Found a house you love, and it comes with a cellar? That can be a real bonus: extra storage, a utility space, or even another room. But a cellar also raises questions that the rest of the house doesn’t. Is it dry? What’s it been used for? Has it been converted, and was that done properly? And which survey will give you the answers you need before you commit? This guide walks through what we look at, what we can and can’t see, and how to choose between a Level 2 and a Level 3 survey.
- Tell us about the cellar, and how you’d like to use it, when you ask for a survey quote.
- Cellars are most common in older houses, where a Level 3 Survey (Building Survey) is often the better fit.
- A damp patch is something to explain, not a diagnosis in itself.
- A converted cellar should come with paperwork, so ask for it early.
- No survey level includes emptying the cellar or opening up walls and floors.
What kind of cellar is it?
An estate agent’s floor plan might show the cellar as a room, but that doesn’t tell you whether it’s suitable to live in. An old coal store, a dry storage space, and a fully converted bedroom are very different things, even if they’re all described as “cellar” or “lower ground floor”.
Look past the decoration. A carpet, a radiator, and fresh paint don’t prove that a storage space has become proper living accommodation. Converting a cellar into a habitable room usually involves waterproofing, ventilation, fire escape arrangements, and building regulations approval. If that’s what you’re being sold, there should be records to show it.
Be clear with us about your plans, too. Using the cellar for bikes and boxes is a different proposition from relying on it as a bedroom or home office. If the space is a big part of why you’re buying the house, tell us before the survey, so we can pay it the attention it deserves.
Ask the seller, through your conveyancer or the agent, about the cellar’s history. When was it converted? Who did the work? Is there a building control completion certificate, a waterproofing specification, or a warranty? Records like these help us understand what’s behind a freshly finished wall.
Choosing between a Level 2 and a Level 3 survey
This is the question we’re asked most, so here’s our straightforward view. The right survey depends on the whole house, but a cellar often tips the balance.
A Level 3 Survey (Building Survey) is usually the better choice for a house with a cellar, especially an older, altered, or converted one. It gives a more detailed description of the construction and any defects we find, with more discussion of likely causes and what to do next. That extra detail really helps below ground, where moisture and hidden structure need careful explanation.
A Level 2 Survey (Homebuyer Report) can still suit a conventional house in reasonable condition with a simple, unconverted cellar that you’ll only use for storage. It’s a solid survey in its own right, not a basic one. Our page on buying a home explains the general choice between the two levels.
The RICS guide to home surveys describes how a Level 3 survey suits older, unusual, or altered properties. Both levels are visual inspections, though. Choosing the more detailed survey doesn’t mean we’ll lift floors or open up walls.
If you’re not sure which to pick, tell us the property’s age, what the cellar is used for, and whether it’s been converted. We’ll recommend the level that suits the house rather than leaving you to guess.
Damp in context
Walls below ground level live in different conditions from walls above it. The surrounding soil, rainwater from gutters and drains, plumbing leaks, poor ventilation, and condensation can all play a part. Some moisture in an unconverted cellar is normal. The question is whether it’s causing harm, and whether it matters for the way you want to use the space.
The RICS consumer guide to damp and mould warns against deciding on a treatment from a moisture meter reading alone. When we survey a cellar, we’ll describe what we see, where it is, and what the likely explanations are, rather than jumping to a single cause.
Our article on how a survey tells condensation, damp, and mould apart explains how we read the evidence in any room, and the same thinking applies below ground. A musty smell, a dehumidifier running in the corner, or salt marks on the brickwork are all clues worth mentioning to us.
A dry day doesn’t prove a cellar stays dry all year, either. Ask the seller whether it’s ever flooded or taken in water after heavy rain. For wider background, the government’s long-term flood risk service shows area-level risk in England, including groundwater where data is available. It doesn’t predict what will happen at an individual property, so treat it as context, not a verdict on the cellar.
The structure around and above
A cellar often gives us a rare view of the underside of the ground floor: the joists, the boards, and what they rest on. That can tell us a lot about the house above. If the cellar ceiling has been boarded over, though, that view disappears, and we’ll say so in the report.
The walls around a cellar may hold back the ground outside and carry the house above. Removed walls, enlarged openings, and lowered floors all deserve an explanation. If we see signs of a structural concern, we’ll say what further advice we recommend, from whom, and why it matters to your purchase.
Timber in a damp cellar deserves a closer look too. Staining, decay, or insect damage can matter more here than elsewhere. Our article on hidden structural moisture problems in older homes explains why moisture and timber are so closely linked.
Access matters as much as anything. Steep steps, low headroom, poor lighting, or a cellar packed with belongings all limit what we can see. We’ll only go where it’s safe, and we’ll record anything we couldn’t inspect. Please don’t probe timber or pull back finishes yourself during a viewing.
Pumps, membranes, and paperwork
Some converted cellars have a membrane lining the walls and a sump pump to carry water away. If there’s one, ask what’s been installed, when, and whether it’s been serviced. We can note that it’s there and describe what we can see, but a standard home survey doesn’t test whether a pump works or confirm that the whole system is performing.
A waterproofing warranty is worth reading closely. Check what it covers, who issued it, whether it passes to a new owner, and whether the company still trades. Your conveyancer can advise on its legal value. It’s evidence of past work, not proof of the cellar’s condition today.
Turning the report into next steps
When the report arrives, separate three things: defects we’ve seen, areas we couldn’t inspect, and recommendations for further investigation. A visible leak needs a different response from a boarded wall with no sign of trouble.
A useful recommendation tells you what needs answering and who can answer it, such as a drainage check or a structural engineer’s view on an altered wall. If anything in the report isn’t clear, pick up the phone and ask us. That’s what we’re here for.
Questions about cellar surveys
Which survey is best for a house with a cellar?
For most houses with cellars, particularly older, altered, or converted ones, we’d recommend a Level 3 Survey (Building Survey). A Level 2 Survey (Homebuyer Report) can suit a conventional house in reasonable condition with a simple storage cellar. Tell us about the cellar and we’ll help you decide.
Does a dehumidifier mean there’s a damp problem?
Not necessarily. It may be used routinely or because of a known issue. Mention it to us, and ask the seller why it’s there and how often it runs, so we can consider it alongside what we see.
What if the cellar is full of the seller’s belongings?
We won’t move stored items, so ask the agent to have the cellar cleared as far as possible before the survey. If important areas stay hidden, we’ll record that, and we can talk about whether a second look is worthwhile.
Is a cellar listed as a bedroom definitely a bedroom?
No. The description needs checking against the building regulations paperwork, the physical space, and how it can safely be used. Your conveyancer can check the paperwork, while we’ll report on what we can see.
Should I visit again after heavy rain?
If the seller agrees and it’s safe, another look can be useful, and you can share what you notice with us. It won’t reproduce every condition, though, so don’t hold up the rest of your enquiries waiting for the weather.
What if I only want the cellar for storage?
Its condition still matters to the house above and to what you can safely store there. Tell us how you plan to use it, so our advice is in proportion. A defect affecting the structure shouldn’t be ignored just because you won’t live down there.
Tell us about the cellar
If you’re buying a house with a cellar in Liverpool or the North West, contact Trust Surveyors or call 0151 702 0123. Let us know the address, the age of the house, and how the cellar is used or has been converted, and we’ll recommend whether a Level 2 or Level 3 survey suits it before you book.
