Property types

What does ex-local-authority or system-built mean on a survey?

Ex-local-authority describes a former owner, not a method of building. Some of those houses are ordinary brick. Some are named systems such as PRC, BISF or no-fines concrete. A survey should say which construction it can see. Whether a lender will mortgage that system is the lender’s rule, not a condition rating.

Last reviewed 24 October 2026. Written for buyers in England and Wales unless a source says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.

Is an ex-council house a defect?

No. Former local-authority houses include some of the most ordinary brick semis in the country, and some of the most specific system-built ones. The survey treats the building. ‘Ex-council’ on a listing is tenure history. It does not belong in the condition column.

A buyer who only wants to know ‘will a bank lend?’ is asking a different professional. The survey can identify construction. The lender decides what to do with that identification.

What should the report say if the house is PRC, BISF or no-fines?

It should use a name only if the surveyor has a basis: the look of the panels, the frame, the thickness, sometimes the estate. It should say when the type is uncertain. PRC houses have concrete panels and a history of reinforcement corrosion; a visual survey can see cracking, spalling and previous repairs, and cannot see every bar. BISF houses have a steel frame and often replacement cladding; the survey sees the cladding and the signs at openings, not the whole frame. No-fines concrete is a solid cast wall without the usual stones; it is not a cavity and it is not repaired like one.

Those sentences are orientation, not a diagnosis of the address you are buying. The paragraph in your report outranks this page.

What if the seller says it was repaired under a scheme?

Ask for the paperwork: which scheme, which address, which year, which installer. A survey can see whether the outside looks like a repaired system or like the original panels. It cannot authenticate a missing certificate. Your solicitor asks for the paper. If the paper and the walls disagree, that disagreement is the thing to resolve before exchange, not after.

A repaired system is not ‘standard construction’ just because the concrete was covered. Say what is there when you speak to a lender.

Why do survey and mortgage decisions come apart on these houses?

A condition rating describes a defect or a limit. A lender’s valuation describes whether they will lend, and on what terms, on a construction they may keep a list of. You can have a house in fair condition that a particular lender will not mortgage, and a house with a rating 3 that another lender will consider. MoneyHelper’s point, used on our valuation guide, is that a mortgage valuation is not a structural survey. The converse is also true. This survey is not a mortgage offer.

If the construction is unclear, say so to the lender early. Discovering it the week of exchange is how sales fall apart. That is a timing point, not a reason to panic, and not a statistic.

Common questions

How do you know it is ordinary brick?

Wall thickness, bond, a cavity at the reveal, and the surveyor’s experience of that estate. If they are sure, they will say conventional cavity or solid brick. If they are not, they should not tidy the doubt away. Ordinary brick does not need a system-build investigation.

The PRC house has no cracks. Is the reinforcement fine?

Absence of cracks is encouraging and not a scan of the steel. Carbonation and corrosion can be investigated by a specialist if you or the lender need that certainty. The home survey does not drill the panels as standard. Do not drill them yourself.

The BISF house has new brick cladding. Is the steel frame irrelevant?

No. Cladding changes the outside and can be part of a repair. The frame is still the structure. Ask whether the surveyor could see any evidence of the frame at the eaves, the openings or the roof space, and what they could not see.

Can you insulate a no-fines wall as if it were a cavity?

There is no cavity to fill. No-fines is a solid concrete wall. Insulation is a different specification, and a bad one traps moisture. The survey will not design it. Take advice that names this construction.

What is an Airey house?

A postwar system with precast concrete columns and panels. The public concern has been the columns. A survey looks for the tell-tale look and for cracking or previous repair. Confirmation, if you need it, is a specialist familiar with the system, plus the papers. This sentence is not that inspection.

The neighbour’s identical house got a mortgage. Will yours?

Not from their mortgage. Lenders change criteria, and two houses on one estate can be different types, or one may have been repaired. Ask your lender about this address. Bring the survey’s construction note.

The surveyor declined the job. Is the house unsaleable?

It means that firm will not inspect it, often because of the construction or their own competence. Another firm, often with Level 3 experience of system buildings, may accept. Unsaleable is a market and lending question. It is not implied by one refusal to quote.

How is this different from the non-standard construction guide?

That guide is about the RICS idea of unusual construction and why Level 1 and 2 are aimed at conventional homes. This one is about former local-authority houses and the named systems buyers actually meet. Read both if the report uses the phrase non-standard. Do not read either as a lender’s list.

Sources

Key facts

Owner is not fabric: Right to buy and later resales do not change the walls. The survey reports the walls.
Named systems: PRC (precast reinforced concrete), BISF (a steel-framed system), Wimpey no-fines, Airey, Unity, Orlit and Laing Easiform are examples buyers meet. The name is a start. Condition is the inspection.
Repairs schemes: Some concrete systems were repaired under licensed schemes. A repair is only as good as the evidence that it was done to that house. The survey does not invent a certificate.
Lenders: Criteria differ and change. This page does not list accepted or refused types. Ask the lender before you rely on a mortgage in principle that never asked the question.
RICS level: Unusual construction is a reason RICS gives for Level 3. If the firm can see it is a conventional brick house that happens to have been council-owned, Level 2 may be what they offer. The ownership is not the trigger.