How much does it cost to soundproof a room?
Soundproofing is priced by the surface area treated. Enter the wall, floor or ceiling area below for an estimate.
How soundproofing works
- 1Mass and separation
Effective soundproofing combines mass (dense acoustic board), absorption (mineral wool) and decoupling (resilient bars).
- 2Treat the whole path
Sound flanks around gaps — treat the full wall/floor/ceiling and seal service penetrations, or the weak point dominates.
- 3Meet the standard
Between flats and in some HMOs, building regulations set minimum sound insulation — build the system to reach it.
Soundproofing is an easy line to forget and an expensive one to retrofit. On any flat conversion it's a building-regs requirement, not an optional extra — so it belongs in the schedule from day one.
Soundproofing costs (indicative)
| Element | Per m² | Notes |
|---|---|---|
| Wall (acoustic system) | £40 – £90 | Bars, wool, acoustic board, skim |
| Ceiling (between flats) | £50 – £100 | Independent/resilient ceiling |
| Floor (acoustic build-up) | £45 – £95 | Underlay/deck over joists |
| One party wall (~12 m²) | — | £500 – £1,100 |
Building regs set sound-insulation standards between flats/HMO rooms — treat to the required level.
Frequently asked questions
How much does it cost to soundproof a room?+
Soundproofing typically costs £40–£90 per m² of wall, floor or ceiling treated, including the acoustic system and re-skim — so one party wall (~12 m²) is roughly £500–£1,100.
Do HMOs and flats need soundproofing?+
Conversions creating flats (and some HMO layouts) must meet building-regulation sound-insulation standards between units. Budget acoustic separation into any conversion from the outset.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.