Most Peterborough homeowners focus on choosing the right carpet — and give almost no thought to the underlay underneath it. This is a mistake. Underlay affects how your carpet looks, how long it lasts, how warm the room feels, and how well sound is absorbed between floors. The wrong underlay can cut years off a quality carpet’s lifespan; the right underlay makes even a mid-range carpet feel considerably more luxurious.
Our carpet underlay supply and fitting service covers the whole of Peterborough — PE1, PE2, PE3, PE4, PE6, PE7 — and this guide explains everything you need to know before choosing.
Quick Answer: For most Peterborough homes, an 11mm PU foam underlay rated 130kg/m³ or above is the best choice for living rooms and bedrooms. For stairs, use a thinner rubber or felt underlay (7–8mm) to maintain carpet edge definition. For concrete subfloors — common in Peterborough bungalows and new builds — always use a damp-proof membrane underlay to prevent moisture transfer.
Carpet underlay serves four distinct functions. First, it acts as a cushion — absorbing the impact of foot traffic and preventing the carpet pile from being driven hard into the subfloor on every step. Without underlay, carpet pile compresses and flattens much more quickly, particularly in walkways and in front of sofas and chairs where people pivot their feet repeatedly.
Second, underlay provides thermal insulation. Particularly important in Peterborough’s older housing stock — the Victorian and Edwardian terraces of PE1 and PE2, the post-war bungalows of PE3, and the 1960s estates of Bretton and Orton — a good underlay adds meaningful warmth to rooms with concrete or suspended timber subfloors.
Third, underlay provides acoustic insulation — reducing impact sound transmission between floors. This matters most in upstairs bedrooms and in multi-storey Peterborough homes where footfall noise from upper floors carries to the rooms below.
Fourth, a quality underlay extends carpet life. The additional cushioning reduces pile fatigue, and on timber subfloors, the underlay bridges minor gaps and undulations in the boards that would otherwise create uneven wear patterns across the carpet surface.
PU (polyurethane) foam is the most commonly fitted underlay across Peterborough homes. It’s available in a wide range of thicknesses (7mm–12mm) and densities (100–160kg/m³), and offers the best cushioning performance per pound of any underlay type. The key performance metric is density, not thickness — a denser foam at 11mm will outperform a softer foam at 12mm and will resist compression far longer under furniture. We recommend PU foam with a density of 130kg/m³ or above for living rooms and bedrooms in Peterborough homes.
Rubber (crumb rubber) underlay is denser and firmer than PU foam. It’s the preferred choice for stairs across Peterborough, where the added firmness helps the carpet maintain a crisp edge on each step nose. Rubber underlay also has excellent durability — it doesn’t compress or degrade over time the way softer foam does — and is a good choice for hallways where a more solid feel underfoot is preferred. It costs slightly more than PU foam.
Wool or synthetic felt underlay offers very high thermal insulation and is the traditional choice for period properties in PE1 and PE2 where natural materials are preferred. It has a firmer, more traditional feel than PU foam and is well-suited to wool carpets from brands like Ulster or Brintons where a natural fibre pairing is desirable. Felt underlay is less commonly fitted today than foam or rubber but remains an excellent product when specified correctly.
Concrete subfloors are the norm in post-war bungalows and 1950s–1970s housing across Peterborough — particularly in Dogsthorpe (PE1), Paston (PE4), and the bungalow belt of Orton Waterville (PE2). Concrete subfloors can transmit ground moisture, which is absorbed by carpet backing and underlay over time, causing musty smells, mould growth, and premature carpet deterioration.
For any concrete subfloor, we always recommend a damp-proof membrane underlay — a foam or rubber underlay with an integrated foil or polythene vapour barrier. This is the single most important underlay specification decision for Peterborough homes with solid ground floors. Without it, a quality carpet installed on a concrete floor can develop moisture-related issues within a few years, regardless of how good the carpet itself is.
We specify and fit underlay from leading manufacturers including:
All of our underlay is included in the supply-and-fit quote provided on your free home visit. We don’t charge separately for underlay selection advice — it’s part of the service.
As a guide, carpet underlay costs £3–7/m² depending on type and specification — included within our all-in supply-and-fit quotes. For a typical Peterborough living room of 18m², the underlay component of the quote typically runs £60–£120. Premium underlays for concrete floors with damp-proof membrane are towards the top of this range. For a full carpet fitting quote including underlay for your Peterborough home, call us on 01733 924009.
Last Updated: 7 June 2026 | Author: Daragh Giannasi, Cambridgeshire Carpets Ltd | 191 Lincoln Road, Peterborough, PE1 2PN | 01733 924009
For most Peterborough living rooms, an 11mm PU foam underlay with a density of 130–150kg/m³ is the best choice. It provides excellent cushioning, extends carpet life, and adds warmth. For concrete subfloors — common in post-war and bungalow properties across Peterborough — always use an underlay with an integrated damp-proof membrane to prevent moisture transfer into the carpet backing.
Yes — stairs need a thinner, firmer underlay than flat rooms. We recommend a 7–8mm rubber or high-density foam underlay for Peterborough staircases. Thicker underlay on stairs causes the carpet to bunch at step edges, which looks poor and can become a trip hazard over time. Rubber underlay also helps the carpet maintain a crisp, defined edge on each step nose for longer.
Not ideally. Timber subfloors (common in older Peterborough terraces and upstairs in most properties) benefit from a slightly thicker, more cushioning underlay to bridge minor board gaps. Concrete subfloors require a damp-proof membrane underlay to prevent moisture transfer. We assess your specific subfloor type during the free home visit and recommend the correct underlay specification for each room.
Carpet underlay typically costs £3–7/m² as part of a supply-and-fit quote in Peterborough, depending on type and specification. For a typical living room of 18m², the underlay element runs £60–£120. All underlay is included in our all-in supply-and-fit quotes — there’s no separate charge. Call 01733 924009 for a free home visit and written quote.
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