Will the surveyor read my lease?

No. The surveyor flags the physical matters that the lease must be checked against — repair liability, demise boundaries, apportionment — and your conveyancer reads the document.

Can the roof of a block be inspected?

Where safe access is available, yes. Where it is not, the report says the roof was not inspected rather than implying it was.

Is a flat survey worth it on a new-ish block?

Often yes. Newer blocks fail on detailing, water ingress at balconies and communal plant rather than on age, and those are exactly the items a service charge funds.

Flat survey (leasehold residential unit)

Flat survey

A survey of the flat you are buying and the block it sits in: your demise, the common parts, and the major works your service charge will fund.

Ask KJ about a flat purchase 01706 318200

Last reviewed 31 August 2026

What does a flat survey cover?

A flat survey inspects the unit you are buying and, so far as access allows, the parts of the building your service charge pays for: roof, structure, common parts, and external fabric. It reports condition, identifies likely future major works and sets out the physical questions your conveyancer should put to the seller and the managing agent. It does not interpret your lease.

At a glance

Two subjects: The flat itself and the building around it.
Usual level: Level 2 for conventional flats; Level 3 for conversions and older blocks.
Major works: Likely future expenditure flagged so section 20 costs are not a surprise.
Access limits: Roofs, risers and plant rooms are only reported where access is granted.

You are buying a share of a building

The condition of the flat is only half the risk. Roof coverings, external walls, communal windows, lifts, plant and drainage are shared, and the cost of putting them right is recovered through the service charge under the terms of the lease.

A survey that ignores the block gives a comfortable but misleading picture. The purpose of inspecting the common parts is to estimate the exposure you are taking on, not just the room you will sleep in.

Roof age and covering, where it can be seen safely
External walls, balconies and communal windows
Common parts: stairs, corridors, lighting, fire doors where visible
Evidence of past or pending major works programmes

Conversions behave differently from purpose-built blocks

A flat carved out of a Victorian house carries the issues of that house — solid walls, original roof, shared drainage — plus the issues of the conversion itself: sound transmission, fire separation between units, and services routed through other people's space.

Purpose-built blocks tend to have better-defined structure and management but bring their own list: cladding and external wall systems, communal heating, lifts and long-term plant renewal.

What the surveyor hands to your conveyancer

The physical findings turn into questions: who repairs the roof under the lease, whether the last major works were consulted on properly, whether the service charge reserve reflects the condition seen, and whether any external wall enquiries apply to the building.

Answering those questions is legal work. The survey's job is to make sure the right questions are asked before exchange rather than after completion.

Who this is for

A good fit if

Buyers of leasehold flats in purpose-built blocks and converted houses
Buyers who want the block, not just the unit, assessed
Owners considering a sale who want to know what a buyer's surveyor will find

Not the right choice if

Lease interpretation, service charge disputes or enfranchisement advice
Anyone needing a formal valuation figure without commissioning one
Buildings where no access to any common part can be arranged

Making the survey worth the fee

Three practical steps before the visit.

1.Request access to the common parts
Ask the agent for access to the roof space, plant room and corridors. Refused access is itself worth knowing.
Apartment surveys
2.Ask for the service charge history
Past accounts and any section 20 notices tell you how the building has actually been maintained.
Leasehold valuations
3.Decide the level with the building's age in mind
A 2015 block is not a 1900 conversion. Age and alteration drive the level, not the flat's floor area.
Compare survey levels

When to bring in a specialist

External wall systems, cladding and fire safety: the building owner's fire engineer or a competent fire risk assessor.
Suspected asbestos-containing materials: instruct a competent asbestos surveyor before any disturbance or removal.
Electrical installations, gas, drainage and fire safety: instruct the relevant competent professional for testing and certification.
Lease terms, title, tax and financing: your conveyancer or adviser, not your surveyor.

Common questions

Limitations and sources

Any survey is limited to what the surveyor can see and safely reach on the day. Areas behind finishes, under floors or beneath stored belongings are not opened up.
Common parts are reported only where access is granted on the day.
The lease is a legal document; nothing in a survey interprets it.
Nothing on this page is a professional opinion about a specific property. KJ Surveyors has not inspected your building, and general guidance cannot replace an inspection and report.

Source: RICS · checked August 2026

Source: LEASE · checked August 2026

Source: UK Government · checked August 2026

Last reviewed 31 August 2026.

Where to go next

apartment surveys — the same service framed for purpose-built blocks.
maisonette surveys — where the demise includes more of the structure.
leasehold valuations — for lease extension and enfranchisement figures.

Buying a flat? Tell KJ about the block

Age, number of storeys, conversion or purpose-built, and anything the agent has said about major works. KJ will explain what the survey should reach.

KJonline

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Hi, I'm KJ. Tell me about the property or the surveying advice you need and I'll help you work out the right next step.

KJ gives general guidance only and has not inspected your property. A professional opinion follows an inspection by a surveyor.