Should I cap over my fascias or replace them?

Capping, also called overcladding or overboarding, fits a new cover over the existing fascia board. Replacement takes the old board off and fits a new one. Both work in the right conditions. The state of the timber decides which one you need.

What is the difference?

With capping, new uPVC covers go over the front and bottom of the old boards. FixMyRoof (2026) describes the cover as about 9mm thick and says it leaves the back and top of the old timber open to the dry air in the loft.

With replacement, the old boards come off, the timber behind them is checked and new boards go on. It takes longer, which is part of why it costs more.

When does capping make sense?

FixMyRoof (2026) says capping is a viable choice if the main aim is never to paint the fascias again, as long as the correct trims are used and it is fitted properly. Timber boards need repainting every three to five years, at about £300 to £800 each time (Book a Builder, 2026).

Capping fits boards that are firm and dry. Before you decide, check them from the ground.

• Press the timber if you can reach it safely. Soft or spongy wood is a sign the board needs replacing (Book a Builder UK).
• Look at the top edge of the board, where the tiles meet it.
• Do not assume flaking paint means rot. FixMyRoof warns that it is often mistaken for rot.

When does it need replacing?

FixMyRoof (2026) says full replacement is the better answer when there is any infestation or large areas of rot, including rot along the top edge of the board.

Book a Builder (2026) lists installing over rotten timber as a mistake. It traps moisture and leads to hidden decay that can spread into the rafters, and structural repairs afterwards can cost £1,000 or more.

What does each cost?

FixMyRoof puts capping at around half the price of full replacement. These are UK figures, read on 29 October 2026, and not a quote from us. Scaffolding and guttering are separate costs. The cost guide covers them.

One roofer’s warning about replacement

FixMyRoof’s author, a roofer with more than 30 years in the trade, argues that replacement done badly can leave a roofline weaker. His examples include plastic fascias fixed straight into old rafter ends without extra timber behind them, and gable-end mortar and ridge tiles loosened when the old timber comes off. He also says a badly fitted cap will usually just be a mess, with the roof structure left alone.

That is one roofer’s view, and he notes that he earns more from replacement. It is still a good reason to ask any firm how the new boards will be supported and fixed.

What should you ask before agreeing?

Checkatrade advises making sure each tradesperson prices the same scope of work. Ask each one:

• Are the old boards firm and dry behind the cover, and how was that checked?
• Which trims and fixings will be used?
• Is scaffolding or other access included?
• Are removal and disposal of the old boards included?
• Is guttering part of the price?