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.
Planning the work? Check what it usually costs, or work out your own estimate. The free quote form is at the top of this page.
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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What’s in a porch price — and what isn’t
A porch is a small job with the same fixed costs as a big one — foundations, a door, and someone standing there for a week. That is why the price per square metre looks high next to a full extension.
| Line item | Typical 2026 cost | Usually included? |
|---|---|---|
| Foundations and base | £800–£2,000 | Yes — depth depends on ground and drains |
| Brickwork or frame | £1,200–£4,000 | Yes — brick costs more than uPVC and lasts far longer |
| Roof and tiling | £700–£2,000 | Yes |
| Front door and frame | £600–£2,500 | Often SEPARATE — check, it is a common gap |
| Glazing and windows | £400–£1,500 | Yes |
| Electrics — light and socket | £250–£600 | Usually separate; Part P notifiable |
| Moving or diverting drains | £500–£2,500 | No — only known once dug |
| Making good and decoration | £300–£800 | Frequently excluded |
| VAT | 20% | Check whether the quote is inclusive |
The most common surprise is a drain or an inspection cover inside the footprint. Ask each builder what their quote assumes and what the rate is if the base has to be redesigned around it.
How long a porch takes to build
One of the quickest ways to change the front of a house. Most of the schedule is curing time and the door lead time rather than labour.
| Stage | Typical duration | Notes |
|---|---|---|
| Foundations and base | 2–4 days | Plus curing before building off it |
| Brickwork or frame erection | 3–5 days | uPVC is quicker than brick |
| Roof and weathering | 2–3 days | Tying into the existing wall properly is the skilled part |
| Door, glazing and electrics | 1–2 days | Door lead time is often 2–4 weeks from order |
| Finishing and making good | 1–2 days |
One to three weeks on site for most porches. Order the door at the start, not the end — it is the item most likely to leave you with a finished porch and a hole in the front of the house.
How long a porch lasts
Build material decides almost everything here. A brick porch is a permanent part of the house; a uPVC one is a product with a service life.
| Type | Expected life | What fails first |
|---|---|---|
| Brick porch | 50 years+ | Nothing structural — the roof covering goes first |
| Timber-framed porch | 25–40 years | Down to maintenance at the base and joints |
| uPVC porch | 20–30 years | Discolouration, then seal and hinge failure |
| Roof covering (tile or slate) | 40–60 years | Flashing where it meets the house wall |
| Composite front door | 25–35 years | Hardware and seals long before the slab |
| Sealed glazed units | 15–25 years | Misting between the panes |
If you are choosing between brick and uPVC on price alone, compare over 25 years rather than up front. Brick usually wins on cost per year and is the version that adds to the valuation.
How to check a porch builder before you commit
Get it in writing
An itemised quote covering groundworks, structure, glazing specification, doors, electrics and waste. If two quotes differ, it is almost always because they cover different work.
Check the insurance yourself
Ask for the public liability certificate and confirm with the insurer that it is current and in the same trading name as the quote. A logo on a van proves nothing.
Ask who signs it off
Establish before work starts whether building control is involved and who notifies it. Getting a certificate retrospectively is slow, costs more, and it will surface when you sell.
On payment: a deposit for materials is normal; after that pay in stages against completed work. Never pay in full up front.
Registered members: House Extensions
13 businesses offering house extensions have a public profile with BestBuilders. Each listing is a business that registered with us directly; the details shown are the ones it declared at registration, and a Companies House number appears only where one was given.
All 13 registered house extensions businesses · Recent projects · Run a house extensions business? Add your free profile
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 BestBuilders' 2026 regional cost model (national cost guides × regional labour index). Last fact-checked: .
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Porch — guides and detail
The detail behind the number: what changes the price, the planning position, and how to check a quote before you accept it.