Roofs and flat roofs
A cast-iron gutter is cracked at one joint and the rest of the run looks original. Has the survey specified a whole new plastic system?
No. The survey has not specified a whole new plastic system. It has recorded a crack at one joint of a cast-iron gutter, with the rest of the run looking original. That is a local defect at a joint, not a design for replacement in plastic. Original lengths can remain, be repaired, or later be renewed, and the survey has not chosen among those. It has not tested every other joint, so a tidy look along the run is not a pass for the whole gutter. The finding stops at the crack that was seen.
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?
Cast-iron gutters often fail first at a joint, where movement, a failed bolt or old putty lets the metal crack. The rest of an original run can still be serviceable, or it can be thin in ways a glance does not show. Specifying plastic is a choice about material, brackets and appearance, sometimes relevant on a period house, and it is not what a visual note of one crack decides. The survey describes the joint. It does not write the specification.
A rainwater contractor can say whether that joint can be repaired, whether one length should be renewed in metal, or whether a wider replacement is actually warranted. Ask for that in writing if you need it. Tell the solicitor the report has not required plastic. The survey has not priced a new system and has not said the fascia must be replaced to suit one. Leave the cracked joint as found rather than forcing it shut on a viewing.
What should you ask your surveyor?
- Which joint was cracked, and what of the rest did you actually see?
- Did you specify any replacement material, or only record the crack?
- Were the brackets and the outlet included, or left unremarked?
What are the typical next steps?
- Keep the note as one cracked cast-iron joint.
- Ask a rainwater contractor about repair of that joint before any full replacement.
- Do not tell the solicitor the survey has required a plastic system.
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 iron is rusty all along, has plastic been specified?
Rust along a run is still not a specification. The survey noted a crack at one joint and an original-looking gutter. It has not chosen plastic, even if the iron looks tired. No later decision about the plastic was made, and this visit did not supply one.
Can the cracked joint be left if it is not dripping today?
A dry day does not close the crack. The survey recorded the joint and did not say it can be ignored because it was not dripping at the visit. Repair advice is still a contractor's job. What happens next for the joint is outside this note and was not settled here.