The estate agent has said the flat is ‘full of character’. That may mean original cornicing and a lovely bay window. It may also mean a roof older than your favourite pub, wiring from another era and a cellar that considers itself a swimming pool. The best survey questions before buying help separate charm from costly surprises – before you exchange contracts and the property becomes very much your problem.
A survey is not a box-ticking exercise or a gloomy document designed to ruin a Saturday viewing. It is your clearest view of a home’s condition, the risks attached to it and the likely work ahead. Asking the right questions before, during and after the survey gives you practical information you can use: whether to proceed, renegotiate, budget for repairs or walk away with your deposit intact.
Start with the questions that shape the survey
Before booking, tell the surveyor what you know about the property and what is making you hesitate. A good instruction is not simply, ‘Please survey this house.’ It is, ‘This is a 1930s semi with a loft conversion, visible cracking near the rear extension and a damp smell in the front room. Can you assess these points?’
Ask which type of RICS survey suits the property and your plans. A RICS Level 2 Home Survey is often appropriate for a conventional property in reasonable condition. A RICS Level 3 Building Survey is more detailed and is usually the wiser choice for older, altered, unusually built or visibly worn homes. If you are buying a Victorian terrace in South East London with a converted cellar and a history of enthusiastic DIY, a Level 3 survey may offer far better value than finding out later that the bargain was wearing a fake moustache.
It is also worth asking whether the survey includes a market valuation. A survey and a valuation serve different purposes. The survey considers condition; a valuation gives an opinion of market value on the inspection date. Lenders arrange their own valuation for mortgage purposes, but that is not a condition survey and should not be treated as one.
The best survey questions before buying
The most useful questions are specific enough to produce a useful answer, but open enough that the surveyor can explain the context. The following topics should be on your list.
What are the urgent defects, and what needs doing first?
Start here. Ask the surveyor to distinguish between urgent repairs, essential maintenance and desirable improvements. A cracked pane of glass and an actively leaking roof are not equal, even if both appear in the same report.
Ask what could worsen quickly if left alone, whether there is any immediate safety concern and whether a specialist inspection is needed before exchange. Electrical systems, gas installations, drains, roofing and timber defects may require further investigation because a visual survey has sensible limits. Your surveyor can identify warning signs, but they will not dismantle a consumer unit or lift every floorboard in the house.
Are the cracks, damp or movement serious?
Cracks and damp patches tend to make buyers’ imaginations sprint ahead. Sometimes they indicate significant movement or moisture problems. Sometimes they are historic settlement, condensation, leaking gutters or a bathroom with poor extraction.
Ask what the likely cause is, what evidence supports that view and whether the issue appears active. If movement is suspected, ask whether a structural engineer’s advice is required. For damp, ask whether the surveyor sees signs of penetrating damp, rising damp, condensation or plumbing leaks. The remedies differ wildly, as do the invoices.
What condition are the roof, chimneys and rainwater goods in?
Roofs are expensive, elevated and conveniently difficult to inspect from a viewing. Ask whether the coverings, flashings, chimneys, gutters and downpipes appear sound, and whether access limitations affected the inspection.
A slipped tile does not automatically mean a new roof. Equally, a roof that looks fine from the pavement may have tired felt, failing leadwork or blocked valleys. Ask for an indication of the likely scope of repair, rather than a heroic attempt at a precise quotation. Surveyors identify condition and risk; contractors price the work once they have inspected it in detail.
Have alterations been done properly?
Loft conversions, rear extensions, removed chimney breasts and open-plan kitchens can be brilliant. They can also involve missing approvals, questionable structural support or work that was never properly finished behind a fresh coat of paint.
Ask whether there are visible signs of alteration and whether building regulations approval, planning consent or structural documentation should be checked by your solicitor. This is especially relevant where walls have been removed or the property has been extended. Do not assume that a smart new kitchen proves the unseen work was equally smart. Granite worktops have covered many sins.
What should I know about drainage, services and insulation?
Ask whether the visible parts of the plumbing, heating, electrical installation and drainage raise concerns. A survey is visual and non-invasive, so the answer may include recommendations for qualified checks. That is not evasive language – it is a proportionate response to systems that cannot be fully tested during a standard inspection.
You should also ask about ventilation, insulation and energy efficiency. Poor insulation can mean higher bills, while inadequate ventilation can encourage condensation and mould. In period homes, upgrades need thought: sealing every gap without improving ventilation can create its own damp-related drama.
Are there leasehold, shared or local factors to investigate?
For a flat, ask what responsibility appears to sit with the leaseholder and what sits with the freeholder or managing agent. The surveyor may highlight concerns with communal roofs, external walls, balconies or shared services, but your solicitor must check the lease, planned major works and service-charge paperwork.
In parts of South London, buyers may also need to consider Japanese knotweed, flood risk, nearby transport works, former land uses or the particular quirks of a conservation area. Ask whether the property’s setting creates any visible concerns and which matters need legal or specialist checks. A surveyor will not predict every future planning application, sadly, even with a very strong coffee.
Questions to ask when the report arrives
Read the report before the follow-up conversation, but do not feel you must translate every technical phrase alone. The value of a RICS survey is not just the PDF. It is the informed conversation that turns findings into decisions.
Ask the surveyor which three issues matter most and whether any findings would change their own approach to buying the property. Ask what should be investigated before exchange, what can wait until after completion and what a sensible first-year maintenance budget might look like.
If the report uses condition ratings, ask for the plain-English version. A condition rating does not always mean a catastrophe. It signals the level of attention needed. The key is whether the defect is urgent, potentially expensive or linked to wider issues.
You can also ask how the findings affect your negotiating position. A surveyor should not tell you what price to offer, but clear evidence of necessary repairs can support a conversation with the seller. Keep it factual: obtain estimates where needed, share relevant findings and avoid treating a minor maintenance note as a reason to demand the moon on a stick.
Use answers to make a calmer decision
Not every defect should stop a purchase. Older homes need maintenance, and even well-kept properties come with a to-do list. The question is whether the condition, likely cost and disruption fit your budget and appetite. A buyer happy to renovate may view tired windows differently from a family that needs to move in with minimal upheaval.
Be wary of two opposite mistakes: panicking over every amber flag, or dismissing repeated recommendations because you love the garden. Patterns matter. Roof defects, damp, poor drainage and missing alteration records can be connected rather than separate niggles.
A clear survey gives you permission to proceed with your eyes open, renegotiate where evidence supports it, or step away when the risk is wrong for you. That is not negative. It is exactly what informed buying looks like: less guesswork, fewer nasty surprises and a much better chance that your new home remains charming for the right reasons.