5 things to check before
making an offer

Zoopla's "Zestimate" and Rightmove's estimated value are both generated by automated algorithms. They're area averages dressed up as property-specific valuations. What you actually need is what this type of property has sold for on this street in the last twelve months.

This is freely available. HM Land Registry publishes every registered property sale in England and Wales, updated monthly. You can search it by postcode for free at GOV.UK — search for "Land Registry house prices" and use the Price Paid Data search tool. Filter to your postcode, the same property type (detached, semi, terraced, flat), and the last 12–18 months.

What you're looking for: the typical range of prices for comparable properties. If five similar houses on the same street have sold for £380,000–£400,000 in the last year, and this one is asking £445,000, that's meaningful information — not a reason to walk away, but a reason to understand what the vendor thinks makes their property worth 10–15% more than the street average.

Sometimes the answer is clear: it's been extended, renovated, or backs onto a park. Sometimes there's no good reason. That gap is your negotiating room.

The estate agent will not volunteer this information. They are incentivised to give the impression that the property is in demand. But time on market is one of the most useful pieces of information a buyer can have, and it's freely available.

Every Rightmove listing shows the date the property was first listed — it's in small text near the top of the listing, or you can check by clicking "Property details" and looking at the listing history. In many markets, a property that's been available for 60 days or more is a significantly different proposition from one that listed two weeks ago.

Here's why it matters. When a property first lists, the vendor has psychological and financial flexibility: they believe the price is right, they haven't yet experienced the wear of showing weekends, and they haven't started to worry about what it means if it doesn't sell. After 8–12 weeks, the vendor's position has changed. They've usually had viewings that didn't convert. They've had conversations with the agent about reducing the price. There's a reason it's still on the market.

One caveat: properties that have been "relisted" — taken off the market and put back on — reset the clock. Always check for this by looking at price history. If a property shows a price reduction but the listing is only two weeks old, it's been on longer than it appears.

Every property sold or rented in the UK is required to have a valid energy performance certificate (EPC) — a graded assessment from A (most efficient) to G (least). You can find any property's current rating by entering the postcode on the government's EPC register at gov.uk/find-energy-certificate.

Why does this matter more in 2026 than it did five years ago? Three reasons.

Running costs. An EPC-F property can cost £3,000–£5,000 more per year to heat than an equivalent EPC-B property. Over a ten-year ownership period, that's £30,000–£50,000 in extra energy bills — before any remediation works. That cost is real and it's yours from the day you complete.

Mortgage rates. Several major lenders — including Halifax, Barclays, and Nationwide — now offer green mortgage products with lower rates for properties with EPC A or B ratings. The difference is typically 0.1–0.25 percentage points. On a £350,000 mortgage, that's £350–£875 per year — and it compounds over the life of the loan.

Future saleability. There have been several proposals — some enacted, some stalled — requiring rental properties to meet minimum EPC standards. Similar requirements for owner-occupied properties are widely anticipated in the coming decade. A property with a very low rating may be significantly harder to sell in future, or may require capital expenditure you can't currently budget for.

None of this means you shouldn't buy an EPC-E or F property. It means you should factor the costs into your offer price, not discover them after completion.

Flood risk is the hidden factor that catches buyers by surprise more than almost anything else. It's not just about whether the property has flooded before — it's about insurance costs, mortgage availability, and the increasing frequency of flood events as climate patterns shift.

Rightmove and Zoopla both show a basic flood risk indicator on listings, but these are simplified summaries derived from Environment Agency data. They don't tell you which flood type applies (river, surface water, groundwater, coastal), what the probability is, or what the practical insurance and resale implications are.

The authoritative free source is the Environment Agency's "Check your long term flood risk" tool at check-long-term-flood-risk.service.gov.uk. Enter any postcode and you'll see the risk broken down by flood type. The categories — "high," "medium," "low," "very low" — each correspond to approximate annual probability: high is greater than 3.3%, medium is 1–3.3%, low is 0.1–1%, and very low is below 0.1%.

Some things to understand about these categories. "Low" risk — which many buyers assume is fine — still means up to a 1% annual probability, or roughly a 10% chance of flooding over a typical 10-year ownership period. For surface water flooding in particular, "medium" is not as reassuring as it sounds in an era of increasingly intense downpours.

Beyond the risk level, check whether the property has flood defences relying on third parties — EA-maintained flood barriers, for example — and what the history of defences looks like. Insurance comparison sites like Quotezone let you run actual quotes with the property's details, including flood risk data, before you're committed.

This is the one check that isn't a data lookup — it requires a conversation. And yet it's arguably the most important factor in whether your transaction will complete smoothly, and how much negotiating leverage you have.

The vendor's circumstances affect two things: their motivation to sell, and the complexity of the chain above them. A vendor who is relocating for work and has already found a new home in another city is significantly more motivated than a vendor who is in no hurry and has set an aspirational price on the off-chance someone comes along. A chain-free seller — someone who is moving into rented accommodation, going into care, or is the executor of an estate — offers a much simpler path to completion than someone dependent on their own purchase completing first.

You can ask the estate agent directly. Good questions include: "Is the vendor already in a position to proceed?", "Is this a chain-free sale?", "Has the vendor found their next property?", and "Is there a reason the vendor is selling at this time?" A competent agent will give you useful information. You should read between the lines: "the vendor is very motivated to move quickly" is often code for a difficult chain or pressing personal circumstances.

Why does this affect your offer? Because if the vendor needs to complete by a specific date — because their onwards purchase is lined up, or because a financial deadline is approaching — you have genuine leverage to offer a lower price in exchange for speed and certainty. Chain-free buyers are genuinely worth something to sellers. Some buyers have used this to negotiate £5,000–£15,000 off asking price simply by demonstrating they can move quickly with no chain above them.