Nearly 4 in 10 homeowners say they regret something about the property they bought, according to a survey from the HomeOwners Alliance. That’s a lot of people wishing they’d spotted something sooner. I’ve been writing about property for years, and the one pattern I see again and again is that the regret almost always traces back to the viewing — specifically, what people didn’t look at because they didn’t have a proper checklist in hand. Here’s what you actually need to know.
When you’re buying an apartment, the stakes are high. A missed crack, an ageing boiler, or dodgy wiring can cost you thousands within months of moving in. That’s why I always tell people to treat a viewing like a job interview — you’re not just looking, you’re inspecting. And you need a system. If you’re also weighing up whether to rent or buy, our guide on apartment buying tips for UK first-timers covers the financial side of that decision. For now, let’s focus on what to check when you’re standing inside the flat.
What a thorough apartment viewing actually covers
The biggest mistake I see is people treating a viewing like a casual walkthrough. You’re not there to imagine where your sofa will go — you’re there to uncover problems that could cost you a fortune. A proper inspection covers the structure, the services, and the legal paperwork. And it starts before you even ring the bell.
Block out at least 45 minutes to an hour for the viewing. That’s the minimum to do it properly. Start outside. Look at the roof if you can see it from ground level — a full replacement on a typical semi-detached house runs between £6,000 and £12,000. In an apartment block, you’re usually not responsible for the roof, but the service charge will reflect the cost. Check the damp-proof course (DPC) — it should be visible as a dark line about 150mm above ground level, roughly two brick courses up. If it’s bridged by soil or paving, moisture can travel up the wall.
Inside, head straight for the boiler. It typically lasts 10 to 15 years. If it’s over 10 years old, budget for a replacement soon — that’ll set you back £1,500 to £3,500. The pressure gauge needle should sit around 1 to 1.5 bar when the system is cold. An annual service is essential for safety and to keep the warranty valid. Ask to see the service records. If the seller can’t produce them, that’s a red flag.
In the kitchen, open every cupboard and drawer. Kitchens are expensive to replace — £5,000 to £15,000 or more for a standard fit. Look for water stains under the sink, check that the extractor fan works, and run the taps to test water pressure. If the double glazing has a FENSA certificate, check the date — it typically lasts 20 to 25 years, and a full replacement for a three-bed semi costs around £5,000 to £8,000. For an apartment, the cost scales down but still matters.
If the property has a loft space, get up there. Current building regulations recommend 270mm of insulation. Topping it up costs £300 to £500 for a typical loft — cheap insurance against heat loss. But more importantly, look at the wiring. Rubber-insulated cable (black) or cloth-wrapped cable needs replacing urgently. That’s a fire risk and a major renovation cost.
Why this matters more than you think
Here’s the thing about apartment buying: you’re not just buying the flat, you’re buying into the building. A problem in the communal areas — a leaky roof, outdated electrics in the corridors, a crumbling facade — will hit your service charge and potentially your property value. That’s why the communal inspection is just as important as the flat itself.
Let me give you a scenario. You find a flat you love. The boiler is 12 years old but still running. The kitchen is dated but functional. The price is right. You skip the loft inspection because it’s a bit dusty. Six months after moving in, the boiler fails in January. That’s £2,500 you didn’t budget for. Then you discover the wiring in the loft is cloth-wrapped and needs a full rewire — another £3,000. Suddenly that “good deal” doesn’t look so good.
According to the survey, 37% of homeowners regret aspects of their purchase. That’s more than a third. The regret isn’t usually about the colour of the walls — it’s about the things they could have spotted but didn’t. A proper checklist turns that around. It gives you leverage to negotiate on price or walk away before you’re committed.
If you’re buying a leasehold flat, the legal side is even more critical. Our article on leasehold vs freehold flats explains the risks around ground rent and service charges that can catch buyers out. The inspection checklist and the legal due diligence go hand in hand — one without the other leaves you exposed.
Where people go wrong during viewings
I’ve heard every story. The buyer who fell in love with the light and forgot to check the boiler. The couple who assumed the seller’s survey covered everything. The first-timer who didn’t know they could ask for certificates. These mistakes are common, but they’re also avoidable. Here are the four I see most often.
Rushing the viewing and missing the boiler’s age
The average viewing lasts about 20 minutes. That’s not enough. You need 45 minutes minimum to check the boiler, the electrics, the windows, and the structure. A boiler over 10 years old is a ticking clock. Replacement costs £1,500 to £3,500. If you don’t check the age and service history, you’re buying a problem you didn’t price in. Ask the seller or estate agent for the boiler’s installation date and the last service record. If they can’t provide it, factor the replacement cost into your offer.
Ignoring the electrical safety certificate
A licensed electrician should issue an EICR every five years. Many sellers don’t have one, and many buyers don’t ask. That’s a mistake. Faulty wiring is a fire risk and an expensive fix. If the property doesn’t have a current EICR, you can request one as a condition of the sale. The seller may push back, but it’s a reasonable ask. If they refuse, consider it a warning sign. You can also get a property lawyer to review the legal implications of missing certificates before you proceed.
Overlooking cracks that signal subsidence
Not all cracks are the same. Hairline cracks are usually cosmetic. But cracks wider than a £1 coin, stepped cracks in brickwork, or cracks near windows and doors can indicate subsidence — a structural problem that’s expensive to fix and hard to insure. I always carry a £1 coin to viewings. If a crack swallows it, I’m asking serious questions. If you spot these signs, get a structural engineer’s report before you exchange contracts. It could save you tens of thousands.
Forgetting to check the loft and wiring
The loft is out of sight and out of mind for most buyers. That’s exactly why you need to look. Rubber-insulated cable (black) or cloth-wrapped cable is a fire hazard and needs replacing urgently. A full rewire on a flat can cost £2,000 to £5,000 depending on the size. Also check the insulation level — 270mm is the current recommendation. Topping up costs £300 to £500, which is cheap compared to the heating bills you’ll save.
→ Scroll right to see all columns
| Item | Typical lifespan | Replacement cost |
|---|---|---|
| Boiler | 10–15 years | £1,500–£3,500 |
| Double glazing | 20–25 years | £5,000–£8,000 (3-bed semi) |
| Kitchen | 15–20 years | £5,000–£15,000+ |
| Roof | 25–50 years | £6,000–£12,000 (semi-detached) |
If you’re a first-time buyer, the learning curve is steep. Our guide on first-time buyer apartment tips walks through the whole process from viewing to completion. The inspection is just one piece, but it’s the piece where most people drop the ball.
Your step-by-step apartment inspection guide
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This is the system I recommend to anyone buying an apartment. It’s not exhaustive — you’ll still want a full building survey from a qualified surveyor — but it catches the most common and most expensive problems before you’re committed.
Start outside and work your way in
Begin with the building’s exterior. Check the roof line from ground level — missing tiles, sagging sections, or moss buildup can indicate problems. Look at the brickwork for cracks wider than a £1 coin, especially near windows and doors. Check the DPC is visible and not bridged by soil or paving. In an apartment block, note the condition of communal areas — corridors, stairwells, and the entrance. If they’re poorly maintained, the service charge may be about to rise.
Test every service and appliance
Turn on taps in the kitchen and bathroom. Check water pressure and how long it takes to run hot. Flush the toilet and watch for slow drainage. Open every window and check they close properly. Test the extractor fan in the kitchen and bathroom. If the property has an intercom or entry system, test that too. These are small things, but fixing them after you move in is a hassle you don’t need.
Check the boiler and heating system
Find the boiler and note the make, model, and installation date. Check the pressure gauge — it should read between 1 and 1.5 bar when cold. Turn the heating on and feel every radiator. Cold spots at the bottom can mean sludge buildup; cold radiators entirely could mean a bigger problem. Ask for the annual service records. If the boiler is over 10 years old, budget for a replacement. A carbon monoxide alarm is a sensible addition in any property with a gas boiler — it costs under £20 and could save your life.
Inspect the electrics and safety devices
Ask to see the EICR. If it’s more than five years old or doesn’t exist, request a new one as a condition of sale. Check that smoke alarms are installed on every floor and that there’s a CO alarm in any room with a solid fuel appliance. Test a few light switches and plug sockets to make sure they work. If you see black rubber-insulated cable or cloth-wrapped cable in the loft or behind the consumer unit, that’s an urgent replacement needed.
- 1Check the boiler age and pressureFind the boiler, note the installation date, and check the pressure gauge reads 1–1.5 bar when cold. Ask for annual service records.
- 2Test every tap, toilet, and radiatorRun taps for 30 seconds to check pressure and hot water speed. Flush toilets. Feel every radiator for cold spots.
- 3Inspect the loft for wiring and insulationLook for rubber-insulated or cloth-wrapped cable (needs urgent replacement). Check insulation is at least 270mm deep.
- 4Ask for all safety certificatesRequest the EICR (every 5 years), Gas Safety Certificate (annual), and FENSA certificate for double glazing. If missing, negotiate or walk away.
If you’re buying a leasehold apartment, the service charge and ground rent terms are just as important as the physical condition. Our article on apartment living pros and cons covers what to watch for in the lease agreement, including hidden fees that can catch new buyers off guard.
Frequently asked questions about apartment inspections
Can I negotiate the price if the inspection finds problems? ▾
Do I need a full building survey or just a viewing checklist? ▾
What if the seller won’t provide the EICR or Gas Safety Certificate? ▾
How long should I spend on a viewing? ▾
Should I check the communal areas in an apartment block? ▾
What’s the most expensive thing to miss during a viewing? ▾
Sources and Further Reading
Understanding mortgage penalties for early repayment — If you’re buying with a mortgage, early repayment charges can catch you out if you need to sell or remortgage within the first few years. Worth reading before you commit to a deal.
The future of UK apartment living — Market trends and expert predictions on where apartment values are heading, including the impact of energy efficiency regulations and changing buyer preferences.
House viewing checklist UK. Survey Ready, 2024.
Home inspection checklist. Property Store, 2024.
Top tips: things not to forget when viewing a property. HomeOwners Alliance, 2024.
