Flooring Types for London Home Extensions: A Specification Guide

Porcelain tile is the dominant floor finish in London kitchen extensions because it combines durability, water resistance, and design versatility. Modern porcelain tiles are manufactured at very high temperatures and pressures from refined clay, producing a dense, hard, and low-porosity tile that requires no sealing and is resistant to staining, scratching, and thermal shock. Key specification decisions for porcelain: Format: Large-format tiles (600x600mm, 600x1200mm, or 1200x1200mm) are widely used in contemporary London extensions because they create a clean, uninterrupted floor plane with fewer grout lines. They require a very flat, level substrate — any unevenness is amplified at large formats. Rectified tiles (precisely cut to exact dimensions) are required for large-format installation at fine grout joints. Finish: Matt and honed finishes are more practical for domestic floors than polished (which shows every footprint and scratch). Anti-slip matt finishes are appropriate near glass doors to the garden and in areas likely to receive water. Thickness: Domestic porcelain tiles are typically 9–12mm thick. 20mm porcelain slabs are available for outdoor terraces and can be used to create continuity between internal and external flooring at glass wall junctions. Stone-effect: Concrete-effect, slate-effect, and marble-effect porcelain tiles are the dominant current design trend in London extensions. The quality of the visual print (which determines how realistic the stone effect looks) varies significantly between manufacturers and price points. Budget tiles may have obvious print repetition; premium tiles use multiple print layers to create a near-natural appearance. Typical cost: £30–£100/m² for supply of standard to premium porcelain tile; £25–£50/m² for installation (excluding adhesive, grout, and preparation).

Engineered wood flooring: Engineered wood consists of a hardwood veneer (typically 3–6mm thick) bonded to a multi-layer plywood or high-density fibreboard (HDF) core. The plywood core is dimensionally stable — it does not expand and contract with humidity changes the way solid timber does — making it suitable for use over underfloor heating and in the open-plan environments common in London extensions. Engineered wood flooring is available in a wide range of species (oak is the most popular, followed by ash and walnut), widths (up to 250mm planks in premium ranges), and finishes (natural oiled, white oiled, lacquered, smoked, brushed). For a London extension, wider planks in a natural or white-oiled finish are the dominant current choice — they complement the natural light from rooflights and rear glazing. With UFH: always check the manufacturer's maximum floor surface temperature specification (typically 27°C) and commission the UFH system slowly on first use (allow the screed to dry out gradually over 2–3 weeks before reaching maximum temperature). Installation method: floating installation (clips or locked to itself, no adhesive or fixings to the floor) is suitable for extensions on concrete bases where the floor is flat and dry; glue-down installation provides better acoustic performance and is preferred for boards over 180mm wide. Luxury Vinyl Tile (LVT): LVT is a multi-layer vinyl product with a photographic print layer (replicating wood, stone, or tile) protected by a wear layer of 0.3mm–0.7mm. Products at 0.5mm+ wear layer thickness are appropriate for domestic heavy use. LVT is completely waterproof, dimensionally stable, soft underfoot (making it more forgiving than tile on hard kitchen floors), and fully compatible with underfloor heating. It is one of the most practical flooring choices for a London family kitchen extension. Premium LVT products (Karndean, Amtico, Polyflor Affinity) are significantly more expensive than budget vinyl but provide a substantially better visual result and a longer lifespan. Typical supply cost: LVT £25–£70/m² supply; engineered wood £30–£80/m² supply depending on species and specification.