In 40 seconds
Replacing the fascias and soffits on a typical UK house usually costs roughly £1,500–£4,000+, commonly around £2,250 for a terraced home and up to about £4,250 for a detached property before any extras. Installed costs run roughly £100–£185 per linear metre for fascia and soffit, and doing fascia, soffit and guttering together is often around £60–£120 per metre because the work shares scaffold and labour. For most standard houses a like-for-like replacement is treated as maintenance and needs no planning permission, but the work happens at height, so it is normally done from scaffolding or a tower under the Work at Height Regulations. The honest answer is always a range, because it depends on your roofline length, property height and material.
Most roofline guidance is published by companies fitting it, so the numbers tend to be optimistic and the rules glossed over. The pages below give honest cost ranges, explain what fascias and soffits actually do and when they fail, compare the materials fairly, and set out the scaffolding and planning rules — before you take a single quote.