In 40 seconds
Soundproofing a home in the UK usually costs roughly £30–£100 per square metre for a wall, with a single party wall typically landing around £900–£2,000 and a full room — walls plus floor or ceiling treatment — commonly £2,500–£6,000. Floors and ceilings between flats are the most involved, often £5,000–£12,000. The figure depends on how much noise you need to block, whether it is airborne (voices, TV) or impact (footsteps, banging), and the system used — acoustic mineral wool, resilient bars or clips, mass-loaded vinyl and acoustic plasterboard each add cost and performance. No single product makes a wall silent; soundproofing works by adding mass, separation and absorption together. The honest answer is always a range, because it depends on your build and your noise problem.
Most soundproofing advice online is published by firms selling one product, so the claims tend to be optimistic and the costs vague. The pages below give honest cost ranges, explain how walls, floors and ceilings are actually treated, set out what works against neighbour noise, and name the source for every figure — before you take a single quote.