Non-standard construction

Horizontal joints show at each floor of a concrete block of flats. What does seeing the joint not prove about the fixings?

It does not prove how the floors are fixed, or that the fixings are sound or failed. Horizontal joints at each floor of a concrete block show a line on the elevation. The surveyor of one flat sees that line from the windows they can reach, not the bolts, the bearings or the neighbour's slab. A flat inspection does not inspect the block's external wall system. A joint is a prompt for a block-wide question, not a measurement of every fixing.

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

What is the fuller explanation?

Large concrete blocks often show a joint, a drip or a change of panel at floor level. That line tells you panels or slabs meet there. It does not show the bracket, the bearing length or the reinforcement. From one flat the surveyor may see the joint outside their own window and any crack or staining on their own balcony edge. They do not abseil the block and they do not enter the flats above and below. The external wall system of the block is outside a single-flat inspection. Writing a confident line about every fixing would invent access that did not happen.

Ask the firm to keep the wording at 'joint seen, fixings not seen'. Do not upgrade a straight joint into a pass, and do not upgrade a stained joint into a block-wide failure unless the report has evidence beyond your one elevation. Similar age on the estate is not a test result. If a landlord or a manager has a block report, your solicitor can ask for it. That document is not this survey. Your flat's internal condition can still be rated on its own without pretending the joints were opened.

What should you ask your surveyor?

Which joints could you see from this flat, and which elevations were out of sight?
Did you see any fixing, or only the line of the joint?
Are you keeping the block's external wall system outside this flat inspection?

What are the typical next steps?

Do not tell a lender the floor fixings were inspected.
Ask your solicitor whether a separate block report exists.
Describe the joint as a line you could see, not as a test of the bolts.

Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.

Also asked about this

If the joint is open, have the fixings failed?

Not proved. An open joint is an open joint. The fixing behind it was not measured from one flat.

Does a survey of my living room include the whole elevation?

No. A flat inspection does not inspect the block's external wall system. Other floors stay outside the visit.