Fascia capping means fixing a thin skin of uPVC over the front and underside of your existing timber fascia boards. Full replacement means taking the old boards off, checking what is behind them and fitting new ones. From the pavement the finished result can look identical, which is why the choice is so often made on price alone. It should be made on the condition of the timber, because capping is a good finish over sound wood and a bad one over wet rot. This guide sets out what each method really involves, where each belongs, and how we decide on a survey.
What capping actually is
A fascia is the board running along the foot of the roof slope, fixed across the ends of the rafters. It carries the gutter and closes the gap under the bottom row of tiles. Capping, sometimes sold as "over-fascia" or "cladding", uses a plastic cover that clips or screws over the existing board, usually with a channel at the top that tucks under the felt or the first course of tiles. A matching cover can go over the soffit too (the flat board closing the underside of the eaves overhang), and over bargeboards on the gable ends. Our explainer on fascias, soffits and guttering covers each part in turn if any of these terms are new.
The appeal is easy to see. Nothing is stripped off, so the work is quicker and tidier, there is less disturbance to the tiles above, and the plastic never needs painting again. The weak point is that the old board stays put, along with whatever is going on inside it.
What full replacement involves
With replacement, the gutters come off first, then the old fascia and soffit boards. That exposes the rafter ends (the timber feet of the roof), the wall plate they sit on and the back of the eaves for the first time in years. New boards are cut to length, fixed to sound timber, and the gutters are refitted on new brackets. A properly done job also gets new ventilation in the soffit and a check that the felt at the eaves is lapping down into the gutter rather than behind it.
The extra labour is not wasted effort. Replacement is the only method that lets anyone see the structure that the roofline is protecting. Our page on what happens during a roofline replacement follows a job through from scaffold to site clearance.
When capping is the sensible choice
Capping suits a roofline where the timber is dry, solid and firmly fixed, and the only complaint is the look. Typical cases are boards that were painted every few years by the previous owner and are now tired, a house where the paint has failed in patches but the wood beneath is hard, and a property where the board is sound but a poorly matched mixture of colours has built up over several repairs.
It also makes sense where replacement would mean disturbing something that is better left alone. An older roof whose bottom courses of tiles are brittle, or a roof that has already been patched repeatedly, can be damaged by the work needed to slide a new board in behind the tile edge. We always say so when this is the case. Our short answer on replacing fascias without removing tiles explains why it can usually be done, and when it cannot.
The test we apply is the same each time. Press a screwdriver or a thin blade into the board at several points, particularly at the joints, behind the gutter line and at the corners. Sound timber resists. Rotten timber crumbles, flakes or lets the blade sink in. If every point resists, capping is a reasonable option. If any of it gives way, the question changes.
When capping is the wrong answer
Wet rot spreads from wherever water sits. The causes are almost always a leaking joint, an overflowing gutter, a failed paint film or an open end grain that has soaked up water for years. Fix the board's surface and you have not fixed any of those. Cover a damp fascia with a plastic skin and you can trap the moisture against it, with little chance to dry out. Rot continues quietly under the cap, and you find out when the board has softened enough to pull the cap away from the roof edge.
The danger does not stop at the board. Rafter ends sit directly behind the fascia, and a fascia that has been wet for years often means rafter ends that have been wet too. If those are decaying, they can no longer hold the board firmly, and a capped roofline hangs on weakened fixings. Our guide to rotten fascia boards shows how the damage progresses and what a repair involves.
There is a second reason to avoid capping. A cap adds thickness at the front of the roofline, and gutters then have to be refixed on top of an already-fixed board with longer screws or brackets that reach through two layers. That is a weaker fixing than one made directly into a sound board. On a long gutter run in a Basingstoke winter, full of rain and leaf litter, it matters.
Soffits and the question of ventilation
Soffit boards in older houses are often plain solid board with no air gap, because the house was built before roof ventilation was a design point. A soffit cap over a solid board leaves the loft with no new air path. New soffit boards can include vents and, with replacement, we can fit them. Capping offers no such opportunity, because the plastic simply follows the shape underneath. The thinking behind it is set out in our guide to soffit ventilation.
Age matters as well. In houses built before the year 2000, an old soffit board is sometimes asbestos insulating board rather than timber. If there is any chance of that, nobody should drill, cut or break it, whether capping or replacing. Read our answer on whether your soffits could contain asbestos before any work starts. Some removal of that material needs specialist contractors, and we stop and test before disturbing a suspect board.
How the price compares
We do not publish a Beacon price list, because the sum depends on the house and a firm figure only comes after the survey. As an orientation only, one UK cost guide reports a typical range of £1,800 to £3,500 for a full uPVC roofline on a three-bedroom semi, and £3,000 to £6,000 for a detached house. Roofline scaffold is reported anywhere from £200 for a single bungalow elevation to £2,600 for a two-storey detached house scaffolded all round. These are typical UK ranges, not Beacon prices. Your fixed quote follows the survey, once we have seen the boards.
Capping tends to cost less in labour than replacement, because less is removed and there is less to make good. Scaffolding is the same either way, since the work is at height whichever method you choose. Some of the saving therefore disappears on a two-storey house. Where capping saves most is on a bungalow or low eaves, where access is simpler.
A cheaper job that has to be redone in a few winters is the dearest option. If the board will need replacing within a few years anyway, capping first means paying for the scaffold twice.
Colour, finish and how long it stays looking right
Plastic boards come in white, black, grey and woodgrain foils, and the cap is made in the same range. White is the commonest, and it is also the colour that shows dirt and algae soonest on a north-facing roofline under trees. Woodgrain and dark finishes hide the green film but can fade unevenly if they sit in strong sun all afternoon. None of that differs between a cap and a new board, so colour should not decide the method. What does differ is the edge detail. A cap leaves a visible step where it meets the wall or the end of a bargeboard, and a careless one shows a gap where the cover has been cut short. New boards are cut to run to the corner, so the joints are tighter and the line looks cleaner when the work is finished.
Gutters, brackets and the finished line
Whichever method you choose, the gutter is the part that tells you most about how the job went. A gutter that falls evenly to the downpipe, with joints that sit tight, stays clear of the roof edge and does not slop water behind the board. On a capped roofline, the fall can be hard to correct because the board underneath has already settled out of line. On a replaced roofline, new boards go on straight and the brackets can be set at an even fall from the start.
If your gutters are old or worn as well, it makes sense to do them with the fascias. Doing the boards and gutters in two visits means putting up scaffold twice. Our page on gutter replacement cost looks at what drives the figure.
How we decide on your house
We do not push one method. On the free survey we look at the roofline from the ground, then close up from a ladder or scaffold. We test the boards at the joints and gutter line, check the rafter ends where we can reach them, note any staining on the wall that shows water has been running behind the gutter, and photograph each finding so you can see it too.
Then the report says which method we would use and why. If your timber is sound, we will say capping is fine and give a fixed written quote for it. If it is not, we show you the photograph of the soft board and explain what replacement will involve. Whichever you choose, the price is fixed in writing before we start, and once the boards are up you hold our ten-year guarantee on the workmanship, on paper. The scaffold comes down and the old boards leave with us. Like-for-like roofline work is not normally notifiable, but if your job is, the paperwork is ours to deal with. A house that has been capped once and is now being looked at again is a common call, and we treat it the same way: test first, then recommend. For the full range of work on this part of the house, see guttering, soffits and fascias in Basingstoke. Our number is 01256 213956, and WhatsApp reaches the same people if you would rather send photos of your boards first.
