Floor Finishes for London Homes: Choosing the Right Flooring for Each Room

**Solid timber:** Solid timber floorboards (typically 18–22mm thick) are the traditional and characterful choice for period London homes. Original Victorian floorboards are often found beneath carpets and, once sanded and finished, can be the most cost-effective and authentic floor finish available. However, solid timber has significant limitations:

• •It is not suitable for installation over underfloor heating — solid timber moves with changes in humidity and temperature to an extent that UFH cycles cause excessive movement and potential splitting or gapping
• •It requires a stable subfloor — uneven suspended timber floors need levelling before laying a new solid timber floor on top
• •It requires sanding and finishing (oil, hardwax oil, or lacquer) and ongoing maintenance

**Engineered wood:** Engineered wood flooring — a real hardwood veneer (typically 4–6mm) bonded to a multi-ply timber core — is the most popular premium floor finish in London extensions and renovations. Engineered wood:

• •Is suitable for installation over underfloor heating (within the manufacturer's specified temperature parameters — typically maximum 27°C surface temperature and maximum 4°C temperature differential in a 24-hour period)
• •Is more dimensionally stable than solid timber — the multi-ply core resists movement
• •Can be sanded and refinished 1–3 times depending on veneer thickness
• •Is available in oak, walnut, ash, and other species, and in a wide range of widths (90mm to 300mm) and finishes (lacquered, oiled, brushed, smoked)
• •Can be floated (click-lock system on acoustic underlay) or glued directly to a prepared subfloor — gluing is generally preferred over underfloor heating

• **Substrate requirements for engineered wood:**
• •The subfloor must be flat to within 3mm over 1800mm (or tighter — check the manufacturer's specification)
• •Over a concrete slab or screed, the substrate must be dry (typically below 75% relative humidity or 2.0% moisture content by weight — check manufacturer spec for the specific product)
• •Over a suspended timber floor, the floor should be solid (no movement), level, and dry

**Cost:** Engineered wood flooring supply only: £30–£90/m² for mid-range products; £60–£150/m² and above for wide-plank premium products. Fitting: £15–£30/m² (glued to screed); £12–£20/m² (floated). Subfloor preparation additional if required.

**Luxury Vinyl Tile (LVT):** LVT — often referred to by brand names such as Amtico, Karndean, or LVT from manufacturers such as Moduleo or Polyflor — has become the most practical flooring choice for many London renovations, particularly rental properties and family homes. LVT characteristics:

• •Fully waterproof — suitable for bathrooms, wet rooms, kitchens, and utility rooms as well as living spaces
• •Suitable for installation over underfloor heating (most LVT products specify a maximum surface temperature of 27–28°C)
• •Extremely durable and scratch-resistant, particularly commercial-grade products (wear layer 0.55mm+)
• •Easy to clean and maintain
• •Available in tile and plank formats mimicking stone, wood, and concrete finishes
• •Can be installed over most existing substrates with minimal preparation, provided the subfloor is flat
• •Available in two installation systems: fully adhered (glued down) for over-UFH or commercial use; loose-lay or click-lock for domestic floating installation

The main limitation of LVT is its visual character — even high-quality LVT is distinguishable from natural stone or engineered wood to a trained eye — and its environmental footprint (PVC product).

**Cost:** LVT supply only: £20–£60/m² for mid-range products (Karndean, Amtico Spacia); £50–£80/m² and above for premium ranges (Amtico Signature, Bespoke). Fitting: £10–£20/m² (floating); £15–£25/m² (fully adhered). Flat, prepared subfloor assumed.

**Porcelain and ceramic tile:** Porcelain tiles are the standard choice for kitchens, bathrooms, and utility rooms in London renovations. Large-format porcelain (600×600mm and above, up to 1200×2400mm slabs) has become increasingly popular for open-plan kitchen-dining floors and bathroom walls. Key considerations:

• •Porcelain is fully waterproof and highly durable — appropriate for all wet areas
• •Large-format tiles require a very flat, rigid substrate — any flex in a suspended timber floor will cause grout cracking and tile failures; a decoupling membrane (such as Ditra) is strongly recommended over timber subfloors
• •Porcelain over underfloor heating: electric mat UFH can be embedded in the tile adhesive bed; water UFH requires a sufficient screed depth (at least 65mm from the top of the pipe to the finished floor surface is typical for screed-embedded systems)
• •Thin porcelain (6mm) and ultra-large format (1200×2400mm+) slabs require specialist cutting equipment and installation expertise
• •Grout joint width affects the overall aesthetic — rectified tiles (precision-cut to consistent dimensions) allow minimum 1.5–2mm joints; non-rectified tiles typically require 5mm+ joints

**Cost:** Porcelain tiles supply only: £25–£60/m² mid-range; £50–£150/m² and above for large-format or premium Italian/Spanish tiles. Fitting: £35–£65/m² (standard format); £50–£90/m² (large format 900×900mm and above). Adhesive, grout, and subfloor preparation additional.

**Natural stone:** Natural stone — limestone, travertine, slate, marble, sandstone — provides an authentic, premium, and unique floor finish. Each slab is different. Stone is particularly appropriate in period London homes with restored original features, in high-end new extensions, and in bathrooms and kitchens where longevity and character matter.

Key stone flooring considerations:

• •**Weight**: Natural stone 20mm thick is heavy — typically 45–55 kg/m² depending on the stone type. For upper floors, the structural engineer must confirm the floor can carry the additional dead load. This is often a constraint in loft bathrooms.
• •**Porosity**: Limestone, travertine, and sandstone are porous and must be sealed before use and periodically re-sealed. Slate is generally less porous. Marble is hard but can stain if unsealed.
• •**Compatibility with UFH**: Stone is an excellent conductor of heat and works very well with underfloor heating. Ensure the stone is laid in a flexible adhesive (not standard OPC mix) over UFH to allow for differential movement.
• •**Subfloor requirements**: A stiff, flat, level substrate is essential — more critical than for lighter finishes. Any movement will crack grout joints or, eventually, the stone itself.
• •**Sourcing**: Batch consistency matters — stone from the same quarry batch ensures colour and vein consistency. Buy enough from one batch for the whole area (include 10–15% waste allowance for cuts).

**Cost:** Limestone/travertine supply: £40–£100/m² (standard formats); £80–£200/m² and above (book-matched or large slab). Marble: £80–£300/m² and above. Fitting: £50–£80/m² for standard formats; £80–£120/m²+ for large-format stone or complex pattern laying (herringbone, versailles).

**Polished concrete and micro-cement:** Polished concrete (grinding and sealing an existing or new concrete slab) and micro-cement (a thin, cement-based coating applied over existing floors and walls) have become popular in contemporary London extensions and refurbishments.

• •Polished concrete requires a new structural concrete slab or a thick poured overlay (typically 50mm+) to be ground back — cost is high (£80–£150/m² all-in) and the process is disruptive
• •Micro-cement (Betonetage, Pandomo, or similar branded systems) can be applied in 2–3mm thickness over existing tiles, concrete, and prepared timber floors — providing a seamless, contemporary finish without demolishing the existing floor. Cost: £80–£150/m² supply and apply for premium specialist-applied systems.
• •Both require significant skill to apply well — a specialist contractor is essential; these are not standard builder finishes
• •Both work very well with underfloor heating

• **Choosing by room:**
• •Living rooms, bedrooms: engineered wood (premium character), LVT (practical family home), carpet not installed by rcbGroup
• •Open-plan kitchen-diner extension: large-format porcelain, LVT, or engineered wood
• •Kitchen and utility: porcelain, LVT
• •Bathroom and ensuite: porcelain, natural stone, micro-cement wet room
• •Hallway: porcelain, natural stone, engineered wood
• •Loft rooms: engineered wood or LVT (weight consideration)