How Much Does a Porch Extension Cost in 2026 UK?
A small uPVC lean-to porch costs £2,800–£4,500 fitted in 2026, a brick-built front porch £4,500–£8,500 and a larger enclosed front porch £7,500–£14,000+. Most porches fall under permitted development if they're under 3m² floor area and ≤3m high — meaning no planning permission, no fees and a 2–4 week build.
Porch costs at a glance — 2026 UK
- Lean-to uPVC porch (1.5–2.5m²): £2,800–£4,500 · 1–2 weeks
- Brick-built front porch (2–3m²): £4,500–£8,500 · 2–3 weeks
- Enclosed front porch with WC/utility (3–5m²): £7,500–£14,000 · 3–5 weeks
- Glass-fronted modern porch (3–5m²): £8,500–£16,000 · 3–4 weeks
A typical 2.4m × 1.2m brick front porch in 2026 costs around £6,420 all-in (foundations, blockwork, tiled roof, composite door, side glazing). Most porches under 3m² floor area, ≤3m high and ≥2m from a public highway are permitted development — no planning needed.
Cost by porch type, 2026 UK
Prices include foundations, structure, roof, door and side glazing. London & the South East: add 12–18%. North England, Wales & Scotland: deduct 5–10%.
When does a porch need planning permission?
Under the UK General Permitted Development Order (Class D), a porch needs no planning permission if all four conditions are met:
- Floor area ≤3m² (measured externally)
- Height ≤3m above ground level
- At least 2m from any boundary fronting a highway
- The property is not a flat, listed building, or in some conservation areas
Building Regulations don't usually apply either — porches under 30m² floor area, with glazing and a separate external door from the main house, are typically exempt. The catch: if the porch creates a new heated space connected to the house (no external door between), Part L applies and the build cost rises by ~£600–£1,200.
Always check with your council's planning portal before signing — Article 4 directions in conservation areas can override permitted development rights.
Worked example: 2.4m × 1.2m brick front porch, Reading
3-bed semi in Reading. Owners want a brick-built front porch — matching London-stock brick, tiled pitched roof, composite front door, glazed side panel, tiled floor.
- Strip foundation & concrete pad: £950
- Brick & block walls (matched brick): £1,580
- Pitched timber roof & slate tiles: £1,180
- Composite front door (anthracite): £1,150
- Side glazed panel (double-glazed): £420
- Tiled floor & threshold: £340
- Electrics (1 light, 1 socket): £280
- Skim, paint, finishing: £520
Total: £6,420 inc. VAT. 18 working days on site. Falls under permitted development (2.88m² floor area, 2.7m height, 4m from highway). Estimated added resale value: £4,500–£7,800.
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Frequently asked questions
A small uPVC lean-to porch (1.5–2.5m²) costs £2,800–£4,500 supplied and fitted in 2026 UK, including a uPVC door. Build time is 1–2 weeks. The cheapest configuration is a 'pent roof' style against the existing front wall.
Most domestic porches don't need planning permission. Under Class D permitted development rights, porches under 3m² floor area, ≤3m high, and at least 2m from any boundary fronting a highway are permitted. Listed buildings and some conservation areas are exceptions.
A well-built brick front porch typically adds £4,500–£8,000 of resale value on a UK semi or terrace — often equal to or exceeding the build cost. uPVC lean-to porches add less (£1,500–£3,500) and may not fully recover their cost on premium properties.
A uPVC lean-to porch installs in 1–2 weeks. A brick-built front porch takes 2–3 weeks for a 2–3m² footprint. Larger enclosed porches (3–5m² with electrics, plumbing or a WC) take 3–5 weeks plus 1–2 weeks of lead time for materials.
A small uPVC lean-to porch is the cheapest, from £2,800 fitted. Pre-fabricated GRP porches sit slightly higher at £3,200–£4,800. Brick-built porches start at £4,500. The cheapest 'real' option for traditional kerb appeal is a hardwood timber-framed porch at £3,800–£5,500.
Yes — significantly. A 3m² porch at £6,000–£8,500 averages £2,000–£2,800/m². A small single-storey rear extension averages £2,200–£3,200/m² but rarely comes in under 8m² (~£20,000+). For pure entry-area extra space, a porch is the highest value-per-£ option.
Sources used in our 2026 figures
- Planning Portal — Porches and Permitted Development
- gov.uk — The Building Regulations 2010
- FMB — Federation of Master Builders cost benchmarks
- RICS BCIS — Building Cost Information Service
Methodology: Cost figures use representative quote data from BestBuilders' UK porch and extension specialist network (May 2026, 380+ vetted builders). Last fact-checked: .