A property that's changed hands repeatedly in a short window is worth a hard question to the agent: *why?* And an asking price well above recent comparable sales of the same type on the same street is simply a number to negotiate down, not a fact to accept.
2. EPC — energy rating and running cost
What to check. The Energy Performance Certificate rating (A–G), the listed heating type, and the estimated annual energy cost. EPCs are valid for ten years, so check the lodgement date — a 2015 certificate predates the energy-price shifts of the 2020s and any work done since.
The source. The EPC Register, administered by MHCLG. Every property marketed for sale in England and Wales must have a valid EPC. We read it live and convert the rating into an estimated annual heating cost in the cost-of-living breakdown for the postcode.
What "bad" looks like. A D, E or F rating with gas or — worse — electric or oil heating means high running costs. A D-rated home with gas heating can cost roughly £2,000–3,000 a year to heat; a B costs closer to £800–1,200. Over a decade that gap is real money. An F or G rating also matters for landlords: rentals already need to meet a minimum, and the proposed move toward an EPC C target by 2030 would force expensive upgrades.
3. Flood risk — rivers, sea, and surface water
What to check. Whether the property sits in a statutory Flood Zone, and separately whether it's at risk from surface-water (flash) flooding. These are two different things and people conflate them constantly.
The source. The Environment Agency Flood Map for Planning for England, which sets out Flood Zones 1, 2, 3 and 3b. Scotland uses SEPA's flood maps; Wales uses Natural Resources Wales. Crucially, a live "no flood alert today" notice is *not* the same as "not in a flood zone" — alerts are real-time weather warnings; Flood Zones are the long-term planning designation. We cover the distinction in full in our flood-risk guide.
What "bad" looks like. Flood Zone 3 (high probability) and 3b (functional floodplain) are the serious ones — they affect insurance, mortgageability and resale. High surface-water risk on the EA map matters even in Zone 1, because it doesn't show up in the river/sea designation at all.
4. Planning — what could get built next to you
What to check. Live and recent planning applications on the property and its immediate neighbours, plus statutory designations on the land itself: conservation area, listed building, tree preservation orders, green belt, Article 4 directions.
The source. planning.data.gov.uk, the national planning data platform, plus the local authority's own planning portal for live applications. Listed-building and heritage designations also come from Historic England. Our free area pages list every statutory designation that applies to a postcode, drawn from the live planning data.
What "bad" looks like. An approved application for flats or a large extension on the adjoining plot can change the light, parking and outlook you're paying for. A conservation area or Article 4 direction on the property itself cuts both ways: it protects the streetscape but removes permitted-development rights, so that loft conversion you were banking on may need full planning permission. Check before you assume you can extend.
5. Crime — read the rate, not the raw count
What to check. Recorded crime in the immediate area over recent months, by category. The goal is a sense of the *type* and *trend*, not a single scary number.
The source. Police.uk, the official street-level crime data for England, Wales and Northern Ireland. It's mapped to anonymised "snap points" near the location of each incident, so it's an area indicator, not a precise per-house figure.
What "bad" looks like. Here's the trap: town-centre postcodes show high raw counts simply because lots of people pass through — shops, pubs, stations all generate reports. A high count in a busy area can be less meaningful than a rising trend in a quiet residential one. Look at the mix (anti-social behaviour and shoplifting read very differently from burglary and violence) and the direction of travel. We explain the pitfalls in our crime guide.
6. Road safety — the check almost nobody does
What to check. The record of road traffic collisions near the property, especially if you have children or will be walking to a station or school.
The source. DfT STATS19, the police-reported road casualty dataset for Great Britain, recording the location and severity of every reported collision.
What "bad" looks like. A cluster of serious or fatal collisions on the road you'd cross daily, or at the junction outside the house, is a quiet but real liability that no estate-agent listing will ever mention. It's particularly worth checking for a family home on or near a fast through-road.
7. Schools — catchment is not the same as admission
What to check. The Ofsted rating and recent inspection history of nearby schools, and — critically — whether "near a good school" actually means "would get a place there".
The source. Ofsted for inspection judgements and GIAS (Get Information About Schools) for the official school register, both England. Scotland, Wales and NI have their own inspectorates.
What "bad" looks like. Proximity to an Outstanding school can carry a real price premium — but catchment areas shrink in popular years, and being 400m away is no guarantee of admission. A listing that leans heavily on a school's reputation without you checking the actual admission distances is a premium you might be paying without getting. Confirm the current catchment with the admissions authority, not the agent.
8. Broadband — "available in the area" is not "available here"
What to check. The fixed broadband technology and realistic speeds actually available at the address — not the postcode average, and not "coming soon".
The source. Ofcom Connected Nations for the national coverage picture, cross-checked against address-level availability. We surface broadband for the postcode in the area report and the property report.
What "bad" looks like. "Fibre available in the area" on a listing can mean fibre to a green cabinet three streets away while this house is on slow copper. For anyone working from home, the difference between full-fibre and a few megabits is a daily quality-of-life issue.
9. Council tax — the cost you'll pay forever
What to check. The council tax band of the property and the current annual charge for that band in the local authority.
The source. VOA council tax bands for England and Wales (the Scottish Assessors Association covers Scotland). Bands run A–H in England, A–I in Wales, and were set on 1991 (England) / 2003 (Wales) values, so they don't track current prices neatly.
What "bad" looks like. A high band relative to the area, or a band that looks out of step with similar neighbouring homes. Council tax also reads as a rough proxy for an area's housing mix. We fold the band into the cost-of-living breakdown so you can see total monthly running costs in one place.
10. Tenure — freehold, leasehold, and the leasehold trap
What to check. Whether the property is freehold or leasehold and, if leasehold, the remaining lease length, the ground rent, the service charge, and whether any escalating ground rent clause exists.
The source. The HM Land Registry title register (a few pounds for the official copy), confirmed by your solicitor before exchange.
What "bad" looks like. A lease under about 80 years is a warning sign — extending it triggers "marriage value" and gets sharply more expensive the shorter it gets, and many lenders are wary of short leases. A ground rent that doubles every 10 or 15 years can make a flat near-unsellable. A high or fast-rising service charge eats into affordability every month.
11. Environmental — radon, air quality, noise
What to check. Three things people rarely think about until they've moved in: radon gas exposure, local air quality, and ambient noise (road, rail, aircraft).
The source. UKHSA maps radon affected areas; DEFRA publishes air-quality and strategic noise data. The deprivation backdrop comes from MHCLG's IMD 2025.
What "bad" looks like. A property in a high radon-potential area may need a simple test and, occasionally, mitigation. Persistent poor air quality near a busy road is a long-term health and resale factor, and aircraft or motorway noise is the kind of thing that's invisible on a sunny Saturday viewing and unbearable on a Monday-morning rush hour.
Putting it together: one report, before you offer
You can do every check above yourself, free, from the official sources named — and we'd encourage it. The catch is that it means logging into roughly a dozen separate government portals and reconciling the answers by hand.
Our free area report covers the postcode-level picture — sold prices, crime, flood, broadband, schools — at no cost. The full property report ties all eleven checks to a specific address in a single document for a £14.95 one-off fee — no subscription. It is not a substitute for a survey or your solicitor's searches; it's the cheaper, faster work that tells you whether to offer, and how much. See pricing for what's included.
Honest caveats
This is pre-offer screening, not legal or structural due diligence. A RICS survey and your solicitor's local searches happen *after* your offer is accepted and they catch things no dataset can — structural movement, drainage, restrictive covenants, planning enforcement. Don't skip them on the strength of a checklist.
Coverage is uneven across the UK. HM Land Registry Price Paid and the EPC Register are England and Wales only. Ofsted and the Flood Map for Planning are England-specific; Scotland and Wales have equivalents. Police.uk and DfT STATS19 have their own geographies. We never claim a Scottish or NI figure from an England-and-Wales source.
Area data is an area indicator, not an address verdict. Crime is mapped to anonymised points; flood and radon are zonal; broadband "availability" can vary house to house. Use these to ask better questions, not to deliver a final judgement on a specific front door.
Datasets lag reality. Price Paid registration runs weeks behind completion; EPCs can be a decade old; planning portals update on the council's schedule. Always check the date stamp on each source.