Subsidence, settlement and heave
A line of small filled holes looks like helical-bar plugs. What has the survey not been shown about the design of that repair?
The design. A line of small filled holes that looks like helical-bar plugs has not come with the design of that repair. The survey has recorded the look of the plugs. It has not been shown a drawing, a bar length, a spacing rule or an engineer's specification. Looking like helical bars is an appearance. The design is the document that says what was specified for this crack. That document was not part of the inspection. The survey cannot supply it from the size of the holes.
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?
Helical bars are twisted stainless rods, grouted into a bed joint so a crack is stitched and the masonry can act together again. The plugs are the filled ends of those holes, set in a line. What you cannot see is the length of bar, the number of courses, the tie into sound brick, or whether anyone designed it for this crack rather than copying a spacing from another job. The surveyor can say the holes look like that system.
Ask the surveyor to keep the phrase as the appearance of plugs, not as an approved repair. Ask the solicitor whether the seller has a specification, a guarantee or a drawing, and read what crack it refers to. Do not tell a lender the stitch was designed because the holes are in a neat line. If the design matters, it has to be produced or the repair has to be assessed by someone who will investigate it. The home survey has not been shown that design.
What should you ask your surveyor?
- Are the filled holes only recorded as looking like helical-bar plugs?
- Were you shown any drawing or specification for the bars?
- What part of the design is simply not in the report?
What are the typical next steps?
- Describe a line of holes that looks like helical-bar plugs.
- Do not invent the design the survey was not shown.
- Ask the solicitor for any specification or drawing of the repair.
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 holes are evenly spaced, is that the design?
Even spacing is still an appearance. It might match a usual layout, and it might not be what was specified here. The survey was not shown the design, so the spacing does not become that document. The survey stops at the apparent bar plugs and does not add any further conclusion.
Can you assume stainless bars because the plugs look tidy?
No. Tidy plugs do not identify the metal, the length or the grout. The survey has not been shown the design, and a neat finish is not a specification for the bars inside the joint. Nothing in this visit settles the apparent bar plugs beyond the lines already set out.