How to Price Soundproofing: Labour, Materials and Margin Guide

Quick Answer: UK soundproofing typically prices at £60-£150 per m² supply-and-fit for a standard treatment, rising to £120-£250 per m² for a high-performance independent stud or floating floor system. A single party wall in a terraced house is usually £1,800-£5,500, a ceiling £1,500-£4,500, and a full room £6,000-£15,000+. Where soundproofing forms part of a material change of use or new dwelling, it must meet Building Regulations Approved Document E: airborne insulation of at least 45 dB DnT,w + Ctr and impact insulation no greater than 62 dB L'nT,w for conversions (43 dB / 64 dB targets apply to certain new-build separating elements).

Summary

Soundproofing is sold on a promise — "it'll be quieter" — and that is exactly why it is dangerous to price. Acoustic performance follows mass, isolation, and absorption, and customers routinely expect a thin treatment to deliver studio-grade results. The job is rarely "stick something on the wall"; it is build-up of mass and decoupling, which steals room volume, raises floors, and lowers ceilings. Get the expectation and the spec wrong and the customer hears the difference between "quieter" and "silent" — and disputes it.

The biggest pricing mistakes are: quoting a single-layer treatment when the noise problem (especially low-frequency music or impact noise) needs a decoupled system, ignoring flanking paths so the treated wall performs but sound still travels through the floor or ceiling, forgetting that resilient bars and independent studs eat 50-125mm of room depth, and not allowing for the knock-on trades — re-skimming, re-skirting, moving sockets, refitting doors. Most "one wall" jobs become a room job once flanking is understood.

This guide covers party walls, ceilings (impact noise from above), floors (impact noise to below), and full-room studio treatments. It explains where Building Regulations Part E sets a legal minimum (conversions and new dwellings) versus where the customer just wants peace and quiet (no statutory target, but manage expectations carefully).

Key Facts

• Acoustic mineral wool (higher density, e.g. 60-100 kg/m³ slab) — £8-£20 per m² (for stud/cavity infill)
• Mass-loaded vinyl (MLV, ~5-10 kg/m²) — £15-£35 per m²
• Resilient bars (acoustic mounting channel) — £3-£7 per linear metre
• Acoustic plasterboard (dense, 12.5-15mm) — £8-£18 per board; specialist high-density up to £30
• Soundproof board / dense composite panel systems — £25-£70 per m²
• Damping compound (visco-elastic, e.g. between two boards) — £10-£25 per m² of treated board
• Independent metal/timber stud framing — £6-£14 per m² in materials
• Acoustic sealant / flanking strip — £6-£14 per tube; critical at all perimeters
• Acoustic floor deck / resilient overlay (floating floor) — £20-£60 per m²
• Resilient floor cradles and battens (joist isolation) — £25-£60 per m²
• Carpenter / dry-liner day rate — £180-£300 regional, £250-£400 London
• Plasterer (re-skim after boarding) — £180-£300 regional, £250-£400 London
• Typical wall depth lost — 50-125mm depending on system
• Typical ceiling drop lost — 50-150mm
• Building Regs Part E airborne minimum (conversions) — 43 dB DnT,w + Ctr; 45 dB commonly specified for safety margin
• Building Regs Part E impact maximum (conversions) — 64 dB L'nT,w; new separating floors lower
• Pre-Completion Testing or Robust Details — required to demonstrate Part E compliance on new dwellings
• VAT — 20% standard; 5% may apply on qualifying conversions creating dwellings (VAT Notice 708)

Quick Reference Table

Detailed Guidance

Party Walls — Mass Plus Decoupling

The most requested job: a terraced or semi-detached neighbour's TV, voices, or music coming through the separating wall. The two routes are mass-on-the-wall (cheaper, modest improvement) and decoupled (more effective, deeper).

• Resilient bar system — bars fixed horizontally across the existing wall, acoustic mineral wool in the cavity, two layers of dense/acoustic plasterboard (ideally with a damping compound or green-glue-style layer between), all perimeters sealed with acoustic sealant. Loses ~50-75mm. Good airborne improvement.
• Independent stud system — a new stud wall built with a small gap, not touching the existing wall, fully decoupled, mineral wool filled, double-boarded. Loses ~100-125mm. Best airborne result, especially against low-frequency music.

Flanking is the killer. If the floor and ceiling carry sound around the treated wall, the wall alone underperforms. Inspect and warn the customer in writing before quoting a wall-only job.

Pricing example (regional, party wall, resilient bar two-board system, ~12m²):

Ceilings — Impact Noise From Above

Footsteps, dropped objects, and dragged furniture from a flat above are impact noise — the hardest to stop. A simple board-over does little; the ceiling must be decoupled.

• Resilient bar + acoustic board — bars under the existing joists/ceiling, mineral wool between, double dense board below. Drops ~50-100mm.
• Independent ceiling — a fully separate ceiling on its own joists or a resilient hanger system, not touching the structure above. Drops ~100-150mm; best for impact.

Where the noise is impact from above, the most effective fix is treating the floor above (the source), not the ceiling below — but that requires the upstairs neighbour's cooperation, which is rarely available. Set expectations accordingly.

Floors — Impact Noise to the Room Below

Where your customer is the one generating impact noise (or a conversion must meet Part E for the flat below), a floating or resilient floor isolates the walking surface from the structure.

• Resilient overlay / acoustic deck — a dense acoustic board or rubber-backed deck laid floating over the existing floor. ~20-40mm build-up. Door undercuts and threshold transitions needed.
• Battens on resilient cradles — joists/battens sit on rubber cradles, mineral wool between, new floor deck on top. ~50-90mm build-up. Better isolation, more disruption.

Pricing example (regional, floating acoustic floor, ~14m²):

Full Room — Studio and Home Cinema

A genuine "soundproof room" treats all six surfaces: party and internal walls, ceiling, and floor, plus the weak links — doors (acoustic door or seals), windows (secondary glazing), and ventilation (acoustic ducting/baffles, because you cannot just seal a room airtight). This is a major build, often 8-15 days, with multiple trades.

Critical points to price in:

• Decouple every surface — one rigid bridge ruins the whole room
• Acoustic doors — a normal door is the weakest point; £300-£1,500 for an acoustic doorset
• Secondary glazing — £250-£700 per window for an acoustic secondary unit
• Ventilation — sealed rooms need acoustic-attenuated ventilation; never sell an airtight box
• Flanking and mass at junctions — wall-to-floor and wall-to-ceiling junctions must be sealed and isolated

Where Part E Bites — Conversions and New Dwellings

Soundproofing is only legally required in specific situations, and this distinction drives both spec and price:

• No legal target — a homeowner wanting their bedroom quieter from a neighbour. You choose the spec to meet their expectation; manage it in writing. No testing required.
• Material change of use / new dwelling — converting a house into flats, or building separating walls/floors between new dwellings, triggers Approved Document E. The separating elements must meet airborne and impact targets, demonstrated by Pre-Completion Testing or by using Robust Details. Failing a sound test means re-doing the work — price the test and a contingency.

Never quote a conversion job without confirming whether Part E and sound testing apply. The test is the gate, and a failed wall is a re-build.

Common Pricing Mistakes

• Selling mass when the problem needs decoupling — low-frequency music and impact noise need isolation, not just heavier board
• Ignoring flanking paths — a perfectly treated wall fails if sound travels via floor and ceiling junctions
• No re-skim, re-skirt, socket move allowance — boarding out a wall triggers a chain of finishing trades
• Forgetting lost room depth — 50-125mm off a wall changes skirting, architrave, radiator pipes and door swing
• No sound test budget on conversions — Part E jobs need Pre-Completion Testing; a fail means re-work
• Promising "silence" — soundproofing reduces, it rarely eliminates; over-promising guarantees a dispute
• Sealing a room with no ventilation — an airtight room is unsafe; acoustic ventilation must be in the quote

Frequently Asked Questions

Will soundproofing make the room completely silent?

No. Soundproofing reduces sound transmission; it does not eliminate it. A good decoupled system can make a noticeable, sometimes dramatic, difference to airborne noise like voices and TV, but low-frequency bass and impact (footsteps) are much harder. Always describe the expected outcome as "significantly reduced" in writing and avoid the word "soundproof" in the literal sense to prevent disputes.

How much room depth will soundproofing take?

A resilient bar wall system loses about 50-75mm; an independent stud wall about 100-125mm. Ceilings drop 50-150mm depending on whether bars or a fully independent ceiling are used. Floating floors add 20-90mm of height. This affects skirting, architrave, radiator positions, door swings and ceiling height — all of which must be allowed for in the quote.

Do I legally have to soundproof when converting a house into flats?

Yes. A material change of use creating new dwellings triggers Building Regulations Approved Document E. The separating walls and floors must achieve the airborne and impact insulation targets, demonstrated either by Pre-Completion Testing or by adopting Robust Details. This is a legal requirement, not optional, and a failed test means the work must be improved and re-tested.

Why does the wall still let sound through after treatment?

Almost always flanking transmission. Sound travels around the treated element through the floor, ceiling, adjoining walls, or shared service voids. Treating one wall in isolation rarely solves a noise problem on its own. A proper assessment identifies all the paths; this is why genuine noise control is usually a room treatment, not a single surface.

What's the difference between soundproofing and acoustic absorption?

Soundproofing (mass + isolation) stops sound passing between rooms. Acoustic absorption (foam panels, soft furnishings) reduces echo and reverberation within a room — it does almost nothing to stop sound reaching the neighbour. Customers frequently confuse the two; foam panels on a party wall will not stop the neighbour's TV.

Regulations & Standards

• Building Regulations 2010 — Approved Document E (Resistance to the passage of sound) — airborne and impact insulation requirements for separating walls and floors in new and converted dwellings

• Robust Details Ltd — pre-approved separating constructions as an alternative to Pre-Completion Testing

• BS EN ISO 16283-1 / 717-1 — field measurement and rating of airborne sound insulation (DnT,w + Ctr)

• BS EN ISO 16283-2 / 717-2 — field measurement and rating of impact sound (L'nT,w)

• Work at Height Regulations 2005 — for ceiling and high-level work

• COSHH 2002 — mineral wool, adhesives and damping compounds require risk assessment

• VAT Notice 708 — reduced rate for qualifying conversions creating dwellings

• Approved Document E — Resistance to the passage of sound — statutory sound insulation requirements

• Robust Details Ltd — approved separating constructions

• BSI — British Standards Institution — BS EN ISO 717 / 16283

• HSE — Work at Height Regulations 2005 — high-level work safety

• HSE — COSHH — hazardous materials guidance

• VAT Notice 708: buildings and construction — reduced-rate eligibility

• part e sound — Approved Document E targets, testing and Robust Details explained

• acoustic plasterboard — dense board selection and fixing for sound control

• stud walls — building independent and resilient stud partitions

• quotes vs estimates — fixing the spec and expectation before you commit to a price