The short answer
Repair gutters when the fault is one joint, a loose bracket or a short cracked section on an otherwise sound, level run. Replace them when leaks or cracks appear along most of the run, the material is brittle or rusted through, the fall cannot be corrected, or the fascia behind is rotten. Patching a failing run mostly buys a season or two.
The rule of thumb
The simplest test is spread. A fault in one place on a sound run is a repair. Faults in many places mean the run itself is tired. Everything else in this answer is detail on that idea.
A gutter has three jobs: hold water, carry it at a fall to an outlet, and stay fixed to the building. A repair restores one of those where a single part has failed, so it suits a slipped bracket or a perished seal. Replacement is justified when the gutter can no longer do all three reliably, however many individual fixes you make.
Cost enters the decision, though it can mislead. The cheapest-looking option is often a series of repairs, each cheap, and the total can pass the price of new guttering within a couple of years. One national cost guide gives a typical figure for new guttering of £30 to £70 per metre (MyBuilder, 2026), which is useful for judging the size of the choice, though your fixed quote follows the survey.
Repair when
These situations usually respond well to repair.
- One joint weeps. A new seal and refixed clip often settles it. See our answer on a leaking gutter joint.
- A bracket has slipped or snapped. A replacement bracket and a corrected fall bring the run back to level.
- A short section is cracked. A matching length can be cut in, if the profile is still available.
- Debris is the real problem. Overflow with a clear, sound run after cleaning means the gutter was never failing.
- Metal has surface rust only. Cast iron or aluminium that has not corroded through can be cleaned, treated and repainted.
The condition that links these is a sound base material. If the metal is solid and the plastic still flexes, patching works because there is something sound to patch.
Timing helps too. A repair done in dry weather in late summer has time to cure before the winter rain, and sealant applied in the cold or damp often fails to bond. If you can wait for a dry spell and the leak is minor, put a bucket or a temporary tray under the drip and book the repair for settled weather. Where water is running down a wall or into the eaves, do not wait, because that soaking does more harm than the fault itself.
Replace when
Replacement is the better route in the following cases.
- Leaks along most of the run. Seals and unions have aged together, and one repair only moves the leak to the next joint.
- Brittle or sun-faded plastic. Pressing or refixing cracks it. New sections will snap the next time anything moves.
- Metal rusted through the base. Pinholes and flaking mean the section is thin, and filler only hides it.
- The fall cannot be fixed. If brackets will not hold because the fascia is soft, the run will keep pooling.
- Persistent overflow from undersizing. If the gutter is undersized for the slope it drains, it will spill in a downpour however sound it is. Our answer on why gutters overflow covers how to tell.
Age matters alongside condition, and so does the number of previous repairs. A run showing three or four patches, each at a different place, has already told you how it is going to behave. A plastic run beyond the 10 to 20 years suggested in one UK guide is a good candidate, and our note on how long gutters last gives the ranges by material.
The fascia behind decides a lot
Many gutter problems are really fascia problems. Brackets and clips need something to bite into, and if the board behind is wet, soft or split, new gutter will sag just as the old one did.
Check the fascia before you commit. Press a screwdriver into the lower edge and behind where the run has leaked. If it sinks in, the board needs cutting out or replacing, and it makes sense to renew the gutter at the same time. Doing both while access equipment is already in place saves paying for it twice, and it lets the new run be set to a proper fall against sound timber. Our page on soffits and fascias explains how the boards, soffit and gutter fit together.
Consent may be needed before a gutter or board changes material on a protected building. Ask B&NES first, and keep like for like where you can.
How we make the call
We look at the whole run before offering an opinion. That means checking the fall with water, pressing the fascia, examining joints and unions, and noting what the gutter is made of and how far it has aged. Photographs of each problem are part of the survey, which shows you the reasoning behind our advice.
Where a repair will last, the price we give covers that repair alone. When it will not, we explain what is failing and offer replacement as a fixed price in writing. We match material on older houses, so cast iron stays cast iron where that is the building's character, and a replacement section is chosen to suit the profile already on the wall. Where the gutter is plastic and the house is plain and modern, a like-for-like plastic run is usually the sensible answer.
Old cast iron that comes off is taken away, though you can ask to keep sound lengths for a shed or outbuilding, and we remove everything else we take down. The gutters, soffits and fascias service page lists what else we handle.
