Buying a flat: which survey and what to check

For most flats, a RICS Level 2 Home Survey is the right choice, while a Level 3 Building Survey suits flats in older conversions, period buildings or blocks in poor condition. Just as important, buying a flat means checking the building, the lease, service charges and fire safety, because shared repairs to the roof, structure or cladding can cost you far more than anything inside your own front door.

Key points

• A Level 2 suits most flats; choose a Level 3 for conversions, older or poorly maintained buildings.
• The surveyor inspects your flat closely but only sees the wider building from accessible areas.
• Your conveyancer checks the lease, service charges, major works and fire safety information.
• Together, the survey and legal checks give you a full picture of the costs you are taking on.

Which survey do you need for a flat?

The RICS Home Survey Standard offers three levels. For flats:

• Level 2 Home Survey - the usual choice for flats in purpose-built blocks of conventional construction, or well-kept conversions.
• Level 3 Building Survey - better for flats in Victorian or Georgian conversions, listed buildings, unusual construction or blocks showing signs of neglect.
• Level 1 Condition Report - a basic option for a modern flat in good condition, but with little advice. See is a Level 1 Condition Report worth it?

Our Level 2 vs Level 3 guide covers the decision in more detail.

What does a surveyor inspect in a flat?

The surveyor inspects the flat itself in the usual way: ceilings, walls, floors, windows, doors, kitchens and bathrooms, and visible services. For the wider building, they will typically look at:

• The main walls, roof and windows as seen from the grounds and from within the flat.
• Common areas they can access, such as entrance halls, stairs and corridors.
• The roof space if it is directly accessible from your flat and safe to enter.
• Visible signs of problems in the building, such as cracking, damp staining or poorly maintained cladding.

They will not normally enter other flats, go onto flat roofs, inspect plant rooms or carry out a full survey of the whole block. If the building looks like it needs significant work, the report will usually flag it so you can ask questions about planned repairs and service charges.

Common issues surveyors find in flats

• Damp and condensation, especially in basement flats, top-floor flats under flat roofs and poorly ventilated bathrooms.
• Leaks from flats above, shown by staining on ceilings.
• Sound insulation problems, particularly in conversions.
• Windows needing replacement, which may be the leaseholder's or the freeholder's responsibility depending on the lease.
• Communal repairs, such as roof coverings, gutters or external decoration that look overdue.
• Fire safety concerns, such as missing fire doors or obvious gaps in fire stopping in common areas.
• Alterations in conversions, such as removed walls or a loft extension in the top flat, which may need consents.

What your conveyancer should check

Many of the biggest risks in a flat purchase are legal and financial rather than physical. Your conveyancer will usually look at:

The lease

• Lease length. Shorter leases can be harder to mortgage and more expensive to extend. Many lenders want 80 years or more remaining, but requirements vary. Leasehold reform legislation has been passed, but some changes may not yet be in force, so ask your conveyancer about the current position.
• Ground rent and review clauses.
• Repair obligations. Who is responsible for windows, the roof, structure and common parts.
• Restrictions, such as on pets, subletting or alterations.

Service charges and major works

• Current service charges and recent accounts.
• Any planned major works, and whether there is a reserve fund to pay for them.
• Disputes with the freeholder or managing agent.

This information usually comes from the management pack provided by the managing agent or freeholder.

Fire safety and cladding

For some blocks, particularly taller buildings or those with cladding, there may be fire safety information to review. This can include an EWS1 form, which some lenders request, and documentation under the Building Safety Act 2022 about who pays for remediation. Your conveyancer will advise based on the building's height and history.

How the survey and legal checks work together

Your survey and your conveyancer's enquiries complement each other. If the surveyor notices a tired roof or failing windows, your conveyancer can ask whether repairs are planned and how they will be funded. If the management pack mentions major works, the surveyor's report can help you judge how urgent they are.

Pass your survey report to your conveyancer as soon as you have it. Our guide on how to read your survey report can help you pick out the points to raise.

Flats in new build blocks

If the flat is brand new, a snagging inspection is usually more appropriate than a Level 2. See do I need a survey on a new build home? for details.

Flats in period conversions

Flats in converted Victorian or Edwardian houses can be lovely, but they combine old structures with newer alterations. Common issues include sound transfer between floors, shared drainage, and damp in solid walls. A Level 3 often makes sense here. See surveys for Victorian and period homes.

Do you need a valuation?

Your lender will value the flat for its own purposes. If you are buying with cash, or want your own view on value, you can add a valuation to a Level 2. See Level 2 survey with valuation and our valuation page.

Get a survey booked on your flat

Book A Surveyor finds a local RICS or RPSA regulated independent surveyor, agrees a fixed price, arranges access with the estate agent and takes payment, so the survey is booked without you chasing quotes. See how it works or get a fixed-price survey booked.

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