Small project, big decisions. A porch touches foundations, brickwork, roofing and electrics — and prices vary wildly between regions and suppliers. To cut the guesswork, our Porch Cost Calculator gives you a clear mid-market UK estimate for the essentials: base, brick/render wall area, roof type and electrics, all adjusted by your postcode.
Use it to scope options in minutes, see where the money goes, and decide whether to reuse parts of an existing porch or build new. If your footprint tips over 3 m², we’ll also flag a typical planning + drawings allowance and the usual 6–8 week decision window.
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Launch the tool: Porch Cost Calculator
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Price doors, side lights and glazing via our: Double Glazing Cost Calculator
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Want monthly figures? See our Finance Calculator
TL;DR (quick ranges, supply + installation)
These are typical mid-market UK figures our calculator uses, before the postcode factor (regions can run roughly −4% to +12% versus UK average):
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Concrete base + strip foundations: £320–£450 per m² (add ~25% if replacing a failed base).
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Brick-faced cavity wall (new build): £170–£230 per m².
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Rendered cavity wall (new build): £150–£210 per m².
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Roofs (by plan area):
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Flat: £220–£300 per m²
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Pitched: £280–£360 per m²
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Gable / double-hipped: £320–£380 per m²
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Electrics: first feed £300–£400; extra feed £100–£150; first downlight £90–£130; additional downlights £55–£85.
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Planning pack (if >3 m²): typical combined £550–£750 (application + basic drawings/admin).
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Glazing & doors: price separately in our Double Glazing Cost Calculator and add to your porch total.
These ranges aim for the middle of the market (not the cheapest DIY, not the top-end national premiums).
How the Porch Cost Calculator works
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Postcode factor
Enter your postcode first. We apply a light regional adjustment (for labour & logistics) so estimates are realistic locally. -
Existing base?
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Yes: choose Reuse (no base cost) or Replace (adds removal + new base).
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No: we’ll estimate a new base cost from your sizes.
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Size
Enter width (front), projection (from the wall) and overall height. The calculator derives plan area from width × projection. -
Wall finish & m² to build
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Reusing walls? Select Use existing walls and set 0 m².
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Building new? Choose Brick or Render and enter the m² you need to construct.
Quick method: (projection × height × 2) + (width × height) − any door/window openings.
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Openings (door/window)
Use this to note if you’ll leave an opening. Price the actual door(s) and glazing in the Double Glazing Calculator, then add those items to your project list. -
Roof type
Pick Use existing or a new Flat/Pitched/Gable/Hipped roof. Costs scale by plan area. -
Electrics
Add a first feed (supply spur for lights/sockets), extra feeds if needed, and downlights. -
Planning check
If your footprint goes over 3 m² (and you’re not reusing the existing base), we display a typical planning + drawings allowance and the usual 6–8 week timeframe. -
Add to list + email/share
Build a basket of options, email yourself a summary, or request quotes within or under the range.
Example costings (illustrative)
Mid-market, supply + installation, incl. VAT. Your postcode factor may adjust these.
Example A — Small porch, reuse base (no planning)
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Size: 2.0 m (W) × 1.2 m (P) × 2.2 m (H) → 2.4 m²
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Walls: render, 7.0 m² (two sides + small upstand, minus door)
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Roof: new flat
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Electrics: first feed + 2 downlights
Estimated total: £3,000–£4,000
Example B — Medium porch, new base (planning likely)
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Size: 2.6 m × 1.4 m × 2.3 m → 3.64 m² (>3 m²)
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Walls: brick, 10.5 m²
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Roof: new pitched
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Electrics: first feed + 1 extra feed + 4 downlights
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Planning pack: included
Estimated total: £5,400–£7,200
(Add door/glazing from the Double Glazing Cost Calculator to complete the picture.)
Planning rules (quick UK refresher)
Most porches are permitted development if all of the following are true:
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The external area is 3 m² or less.
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The overall height is 3 m or less.
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It isn’t within 2 m of a boundary that fronts a highway.
Exceed those and your council will typically want a Householder application. Our calculator flags this and includes a typical allowance for the application and basic drawings. Always confirm with your local planning authority for edge cases and conservation areas.
Roof types at a glance
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Flat roof: the most affordable; simple detailing, modern look.
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Pitched: classic appearance; better water run-off.
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Gable / double-hipped: more architectural interest and light, usually the priciest per m².
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Reuse existing: if sound and watertight, this keeps costs down.
Electrics — what’s actually included?
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First feed: supply spur into the porch (for lighting/sockets on that circuit).
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Extra feeds: additional circuits (e.g., a separate external light or socket run).
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Downlights: we separate first vs additional to mirror common pricing.
If you’re planning anything beyond the basics (smart switches, PIR sensors, external lanterns, underfloor heating), note it for survey — we’ll price it precisely.
How to measure brick/render wall m² (fast)
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Two side walls: projection × desired height × 2.
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Front upstand: width × height.
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Subtract openings: (door width × height) + any window openings.
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Reusing existing walls? Enter 0 m².
Tip: don’t forget the usable height beneath the roof soffit (not the overall ridge).
Regional factor — why we ask for your postcode
Labour rates, haulage, and supplier lists vary. We apply a light regional uplift (roughly −4% to +12% across the UK) so your estimate better reflects what local installers actually charge.
Common pitfalls (and how to avoid them)
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Under-counting wall area. Measure from finished ground to underside of roof soffit; subtract door/window openings.
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Forgetting drainage/ground issues. Allow a contingency if manholes or drainage runs sit under your footprint.
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Mixing glazing costs in the porch figure. Keep porch fabric and glazing separate; add window/door items from the Double Glazing Calculator.
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Assuming re-use is always cheaper. If an existing base or roof is failing, replacement can be better value than patching.
What to do next
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Price your porch now: Porch Cost
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Add doors, side lights and glazing: Double Glazing Cost
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See monthly payment illustrations: Finance Calculator
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Prefer firm quotes? Use “Get quotes within the price range” in the calculator — we’ll line up vetted local installers.
FAQ (short)
Do I need planning permission?
If your porch is ≤3 m², ≤3 m high, and ≥2 m from a highway-fronting boundary, you’re usually fine under permitted development. Over that, expect to apply (we flag it automatically).
Can I reuse my existing base/roof/walls?
Yes — choose the Use existing options in the calculator. We’ll remove those build costs from the estimate.
Are prices supply + installation?
Yes, they reflect typical mid-market installed prices, incl. VAT.
Why are national brand quotes often higher?
Large overheads, sales commissions and brand pricing. Our ranges aim for the middle of the market most homeowners actually pay.
Where do I price the door and glazing?
Use the Double Glazing Cost Calculator here: https://bestpricevalue.com/double-glazing-cost-calculator/.
Add those items to your porch estimate.
We’re a Home Improvement Agency. These figures are guidance, not a contract. Final quotes depend on survey, specification and local conditions.
