Buying a Fixer-Upper? What to Check First

There’s something thrilling about a house with “potential” — the handsome Victorian terrace with the overgrown garden, the 1930s semi that’s been rented out for a decade. And something terrifying about discovering why it was cheap. So what should I check before buying a fixer upper house? The difference between a bargain and a money pit usually comes down to what you check before you commit. Here’s the full checklist, from the 10-minute viewing tests to the surveys that save you tens of thousands.

The viewing: 15 checks in 30 minutes

On every viewing, run through these — they cost nothing and reveal enormously:

1. Damp: Musty smell? Black spots on walls/ceilings? Peeling paint on ground-floor walls? Fresh paint in patches can be hiding damp — be suspicious of single newly-painted walls.
2. Cracks: Hairline plaster cracks are normal (thermal movement). Stepped cracks in brickwork, cracks wider than a 2p coin, or cracks around doors/windows that stick = potential subsidence. Walk away or budget for investigation.
3. Roof: Look from across the street — slipped, missing or moss-covered tiles? Sagging ridge? From inside the loft: daylight through the roof (bad), damp timbers, or spray-foam insulation (mortgage lenders hate it — see below).
4. Windows: Single-glazed timber in poor condition = £5,000–£8,000 replacement cost. Factor it in.
5. Heating: How old is the boiler? (Check the installation date sticker.) Ancient boiler + old radiators = £2,000–£3,500 replacement.
6. Electrics: Old fuse box with wire fuses? Two sockets per room? That’s a full rewire: £4,500–£7,500.
7. Water pressure: Run the taps — upstairs especially. Trickle = potential supply pipe issues (lead pipes are common in pre-1970s houses and should be replaced: £500–£1,500).
8. Floor levels: Does a ball roll? Sloping floors can mean subsidence, removed walls, or just old-house character. Worth investigating which.
9. Extensions and alterations: Ask when they were done and whether there’s building regs sign-off. Unapproved extensions are your problem after purchase.
10. Japanese knotweed: Check the garden — this invasive plant can make properties unmortgageable. 7 metres is the danger radius. Professional treatment costs £2,000–£5,000+.
11. Neighbours and street: Visit at different times — evening, weekend. Noisy neighbours, parking wars, and antisocial behaviour don’t show on weekday viewings.
12. Phone signal and broadband: Check coverage — some rural or basement properties have dead zones that affect value and livability.
13. Flood risk: Check the GOV.UK flood risk checker — flooding history affects insurance and mortgageability.
14. Planning history: Search the council’s planning portal for past applications — refused extensions, enforcement notices, or approved developments next door.
15. Why are they selling? Ask. Probate sales and relocations are neutral; “we’ve had enough of this place” warrants a follow-up question.

What should I check before buying a fixer upper house? The surveys

Skipping surveys on a fixer-upper is like buying a used car without looking under the bonnet. The options:

• Level 2 (HomeBuyer Report): £400–£800. For conventional, modern properties in reasonable condition. Not enough for a genuine fixer-upper.
• Level 3 (Building Survey): £800–£1,500. This is the one you want. Detailed, intrusive-ish inspection of structure, damp, roof, services. The surveyor lifts loft insulation, checks subfloor where accessible, and gives repair priorities and cost implications. Worth every penny on a doer-upper.
• Specialist surveys as flagged: damp survey (£300–£500, independent — not from a company selling treatment), structural engineer (£500–£1,000 for subsidence concerns), electrical (EICR) (£150–£300), drainage CCTV survey (£150–£300 — collapsed drains cost £3,000–£8,000 to fix, and you can’t see them from the kitchen).

Total survey spend on a serious fixer-upper: £1,500–£3,000. Sounds like a lot until it saves you from a £25,000 subsidence repair or an unmortgageable property. It’s the cheapest money in the whole project.

The budget: what renovations actually cost

Before offering, price the work roughly. Common fixer-upper costs:

• Full rewire: £4,500–£7,500
• New boiler + heating: £2,500–£4,500
• New windows (full house): £5,000–£8,000
• Replastering (full house): £3,000–£5,500
• New kitchen: £8,000–£15,000
• New bathroom: £5,000–£9,000
• Roof repairs: £1,000–£5,000 (full replacement: £5,000–£12,000)
• Damp treatment (genuine): £1,000–£5,000
• Full renovation of a 3-bed: £40,000–£80,000+

The golden rule: add 20% contingency to every estimate, then add 20% to the total. Old houses hide things — that’s not pessimism, it’s statistics. And get builder quotes before exchanging, not after. A builder walking through with you for an hour (£100–£200 for their time, or free if they want the job) gives you real numbers to negotiate with.

Legal checks your solicitor must cover

• Planning permission and building regs for all alterations — get the certificates, not just verbal assurance
• Restrictive covenants — some prevent extensions, businesses, or even certain paint colours
• Rights of way and shared access — who maintains the shared driveway?
• Mining reports — essential in former coalfield areas (much of the North, Midlands, Wales, Scotland)
• Leasehold details — ground rent, service charges, lease length. Short leases (<80 years) are expensive to extend
• Listed status / conservation area — transforms what you’re allowed to do (and the cost of doing it)

The mortgage question

Standard mortgages require the property to be habitable — working kitchen, bathroom, heating, watertight roof. Genuine wrecks need renovation mortgages (funds released in stages) or bridging finance (expensive — 0.5–1% per month). Also note: some lenders now refuse properties with spray foam loft insulation and are cautious about non-standard construction (concrete, timber-frame, thatch). Check mortgageability before falling in love — ask a broker, not just the estate agent.

The viewing checklist to take with you

Print this and take it to every viewing: roof (missing tiles, sagging?), gutters and downpipes (overflowing = drainage issues), damp (musty smell, tide marks, fresh paint patches hiding things), electrics (old fuse box? round-pin sockets?), boiler (ask its age — over 15 years means budget £3,000+ soon), windows (single-glazed = £5,000+ to replace), and cracks (hairline is usually fine; stepped cracks in brickwork need a structural engineer). A fixer-upper is a brilliant buy when the discount exceeds the renovation cost — and a disaster when it doesn’t. The checklist keeps you honest.

The practical takeaway

Run the 15-point viewing checklist, commission a Level 3 Building Survey plus specialist surveys for anything flagged, price the renovation with builder quotes before offering (plus 20% contingency), verify planning/building-regs paperwork, and confirm it’s mortgageable. A fixer-upper bought right — with eyes open and numbers verified — is the best-value route to a great home. A fixer-upper bought on optimism and a lick of paint is the most expensive mistake in property. The difference is entirely in the checking.