Summary
Pergolas sit in an odd pricing gap: too small a job to run full construction overheads, but with enough structural and planning nuance (see pergola planning) that flat "per square metre" pricing from decking or fencing doesn't transfer cleanly. The frame itself is rarely the expensive part — footings, post-setting method, and roof covering are where the labour hours and material cost actually go.
The three variables that separate a £2,000 quote from an £8,000 quote are: foundation type (spike anchor vs concrete pad vs ground screw), material (pressure-treated softwood vs oak vs aluminium), and roof covering (fully open vs fixed louvre/polycarbonate vs motorised bioclimatic louvre — the last of which turns the job from a carpentry/landscaping job into one requiring an electrician for Part P notification). Missing any of these in the initial site visit is the single biggest cause of underpricing on pergola jobs.
Clients frequently don't know the difference between a pergola (posts and beams, traditionally open or lightly covered) and a gazebo (fully enclosed, walled) or a bioclimatic pergola (motorised aluminium louvres that close in rain) until they've seen prices for each. Establishing exactly what they want — and whether their expectation matches their budget — in the first conversation avoids a wasted site visit and a quote that gets binned on sight.
Key Facts
- Foundation choice drives labour time — concrete pad footings need excavation, hardcore, concrete cure time (minimum 7 days before loading); ground screws and metal spike anchors install in under an hour per post but aren't suitable on all ground types (see pergola planning for suitability by soil).
- Standard pad footing — 300–450mm square, 300–600mm deep; £35–£70 in materials per post plus 30–60 minutes labour.
- Ground screw — £25–£60 per screw (product) plus 20–30 minutes install per post with an SDS drill attachment; no concrete cure delay, so the whole job can be completed in one visit.
- Timber tiers — pressure-treated softwood (cheapest, 15–25 year life), green oak (mid-high, 50+ year life, will silver and check as it seasons), hardwood (ipe/iroko, 25–50 years, needs annual oiling), aluminium (highest capital cost, near-zero maintenance).
- Roof covering changes the trade mix — an open pergola (posts and rafters only) is a one-trade carpentry/landscaping job; a louvred or polycarbonate roof adds waterproofing detail and sometimes guttering; a motorised bioclimatic louvre roof requires an electrician for the drive motor and rain sensor (Part P notifiable circuit).
- Team size and day rate — most pergola installs are a two-person team; day rate £280–£450 depending on region and whether groundworks (footings) or just carpentry assembly.
- Kit vs bespoke build — proprietary kit pergolas (bolt-together aluminium or engineered timber systems) reduce labour time by 30–50% vs a bespoke oak-frame build but cost more in materials — net effect on price is often a wash, but cash flow and programme differ.
- Planning check is a billable pre-visit item — checking Conservation Area/Article 4/Listed status and PD height limits (see pergola planning) takes 20–30 minutes; charge £40–£75 as a site-visit/design fee, creditable against the job if it proceeds.
- Climbing plant loading — if the client wants wisteria, roses or similar heavy climbers trained over the structure, size beams and footings up a tier — this is a design decision to flag at quoting stage, not an afterthought.
- Access affects price — rear-garden-only access (no side gate, materials carried through the house) adds 10–20% to labour time; factor this at the site visit, not after materials are already on a pallet at the front of the house.
- VAT — standard-rated at 20% for domestic garden landscaping; no reduced rate applies unless part of a wider accessible-garden adaptation for a disabled occupant (zero-rated under different rules — check eligibility, don't assume).
Quick Reference Table
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Try squote free →| Pergola Type | Size | Foundation | Typical Installed Price |
|---|---|---|---|
| Basic softwood, open roof | 3×3m | Metal spike anchors, existing paving | £1,800–£2,800 |
| Softwood, open roof | 4×4m | Concrete pad footings | £3,200–£4,800 |
| Softwood with polycarbonate roof | 3×4m | Concrete pad footings | £3,200–£5,500 |
| Green oak frame, open | 3×3m | Concrete pad or ground screw | £4,500–£7,000 |
| Hardwood (ipe/iroko), open | 3×4m | Concrete pad footings | £5,500–£8,500 |
| Aluminium kit, fixed louvre roof | 3×4m | Ground screw or bolt-down base plate | £6,000–£10,000 |
| Aluminium bioclimatic (motorised louvre) | 3×4m | Concrete pad, electrical supply | £8,000–£14,000 |
| Aluminium bioclimatic (motorised louvre) | 4×5m+ with lighting/heating integration | Concrete pad, electrical supply | £14,000–£22,000+ |
Detailed Guidance
Building the quote: labour + materials + margin
Work the quote as three blocks, not a single per-m² figure:
- Groundworks/foundations — day rate for excavation, hardcore, concrete, cure-time scheduling (or ground screw install if soil suits). This is the block most tradespeople under-time — a "quick pergola" job routinely loses money here because concrete footings need a return visit after cure.
- Frame assembly — posts, beams, rafters. Time this by bay count, not overall area: a 3-bay pergola (three post pairs) takes roughly the same per-bay time whether the bays are 2m or 3m wide, because most of the labour is in joints, plumb-checking, and bracing, not linear cutting.
- Roof covering and finishing — open frame needs no extra time beyond the frame itself; louvred/polycarbonate roofing adds 4–8 hours; motorised bioclimatic systems need a sub-contracted or in-house electrician for 2–4 hours plus commissioning.
Apply your standard markup on materials (typically 15–25%) and price labour at your day rate. Add 10–15% contingency for ground condition unknowns (tree roots, buried services, unexpectedly soft ground) — this is a garden job, and what's under the turf is rarely fully known until you dig.
Worked example — 3×4m softwood pergola with polycarbonate roof, concrete footings
Existing patio abuts the pergola footprint but footings need to go into a border, standard London clay subsoil, side access available.
- Site visit + planning check (PD height/coverage, Conservation Area check): 0.5 hr — included in quote
- Materials: pressure-treated softwood posts/beams/rafters (£650), polycarbonate roof panels + fixings (£420), concrete + hardcore for 4 footings (£90), fixings/brackets (£80) = £1,240 materials
- Labour: 2-person team, 2.5 days (day 1 excavate + pour footings; day 2 return after cure to erect frame; day 3 half-day roof + finish) at £350/day team rate = £875
- Waste disposal (turf, spoil, offcuts): £120
- Subtotal cost: £2,235
- Margin (20%): £447
- Net price (cost + margin): £2,682
- Quoted price: £3,220 inc. VAT (£2,682 + 20% VAT)
Worked example — 3×4m aluminium bioclimatic pergola, motorised louvre
Ground-floor rear garden, existing paved patio, electrical supply run from house consumer unit.
- Kit cost (aluminium frame, motorised louvre roof unit, rain/wind sensors): £5,800
- Base plate fixings into existing patio (no new footings needed): £120
- Assembly labour, 2-person team, 1.5 days: £525
- Electrician: consumer unit circuit, weatherproof isolator, motor wiring, commissioning, Part P notification: £480
- Subtotal cost: £6,925
- Margin (18%, kit-heavy job with lower labour risk): £1,247
- Net price (cost + margin): £8,172
- Quoted price: £9,800 inc. VAT (£8,172 + 20% VAT)
Pricing traps specific to pergolas
- Underestimating footing cure time — a concrete-footing pergola is a two-visit job by design (excavate/pour, then return after 7 days minimum to load the posts). Quoting it as a single day's work is the most common way pergola jobs run over.
- Missing the electrician for louvre/lighting systems — bioclimatic pergolas, integrated LED strip lighting, or infrared heaters all need an electrical first fix. If you're not an electrician, cost in a sub-contractor quote before pricing the job, don't estimate it.
- Not pricing the planning check separately — if a client's garden is in a Conservation Area or near a boundary that raises height/coverage questions, the pre-job check is real, billable time — see pergola planning for the specific limits to check against.
- Underpricing access-restricted jobs — carrying concrete, timber, and roofing materials through a house because there's no side access can double the labour time for materials handling alone.
Frequently Asked Questions
Should I price by square metre or by the job?
By the job. Square-metre pricing works reasonably for decking or paving where labour scales roughly linearly with area, but pergola labour is dominated by post/footing count and roof type, not floor area. A 3×3m pergola with 4 posts and an open roof can cost less than a 3×3m pergola with a motorised louvre roof and integrated lighting — same footprint, very different job.
How do I price for ground I haven't seen yet (remote quote)?
Don't provide a firm price without a site visit for anything with concrete footings — ground condition (clay, rubble-filled ground, tree roots, buried services) is the single biggest unknown cost driver. If a remote estimate is unavoidable, quote a range and state clearly that the firm price follows a site visit.
What's a reasonable margin on a pergola job?
15–25% is typical, similar to other landscaping/garden structure work. Kit-based aluminium systems (lower labour risk, higher material cost) can run a slightly lower percentage margin since less of your time is exposed to ground-condition risk; bespoke oak-frame builds carry more labour risk and usually justify the higher end of the range.
Does the client's climbing plant request change the price?
Yes — flag it at quoting stage. A pergola designed to carry a mature wisteria or climbing rose needs larger-section beams and deeper/wider footings than a bare structure (see the loading guidance in pergola planning). Retrofitting this after the frame is built means starting again — price for the eventual load, not just the day-one appearance.
Regulations & Standards
GPDO 2015 Schedule 2, Part 1, Class E — permitted development limits for pergolas/outbuildings; see pergola planning for full detail.
BS 8417:2024 — preservation of wood, use class specification for treated timber posts (supersedes BS 8417:2011+A1:2014 with effect from 15 August 2024).
BS EN 1995-1-1 (Eurocode 5) — structural timber design, relevant for beam/post sizing on larger spans.
BS 7671:2018+A4:2026 — IET Wiring Regulations, applies to any electrical supply for motorised louvres, lighting, or heaters.
Building Regulations Part P — notification required for new circuits to garden structures.
HSE — Working at height and manual handling on small landscaping sites
pergola planning — permitted development limits, foundation design, timber specification
garden room pricing guide — comparable garden-structure pricing model and cost breakdown approach
garden decking pricing guide — adjacent garden landscaping pricing for cross-selling
decking permits — planning/Building Regs overlap for combined decking + pergola jobs