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Acoustic, thermal or vapour underlay — what to spec under laminate, engineered or carpet.
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Costs, timelines, pitfalls and the right questions to ask before any flooring starts on floor Underlay.
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Top tips
Hiring a flooring, without the regret.
Four moves that separate a smooth job from a nightmare.
Too thick for click floors
Laminate over 3mm foam pops click joints. Max 3mm for laminate; 1.5–2mm for LVT.
No DPM on concrete
Concrete always emits moisture. Without DPM, the floor cups within months.
Wrong Tog rating over UFH
High-Tog underlay insulates the heat from the room. Specify <1.0 Tog for UFH.
Overlapping joints
Cheap fitters overlap underlay creating bumps. Always butt-join with tape.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Basic 3mm foam laminate underlayFor laminate over timber
£2–£5
5mm foam + DPM combinedFor laminate over concrete
£3–£8
Premium acoustic laminate underlayTuplex, Quickstep Silentwalk
£6–£15
LVT-specific underlay1.5–2mm only
£4–£12
Carpet underlay PU foam (Cosi)9–11mm thick
£4–£12
Carpet underlay wool feltHeritage option
£6–£15
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Flooring briefing.
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Flooring explained
Floor underlay is the most underrated element of a successful floor install. The right underlay improves comfort, extends floor life, deadens noise and protects against moisture. Expect to pay £2–£15 per m² for UK floor underlay depending on type.
What Does the Work Invovle?
Underlay is rolled or laid out under the finish floor — laminate, LVT, engineered wood, or carpet. Joints are taped with manufacturer's tape (no overlap — they must butt). Concrete subfloors need an integral DPM (damp-proof membrane) underlay. Timber subfloors don't. Some underlays have built-in vapour barriers; others need a separate DPM laid first.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Basic 3mm foam laminate underlay | 2 | 5 | For laminate over timber |
| 5mm foam + DPM combined | 3 | 8 | For laminate over concrete |
| Premium acoustic laminate underlay | 6 | 15 | Tuplex, Quickstep Silentwalk |
| LVT-specific underlay | 4 | 12 | 1.5–2mm only |
| Carpet underlay PU foam (Cosi) | 4 | 12 | 9–11mm thick |
| Carpet underlay wool felt | 6 | 15 | Heritage option |
| UFH-compatible underlay | 5 | 15 | Low-Tog rating |
How Long Does It Take?
Laying underlay is fast — 20 m² in 30 minutes. The cost is usually labour-included in the floor install.
DIY or Professional?
Underlay is DIY-friendly. Just roll, butt-join, tape, and start the floor.
Choosing the Right Tradesperson
The flooring fitter normally supplies and installs underlay. Specify the underlay grade — don't accept "we'll use what we have". Quality underlay is £6–£15/m² and is worth specifying.
UK Regulations
Building Regs Part E (acoustic) in flats — underlay must achieve required dB rating. Building Regs Part L (thermal) — for UFH, low-Tog underlay required so heat passes through.
Common Problems
- Too thick for click floors: Laminate over 3mm foam pops click joints. Max 3mm for laminate; 1.5–2mm for LVT.
- No DPM on concrete: Concrete always emits moisture. Without DPM, the floor cups within months.
- Wrong Tog rating over UFH: High-Tog underlay insulates the heat from the room. Specify <1.0 Tog for UFH.
- Overlapping joints: Cheap fitters overlap underlay creating bumps. Always butt-join with tape.
Frequently Asked Questions
Do I need underlay?
Yes — never lay laminate, LVT click, engineered wood or carpet directly on the subfloor. Concrete absolutely needs DPM-integrated underlay.
What underlay for laminate over concrete?
5mm combined foam + DPM. Quick-Step Silentwalk, Tuplex, or similar branded products.
Best underlay for carpet?
PU foam (Cosi, Tredaire) 9–11mm thick. Wool felt is traditional but less common now. Match the Tog rating to your heating system.
Can I lay over old carpet underlay?
No — different thickness/density. Always remove and replace with the right underlay for the new floor.
What underlay with UFH?
Specific UFH underlay — low Tog (<1.0), often with reflective film backing. Cheap thick underlay insulates the heat away.
Does underlay reduce noise?
Yes — quality acoustic underlay reduces impact noise (footsteps) by 20–25 dB. Critical for flats.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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