Three things usually start this. A dark streak running down the render below a gutter joint. A soffit board that has gone soft and slightly furry at one corner. Or a roofline company knocking on the door offering to do the whole house while they are working next door.
If the timber behind the boards is sound and the problem is confined to one or two lengths, repair it. If the fascia is rotten where the gutter brackets screw into it, or the soffit is decaying at the rafter feet, replacing the roofline in full is the cheaper decision over ten years — even though it costs several times more today. The difficult part is that you usually cannot tell which situation you are in from the ground.
Built before 2000? Some older properties contain asbestos (in textured coatings, panels, soffit boards or floor tiles). Don't drill, sand or break anything you're unsure about. Get an asbestos survey before work starts. See HSE's advice for homeowners.
What each part actually does
The three are treated as one job because they sit together, but they fail for different reasons.
The fascia is the vertical board along the roof edge. It carries the bottom row of tiles and, critically, it is what the gutter brackets are screwed into. A fascia does structural work. When it softens, the gutter stops holding its fall and starts holding water.
The soffit is the horizontal board underneath, closing the gap between the wall and the roof edge. Its job is to keep birds and weather out while letting the roof void breathe. Modern soffits are vented for exactly that reason; older timber ones often are not, which is why lofts in houses of a certain age get condensation problems that look like roof leaks.
The guttering is the part everyone notices, and usually the part that is blamed. Often it is the symptom rather than the cause: a gutter that has dropped at one end has generally dropped because the timber it is fixed to has gone.
How to work out which you need, from the ground
You will not get a definitive answer without a ladder or a scaffold tower, and if you are not confident working at height, do not try. But there is a lot you can tell standing in the garden with a pair of binoculars.
Signs a repair will do
One gutter joint dripping, with the rest of the run sitting level and dry
Paint flaking on otherwise firm timber
Algae and staining on uPVC boards that are still rigid and properly seated
A single cracked gutter section after a storm or a ladder knock
Blocked downpipe, water backing up over the edge in heavy rain
Signs you are looking at replacement
The gutter line visibly sags, or water sits in it rather than running
Gutter brackets have pulled away, or screw heads are standing proud
Soffit boards sag, gap at the wall, or show daylight from inside the loft
Timber that is dark, soft or crumbling at the corners and joints
Birds nesting behind the soffit — they get in through a gap that is already there
Persistent damp on the internal wall directly below the eaves
The internal sign is the one to take seriously. Water getting behind a failed roofline does not stay at the roofline. It runs down the cavity and shows up as a damp patch in a bedroom corner, and by the time it is visible inside, the timber outside has usually been wet for a long time.
What it costs
Every figure below is indicative. Roofline pricing varies more by access than by material — a bungalow you can reach off a tower is a fundamentally different job from a three-storey terrace that needs a scaffold licence from the council.
Job
Indicative cost
Clear and flush gutters, typical semi
£80–£150
Replace one gutter section or joint
£100–£200
Replace a single rotten fascia board length
£150–£350
Full uPVC roofline, terraced house
£1,200–£2,000
Full uPVC roofline, three-bed semi
£1,800–£3,000
Full uPVC roofline, detached
£2,800–£5,000+
Scaffolding, if required
£600–£1,500
Two things push a quote up that homeowners rarely anticipate. The first is scaffolding: on anything above single storey, it is often a separate line and can be a fifth of the total. The second is what is found once the old boards come off. Rafter feet that have been sitting under a leaking gutter for years need cutting back and splicing, and that is carpentry, not roofline fitting.
The capping shortcut, and why it matters
There is a cheaper way of doing a roofline, and you will be offered it. Rather than removing the old timber, the installer screws or pins uPVC capping over the existing fascia and fits a new gutter to that.
Done over sound, dry timber by someone who has checked it properly, capping is a legitimate technique. Done over timber that is already wet — which is the reason most people are getting quotes in the first place — it seals the decay in, hides it from view, and buys perhaps five years before the new gutter starts pulling away from boards that have quietly turned to compost underneath. It is the single most common complaint about roofline work, and it is almost impossible to spot from the ground once the job is finished.
The protection is straightforward: ask the question directly. Is this a full replacement or a cap-over? If it is a cap-over, what did you find when you checked the timber underneath, and can you show me a photograph of it? A contractor doing the job properly will have looked. One who has not will change the subject.
Materials, briefly
uPVC covers the overwhelming majority of UK roofline work. It does not rot, does not need painting, and is the cheapest to fit. It does discolour on south-facing elevations, and cheap board can go brittle.
Timber is the right answer on a listed building or in a conservation area, and sometimes the only permitted one. It costs more and needs repainting on a cycle, but it can be repaired in sections rather than replaced wholesale.
Aluminium guttering is a real middle option on larger or period properties — dearer than uPVC, longer-lived, and it holds its shape over long runs in a way plastic does not.
If your house is listed or in a conservation area, check before anyone orders materials. Swapping cast iron for uPVC on a visible elevation can need consent, and putting it back afterwards is an expensive way to learn that.
What to do in the next 30 minutes
Walk the full perimeter of the house and look up at every gutter run. Note where it sags, where it stains and where it drips.
Go into the loft with a torch on a bright day and look at the eaves. Daylight where there should not be any, or damp rafter feet, tells you more than anything visible outside.
Photograph every problem area now, before you get anyone out. It makes quotes comparable and it dates the condition.
Check when the gutters were last cleared. If the answer is “no idea”, that is the first job, and it may be the only one.
Get three quotes and insist each one states whether it is a full replacement or a cap-over.
Once you know what you have, write it down somewhere that survives a house move — roofline material, install date, installer, and any guarantee. Compare quotes through Trade Pilot, and keep the paperwork and the photographs against the property in Home+ so the next person to ask “when was this last done?” has an answer.
FAQ
How long do uPVC fascias and soffits last? Properly fitted over sound timber, a uPVC roofline is generally expected to last a couple of decades or more, and manufacturer guarantees often reflect that. Fitted over decayed timber as a cap-over, that expectation does not apply — the failure comes from behind the board, not from the board itself.
Do I need scaffolding to replace guttering? Not always. Single-storey work and some accessible semis can be done from a tower. Anything higher, or anything where the contractor needs both hands and a clear working platform, will usually need scaffolding, and it should be a visible line on the quote rather than a surprise.
Can I replace a fascia board myself? Replacing a single length is within reach of a confident DIYer at ground-floor height. Above that, you are working at height, on a structure carrying the bottom row of roof tiles, and a mistake takes tiles with it. The cost of a repair is rarely worth the risk.
Does replacing the roofline need planning permission? For a like-for-like replacement on most houses, no. Listed buildings and conservation areas are the exception, and changing material or appearance on a visible elevation is where problems arise. Check with your local authority first.
Why is my new gutter still overflowing? Usually fall, blockage or capacity. A gutter needs a consistent slope towards the downpipe; if it was refitted to the same old brackets on the same tired fascia, it may not have one. Overflowing only in heavy rain can also mean the downpipe is undersized or partially blocked lower down.
Should I have the gutters cleared before getting quotes? Yes, if you safely can. A surprising number of “failed gutters” are full ones, and a clear gutter lets you see whether the run actually holds a fall or not.
