Summary

Patio installation is the highest-volume domestic garden trade job in the UK. Volume retailers (B&Q, Wickes, Travis Perkins, Bradstone direct) sell millions of slabs to DIY and trade customers each year. The pricing variability mirrors driveways: a cowboy lays slabs on sand-over-soil for £30/m²; a proper installer specifies sub-base, mortar bed, and full pointing for £100-£200/m².

The legitimate specification: excavate to 200-250mm depth, lay geotextile membrane, install 100-150mm of Type 1 MOT sub-base compacted, lay slabs on a 35-50mm full mortar bed (NOT spot bedding), point joints with weatherproof mortar or jointing compound. The compromise spec — spot bedding on small mortar pads — is cheaper but causes rocking, settlement, and uneven appearance within 2-5 years.

This guide covers all common patio scenarios with material costs, sub-base options, and the SuDS considerations. For block paving driveways see block paving pricing guide; for decking see decking installation pricing guide; for resin-bound see resin driveway pricing guide.

Key Facts

Materials (per m² supplied)

Labour and ancillary costs

Regulatory

Quick Reference Table

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Patio Type Material Size Days Total Range (Regional) Total Range (London)
Budget concrete Concrete slab, mortar bed 15m² 2-3 £1,200-£2,200 £1,500-£2,600
Budget concrete As above 25m² 3-5 £2,000-£3,500 £2,400-£4,200
Mid-range concrete Riven texture, kerb edge 25m² 4-5 £2,400-£3,800 £2,800-£4,500
Indian sandstone Calibrated, brush-jointed 25m² 4-5 £2,500-£4,200 £3,000-£5,000
Indian sandstone As above 50m² 7-10 £4,800-£8,000 £5,800-£9,500
Porcelain paving 20mm, slurry primed 25m² 5-7 £3,200-£5,500 £3,800-£6,500
Porcelain large-format 800x1200, premium 25m² 6-8 £4,500-£7,200 £5,200-£8,500
Yorkstone (new sawn) Premium natural 25m² 7-9 £6,500-£10,500 £7,500-£12,500
Premium granite Flamed finish 25m² 6-8 £4,200-£7,000 £5,000-£8,500
Large premium patio 50m²+ porcelain or stone 50m² 10-14 £8,500-£14,500 £10,000-£17,500

Detailed Guidance

The proper sub-base build-up

A correctly-installed patio has the following structure (top to bottom):

  1. Slab — 20-40mm thickness (varies by material)
  2. Mortar bed — 35-50mm full bed (NOT spot dabs), 4:1 sharp sand to cement, semi-dry
  3. Type 1 MOT sub-base — 100-150mm compacted (lighter than driveway, no vehicle traffic expected)
  4. Geotextile membrane — separates sub-base from soil
  5. Excavated soil — minimum 200mm depth removed

The full mortar bed is the most-skipped spec. Spot bedding (small mortar dabs at corners and centre) is faster and cheaper but causes rocking, hollow-sounding tiles, and water ingress under slabs. Always full-bed for porcelain and premium stone; spot bedding is acceptable only for concrete slabs in light-use patios.

Porcelain paving REQUIRES a slurry primer (epoxy or polyurethane bonding agent) on the back of each slab — porcelain doesn't bond to mortar without primer. Skipping the primer is the most common reason for porcelain patio failures (lifting, popping, hollow patches).

Material choice — concrete vs natural vs porcelain

Concrete slabs are the volume choice (60%+ of UK domestic patios). Manufactured by Marshalls, Bradstone, Stonemarket, Tobermore — riven (textured to look like natural stone) or smooth. Cost-effective and colour-stable for 5-10 years; some fading after this.

Indian sandstone is the volume premium choice. Two grades: calibrated (uniform thickness 20-22mm, faster to lay) and hand-cut (variable thickness 20-30mm, more authentic look, more labour). Often sold as "Raj green", "Kandla grey", "Mint", "Modak" — colour variations from Indian quarries.

Porcelain paving is the fastest-growing segment — UV-stable, frost-resistant, stain-resistant. 20mm porcelain is the standard outdoor thickness; 10mm porcelain is interior only. Premium porcelain has anti-slip ratings (R10-R12) for safety compliance.

Premium natural stone — Yorkstone (reclaimed or new), granite, slate, basalt, travertine. Higher cost, distinctive character, longest service life (50+ years for properly-laid Yorkstone).

Slip resistance — the regulatory requirement

Slip resistance is governed by:

For domestic patios, R10-R11 is the recommended minimum. Premium porcelain typically rated R11; concrete slabs with riven texture typically R10-R11; smooth honed natural stone may be R9 or R10 and slippy when wet.

Slip-resistant treatment of existing patios is possible (anti-slip coatings, treated grit blasting) at £15-£35/m². Worth considering for honed stone patios that have become slippery with age.

Excavation and drainage

Patios need a fall (typically 1:60 to 1:80) away from the property to drain rainwater. The fall direction:

Channel drains (ACO) at the house wall intercept water if the fall goes that way. £45-£85/m + labour.

For patios over 30m² or where SuDS is a concern, ensure the patio drains to a permeable area (lawn, garden border) rather than directly to mains drainage. Building Regulations Part H applies.

Specialist materials — Yorkstone, basalt, large-format

Yorkstone (sawn natural stone from Yorkshire quarries) is the premium UK domestic option. Reclaimed Yorkstone (from re-purposed old buildings) is more variable but cheaper than new sawn; both deliver a 50+ year service life with distinctive character. Always inspect Yorkstone samples for cleavage planes — poor quality stone may delaminate over years.

Basalt and granite are dark, dense, modern-looking options. Flamed (rough textured) or honed (smooth) finishes. Frost-resistant, stain-resistant. Premium spec.

Large-format porcelain (800x1200mm or larger) is the contemporary design choice. The fewer joints look cleaner but the slabs are heavy (45-65kg each) and require 2-person lifting plus careful bedding. Labour premium 25-40% over standard 600x600mm sizes.

Hidden costs and risk premium

The five most-missed cost lines in patio installation quotes are: (1) garden wall building / damage repair adjacent to the patio; (2) drain access / inspection cover incorporation; (3) tree root removal / management; (4) skip access through narrow side-passage (adds porter labour); (5) lighting installation (under-step LED, deck lighting) if customer adds late.

Risk premium of 10-15% is standard on patios in older properties. Premium of 15-25% if access is difficult (terraced houses with no rear access).

Frequently Asked Questions

Do I need planning permission for a patio?

For most domestic patios — no. Patios under 30m² and less than 300mm above ground level fall within Permitted Development (Town and Country Planning General Permitted Development Order). Larger patios, raised patios, or patios in conservation areas / listed buildings may need permission. Check with the local authority before scoping the work.

What's the difference between calibrated and hand-cut Indian sandstone?

Calibrated sandstone is machine-cut to a uniform thickness (typically 20mm or 22mm). Hand-cut sandstone is split from the quarry with variable thickness (typically 20-30mm). Calibrated is faster to lay because the mortar bed is consistent thickness; hand-cut has more authentic character but requires more labour to adjust each slab's bedding. Cost: calibrated is typically 20-30% more expensive per m².

Why does porcelain paving need a primer?

Porcelain is a vitrified ceramic with very low porosity (<0.5% water absorption). Mortar bonds to its substrate by mechanical interlock with surface pores — porcelain has no pores for mortar to grip. A slurry primer (epoxy or polyurethane bonding agent) is brushed onto the back of each porcelain slab before bedding; the primer bonds chemically to both the porcelain and the wet mortar. Skipping the primer causes lift-off failures within 1-3 winters.

How do I price a patio if the customer wants me to use their slabs?

Quote labour only with a clear customer-supplies-materials caveat. Standard labour for installing customer-supplied slabs is £40-£70/m² regional, £55-£90/m² London — covers excavation, sub-base, mortar, jointing, and disposal of arisings, but excludes the slab material cost. Add a damage clause: "any breakage during install will be re-charged at customer cost".

Can I install a patio on a sloping garden?

Yes, but with engineering. Slopes over 1:20 (5%) typically require step or terrace construction — retaining walls and graded patios at different levels. This is a significantly more complex job than a flat patio: retaining wall £180-£350/m, steps £180-£280 per step, drainage channels. Always survey gradient before quoting; sloping gardens routinely surprise customers and trade.

Regulations & Standards