How to Price Acoustic Underlay: Labour, Materials and Margin Guide
Quick Answer: Comfort acoustic underlay for laminate or LVT typically costs £4–£12/m² supplied, while Part E-compliant systems with test data (resilient battens, cradle-and-batten, acoustic boards over joists or concrete) run £18–£60/m² installed before labour. The critical distinction: a £6/m² foam underlay sold as "acoustic" reduces footstep noise for the occupant's comfort but will not pass a Building Regs Part E pre-completion sound test on a flat conversion. If you are quoting a flat, conversion or new-build separating floor, price a tested system — not a comfort underlay — or you risk a failed test and an expensive re-do.
Summary
"Acoustic underlay" covers two very different jobs that share a name, and confusing them is the single most expensive mistake a tradesperson can make on a flat. The first job is comfort: a thin foam, rubber or felt layer under laminate, LVT or carpet that softens footstep noise and improves the feel of the floor for the people living in that room. The second job is regulatory: reducing impact and airborne sound passing through a separating floor between two dwellings, to a standard set by Building Regulations Part E. These are not interchangeable products. A comfort underlay reduces noise within a dwelling; a Part E system reduces noise between dwellings and must hit measured performance targets.
For a normal floor in a house — a homeowner laying laminate over a timber or concrete subfloor — comfort underlay at £4–£12/m² is correct and there is no test to pass. For a separating floor in a flat, a conversion of a house into flats, or a new-build apartment, the floor build-up must achieve the Part E impact and airborne sound limits, and this almost always means a resilient batten system, a cradle-and-batten platform, dense acoustic mats with a floating screed or board layer, or a proprietary tested assembly. These systems cost several times more, add significant height, and on conversions and new builds usually require either pre-completion sound testing or registration under Robust Details.
When quoting, your job is to identify which scenario applies before you price anything. Get the build-up height right (it affects doors, skirtings and thresholds), account for flanking transmission, and quote the tested system as a complete assembly rather than just "underlay". This guide gives realistic 2026 UK prices, the labour and margin picture, and the regulatory framework so you can quote with confidence and avoid the failed-test trap.
Key Facts
- Comfort foam/rubber underlay (laminate/LVT) — £4–£12/m² supplied; reduces in-room footstep noise but carries no Part E test credit
- Carpet acoustic underlay (PU foam/crumb) — £4–£9/m² supplied; comfort-grade, not a separating-floor solution
- Dense rubber-crumb acoustic mat — £12–£28/m² supplied; used as a resilient layer within a tested build-up, not as a finished-floor underlay alone
- Resilient acoustic battens (over joists) — £18–£35/m² supplied for the batten system; part of a tested floating-floor assembly
- Cradle-and-batten system — £25–£45/m² supplied; self-levelling platform for uneven concrete or timber, with acoustic cradles
- Acoustic overlay boards (over concrete/timber) — £15–£40/m² supplied depending on board mass and resilient backing
- Part E impact sound limit (new-build flats) — L'nT,w must be no more than 62 dB
- Part E airborne sound limit (new-build separating floors) — DnT,w + Ctr must be at least 45 dB
- Conversions (existing buildings into flats) — performance targets are slightly relaxed versus new build
- Pre-completion testing — required for new-build and conversion separating floors unless the floor uses a registered Robust Detail (new build only)
- Robust Details — an alternative to pre-completion testing, available for new-build separating floors only, not conversions
- Build-up height — tested floating systems commonly add 40–100 mm+ to the floor, affecting door bottoms, thresholds and skirting
- Flanking transmission — sound bypasses the floor via walls, junctions and rigid penetrations; underlay alone never controls flanking
- Labour for comfort underlay — usually folded into the floor-laying rate; £6–£12/m² as a standalone line
- Labour for tested systems — £15–£40/m² depending on battens vs cradles vs floated screed; specialist work
- VAT — 20% standard; reduced/zero rating may apply on some new-build and conversion works (see Regulations)
- Margin — materials marked up 15–30%; tested-system labour carries the real value and risk premium
Quick Reference Table
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Try squote free →| Product / System | Typical Cost £/m² | Notes |
|---|---|---|
| Foam acoustic underlay (laminate) | £4–£8 | Comfort only; no Part E credit |
| Premium fibreboard/rubber underlay (LVT) | £8–£12 | Comfort only; good in-room feel |
| Carpet PU/crumb acoustic underlay | £4–£9 | Comfort only; not a separating solution |
| Dense rubber-crumb acoustic mat | £12–£28 | Resilient layer inside a tested build-up |
| Resilient acoustic battens (over joists) | £18–£35 | Floating timber floor; part of tested assembly |
| Cradle-and-batten system | £25–£45 | Levels uneven subfloor; acoustic cradles |
| Acoustic overlay board (concrete) | £15–£30 | Mass + resilient backing over slab |
| Acoustic overlay board (timber) | £20–£40 | Higher-mass boards for joisted floors |
| Floating screed acoustic system | £30–£60 | Resilient layer + screed; high mass, high height |
| Proprietary tested separating-floor kit | £35–£70 | Full assembly with manufacturer test data |
| Comfort underlay labour (standalone) | £6–£12 | Usually within floor-laying rate |
| Tested-system installation labour | £15–£40 | Specialist; flanking detailing included |
Detailed Guidance
Comfort Underlay vs Part E Systems
This is the distinction that decides the whole quote. Comfort underlay is a thin resilient layer laid under a finished floor to make footsteps quieter and the floor warmer and softer for the people in that room. It is measured by the manufacturer in decibels of impact sound reduction (often quoted as "up to 21 dB" or similar), but that figure is a laboratory in-room reduction, not a separating-floor performance under Part E. A homeowner laying laminate in a bedroom needs comfort underlay and nothing more — there is no regulatory test.
A Part E system is an engineered floor build-up whose whole job is to stop sound passing between two separate dwellings. It is judged by an on-site measurement of the completed floor (impact sound L'nT,w and airborne DnT,w + Ctr). Achieving those numbers requires mass, isolation and careful junction detailing — not a 6 mm foam mat. When the quote is for a flat, a house being converted into flats, or any separating floor between dwellings, you are in Part E territory and a comfort underlay is the wrong product.
The trap: products marketed as "acoustic underlay" with impressive dB figures look like they should satisfy Part E. They do not. The manufacturer's lab figure is not site performance, and underlay alone does nothing for airborne sound or flanking. Always read whether the product comes with a tested system specification and an installation detail — if it is sold as a loose underlay roll, treat it as comfort-grade.
Product Types and Cost
Comfort underlays (£4–£12/m²) are foam, rubber, felt or fibreboard rolls and tiles laid under laminate, LVT or carpet. They are cheap, fast to fit, and add only 2–5 mm. Quote them as part of the floor-laying job.
Dense rubber-crumb acoustic mats (£12–£28/m²) are heavier resilient layers used inside a build-up, typically under a floating board or screed. On their own they are not a finished floor; they are one component of a tested assembly.
Resilient acoustic battens (£18–£35/m²) are timber battens with a bonded resilient strip. Laid over joists or a slab, they create a floating timber floor that isolates the walking surface from the structure. Common on timber separating floors in conversions.
Cradle-and-batten systems (£25–£45/m²) use adjustable acoustic cradles to carry battens, levelling an uneven or out-of-true subfloor while providing isolation. Useful in older conversions where the existing floor is far from flat.
Acoustic overlay boards (£15–£40/m²) are high-mass boards, often with a bonded resilient backing, laid over concrete or timber. They add mass and isolation with less height than a battened system.
Floating screed systems (£30–£60/m²) place a resilient layer over the structural floor, then a floating screed. High performance, high mass, but the most height and the longest programme (screed drying time).
Building Regs Part E and Testing
Building Regulations Part E (Resistance to the passage of sound), set out in Approved Document E, applies to separating floors between dwellings — including flats, rooms for residential purposes, and houses converted into flats. It sets minimum measured performance for both impact sound (footsteps, L'nT,w) and airborne sound (voices, music, DnT,w + Ctr). For new-build separating floors the typical limits are impact L'nT,w no more than 62 dB and airborne DnT,w + Ctr at least 45 dB; for conversions the targets are slightly relaxed.
There are two routes to demonstrate compliance on a new build. The first is pre-completion testing (PCT): an accredited tester measures a sample of the completed floors on site. The second is Robust Details: the developer registers the plot with Robust Details Ltd and builds to a pre-approved, pre-tested construction detail, which exempts that floor from PCT. Robust Details are available for new build only — conversions cannot use them and must rely on pre-completion testing.
Practically, if you are quoting a conversion, assume pre-completion testing is required and that the floor must be designed as a tested system. Build the cost of the acoustic build-up, the flanking detailing, and the testing itself into the quote (testing is usually arranged by the client or main contractor, but flag it). Never quote a comfort underlay and imply it will pass.
Floor Build-Up and Height
Tested systems add height, and height has knock-on costs that catch tradespeople out. A floating batten or cradle system can add 40–100 mm or more once the resilient layer, battens, deck board and finish are stacked up. That changes everything that meets the floor: internal doors may need trimming or rehanging, thresholds and floor junctions need new transitions, skirtings may need raising, and on a refurbishment the new floor may sit proud of the level in adjoining rooms.
Always survey the existing floor level and the door bottoms before quoting. Add line items for door easing/rehanging, threshold strips, and any skirting adjustment — these are real costs and clients hate finding them as variations later. Where ceiling height is tight, a high-mass overlay board may be a better choice than a deep battened system; flag the trade-off between height and performance in your quote notes.
Labour and Margin
Comfort underlay labour is usually folded into the floor-laying rate; as a standalone line, allow £6–£12/m². There is little risk, so margin sits in the material markup (15–30%).
Tested-system labour is where the value and the risk live. Allow £15–£40/m² depending on whether it is battens, cradles, overlay boards or a floated screed, and remember the slow elements: screed drying, careful perimeter isolation, and flanking detailing at every wall, pipe and junction. This is specialist work — price it as such. Build in a risk premium for the consequences of a failed test: if you guarantee a result, you are taking on the cost of a remedial floor, so either price that risk in or make clear in writing that compliance depends on the wider construction (flanking walls, junctions) and is verified by the sound test, not by your underlay alone.
Material markup of 15–30% is normal; on a tested assembly the labour and the accountability are the margin, not the rubber.
Common Mistakes
- Specifying comfort underlay where Part E performance is required. The single most expensive error — a failed test means lifting and re-doing the floor.
- Trusting the lab dB figure as site performance. Manufacturer "up to X dB" is in-room laboratory data, not a separating-floor result.
- Ignoring flanking transmission. Sound bypasses the floor through walls, junctions and rigid penetrations. The best floor underlay cannot fix a flanking path.
- Forgetting build-up height. Doors, thresholds and skirtings cost money to adjust — quote them.
- Assuming Robust Details on a conversion. Robust Details are new-build only; conversions need pre-completion testing.
- Bridging the resilient layer. A single screw, batten or skirting touching both layers short-circuits the isolation and fails the test.
- Omitting the perimeter isolation strip. The floating floor must not touch the surrounding walls.
Frequently Asked Questions
How much is acoustic underlay per m²?
Comfort acoustic underlay for laminate, LVT or carpet is typically £4–£12/m² supplied. A Part E-compliant separating-floor system (battens, cradles, overlay boards or floated screed) is £18–£60/m² for materials before labour, and labour adds £15–£40/m². Identify which job you are quoting before pricing.
Do I need Part E-compliant underlay?
If the floor separates two dwellings — a flat, a room for residential purposes, or a house being converted into flats — yes, the floor must meet Building Regs Part E and you need a tested system, not a comfort underlay. For a floor within a single house (e.g. laminate in a bedroom), Part E does not apply and comfort underlay is fine.
Will underlay alone pass a sound test?
Almost never. A separating floor needs mass, isolation and flanking detailing to meet both the impact and airborne targets. A loose underlay roll addresses only in-room impact comfort and does nothing for airborne sound or flanking. Quote a complete tested assembly, not just underlay.
How much height does it add?
Comfort underlay adds 2–5 mm. Tested floating systems commonly add 40–100 mm or more. Always survey door bottoms, thresholds and skirtings, and include the cost of adjusting them in the quote.
Who arranges the sound test?
On conversions and new builds without Robust Details, pre-completion testing is usually arranged by the client or main contractor with an accredited tester. Flag it in your quote and make clear that compliance is verified by the test and depends on the whole construction, not your floor layer alone.
Regulations & Standards
Building Regulations Part E (Resistance to the passage of sound) — the statutory requirement for separating floors and walls between dwellings in England and Wales.
Approved Document E — practical guidance to meet Part E, including performance standards for separating floors. Typical new-build limits: impact L'nT,w ≤ 62 dB; airborne DnT,w + Ctr ≥ 45 dB; conversions slightly relaxed.
Pre-completion testing (PCT) — on-site measurement of completed separating floors by an accredited tester; required for new build and conversions unless exempted by Robust Details.
Robust Details — registered pre-approved constructions that exempt new-build (only) separating floors from PCT; administered by Robust Details Ltd.
BS EN ISO 717-2 — rating of impact sound insulation (L'nT,w weighting).
BS EN ISO 717-1 — rating of airborne sound insulation (DnT,w, Ctr).
BS EN ISO 16283 series — field measurement of sound insulation in buildings.
Note: Scotland (Building Standards, Section 5) and Northern Ireland (Technical Booklet G) have separate regimes — this guide covers England and Wales.
Approved Document E: Resistance to the passage of sound (gov.uk) — statutory guidance and performance standards
Robust Details Ltd — registered separating-floor details and the PCT exemption route
Building Regulations approval (gov.uk) — overview of compliance routes
BS EN ISO 717 / 16283 (BSI) — sound rating and field measurement standards