Material costs: porcelain, stone, block and York stone
Concrete block paving (Marshalls, Brett, Tobermore) is the lowest-cost option at £60–£120/m² installed. It is durable, repairable and available in permeable variants (suitable for front gardens under SuDS rules). Natural sandstone from India and Pakistan (Raj Green, Fossil Mint, Golden Limestone) costs £90–£170/m² installed — it is warm in tone and suits Victorian and Edwardian garden styles, but requires sealing and periodic re-pointing with flexible pointing mortar. Porcelain paving (from suppliers including Bradstone, Marshalls, Stonemarket) costs £130–£250/m² installed. It is extremely durable, low-maintenance and frost-proof, and is available in 20mm-thick external grades suitable for foot traffic and light vehicular use. Its limitation in conservation areas is its visually contemporary character — planning officers in Camden, Islington or Westminster may resist large-format porcelain on historically significant properties. Reclaimed York stone flags — salvaged from Victorian street and warehouse floors — cost £180–£380/m² installed and are the most appropriate material for period London properties. Porosity varies by source; seal reclaimed York stone after laying to prevent staining.
Sub-base, falls and London Clay drainage
London Clay is a poor-draining soil — water sits on the surface and does not percolate readily. Regardless of paving material, adequate falls (minimum 1:80, ideally 1:60) must be designed into the layout to direct surface water to a gully, soakaway or planted border. A 100–150mm MOT Type 1 sub-base compacted to 95% Proctor density is the minimum for pedestrian paving on London Clay; vehicular-rated areas require 150–200mm. Bedding: for rigid paving (natural stone, porcelain) use a semi-dry cement mortar bed (4:1 sharp sand:cement); for flexible block paving use 50mm sharp sand bedding. Jointing: flexible pointing mortar (Rompox, Litoset, Pavemate) outperforms traditional cement pointing in London's freeze-thaw cycle — traditional pointing cracks at the stone-mortar interface during winter frost. For large porcelain slabs (800×800mm or larger), full-bed adhesive (Larsen, Instarmac) is mandatory to prevent hollow spots that cause slabs to rock and crack under foot traffic.
SuDS and front garden paving rules
Since 2008, paving over 5m² of front garden in England requires either permeable surfacing (permeable block paving, resin-bound gravel, grasscrete, open-jointed setts) or a drainage system directing runoff to a lawn, border or soakaway. This applies to new front garden paving — it is a permitted development condition, not a planning application trigger, but non-compliant paving can be enforced against. In practice, most front garden paving projects in inner London boroughs (Islington, Lambeth, Southwark) opt for resin-bound gravel (£80–£140/m²) or permeable block paving with a SuDS-compliant sub-base to satisfy the rule. In conservation areas, the materials palette for front garden paving is often restricted by Article 4 directions or conservation area design guidance — York stone, natural setts or permeable block in muted tones are typically specified over large-format porcelain.
