How to Price a Fireplace Installation: Labour, Materials and Margin Guide
Quick Answer: A typical UK fireplace installation runs £1,200–£4,500 for the builder's work — opening up the chimney breast, forming or lining the builder's opening, fitting the hearth, surround and chamber finish — before the appliance itself. The single biggest cost driver is the appliance choice: an electric fire needs no flue and can drop the job below £800, whereas an open fire or inset stove may need the flue opened up, swept and lined (£900–£2,500 on its own). Building Regulations Approved Document J governs hearth dimensions, clearances, flue and ventilation; this is a price-materiality issue, not a footnote — get the hearth wrong and the appliance cannot be commissioned.
Summary
Pricing a fireplace installation is one of the more variable jobs a UK builder will quote because "fireplace" can mean four very different scopes of work. A homeowner with a sound, lined flue who wants a decorative surround and an electric fire is a half-day job. A homeowner with a long-closed-up chimney breast who wants an open fire or a solid-fuel inset stove is a multi-trade project: opening up, sweeping, lining, forming the builder's opening, casting or fitting a constructional hearth, plastering the chamber, fitting a lintel or beam, and only then the surround.
The critical distinction this guide makes is between the builder's work (opening, chamber, hearth, surround, beam) and the appliance (open fire, stove, gas fire, electric fire). The appliance brings its own regulatory regime — HETAS or a Building Control notification for solid fuel, Gas Safe for gas — and its own commissioning requirements. The builder's quote must be scoped so the appliance can legally and safely be commissioned on top of it. The most common quoting failures are under-sizing the hearth for an open fire, ignoring the flue's condition, and omitting the carbon monoxide alarm.
This article covers realistic 2026 UK labour and material costs, where margin sits, the inclusions and exclusions that protect you on price, and the regulations you must reference. It does not cover the appliance installs in depth — see the linked log-burner and gas-fire guides for those.
Key Facts
- Builder's work only (no appliance) — £1,200–£4,500 depending on whether the flue is opened up and lined.
- Decorative surround + electric fire (sound wall) — £600–£1,500 all-in; no flue, no Part J hearth for the appliance.
- Constructional hearth (open fire / solid fuel) — must project at least 500 mm in front of the appliance recess and at least 150 mm beyond each side of the opening, and be at least 125 mm thick.
- Decorative (superimposed) hearth — when laid on a constructional hearth, the appliance hearth for solid fuel must be at least 840 mm × 840 mm if free-standing, or 840 mm wide in a recess.
- Opening up a blocked breast — £350–£900 labour, plus skip/waste £200–£400.
- Flue sweep before commissioning — £60–£120; mandatory before any solid-fuel appliance is signed off.
- Flexible flue liner (904-grade, solid fuel) — £45–£90 per metre supplied; typical 4.5–6 m chimney = £300–£600 in liner plus fitting.
- Lintel / RSJ over opening — £150–£600 supplied; structural calc and Part A apply if load-bearing.
- Solid timber / reclaimed beam (bressummer) — £120–£500 supplied depending on size and reclaim.
- Surround material range — softwood/MDF £150–£400; hardwood £300–£800; cast iron £400–£1,500; limestone/marble £500–£2,500+.
- Chamber render/plaster (heat-resistant) — £200–£500; standard gypsum plaster must not be within prescribed distance of an open fire.
- Carbon monoxide alarm — £20–£40; legally required where a solid-fuel or combustion appliance is installed.
- Air supply / vent — a permanently open air vent is required for appliances over a rated output threshold; for solid fuel typically above 5 kW.
- VAT — 20% standard rate on most domestic fireplace work; reduced rates only apply to specific qualifying energy/renovation schemes.
- Day rate (builder/multi-skilled) — £200–£320/day; specialist fireplace fitter £250–£400/day.
Quick Reference Table
Spending too long on quotes? squote turns a 2-minute voice recording into a professional quote.
Try squote free →| Element | Typical Cost | Notes |
|---|---|---|
| Open up blocked chimney breast | £350–£900 labour | Plus waste removal £200–£400 |
| Chimney sweep (pre-commission) | £60–£120 | Mandatory for solid fuel sign-off |
| CCTV flue inspection | £80–£180 | Confirms flue is sound before lining |
| Flexible flue liner (supplied) | £45–£90 / metre | 904-grade for solid fuel; 316 for gas |
| Liner installation labour | £250–£550 | Includes top plate, cowl, register plate |
| Form/repair builder's opening | £300–£800 | Brick/block to BS sizes |
| Lintel or RSJ over opening | £150–£600 supplied | Part A + structural calc if load-bearing |
| Reclaimed/solid beam (bressummer) | £120–£500 | Decorative or structural |
| Constructional hearth (cast/precast) | £250–£700 | Min 125 mm thick, 500 mm projection |
| Decorative hearth (slate/stone/granite) | £150–£900 supplied | Sits on constructional hearth |
| Chamber render (heat-resistant) | £200–£500 | Not standard gypsum near open fire |
| Surround — timber/MDF | £150–£800 | Fitting £150–£300 |
| Surround — cast iron | £400–£1,500 | Heavy; needs fixing into masonry |
| Surround — marble/limestone | £500–£2,500+ | Specialist handling, two-person lift |
| Carbon monoxide alarm | £20–£40 | Legally required for combustion appliances |
| Air vent (cored + grille) | £80–£250 | Required above kW threshold |
Detailed Guidance
Opening Up and Forming the Builder's Opening
A large share of fireplace jobs start with a chimney breast that was blocked off — often boarded over with a vent, sometimes bricked up entirely. The first scope decision is how much demolition is needed. Carefully removing a plasterboard infill is light work; chasing out a fully bricked-up opening, removing old back boilers or concrete infill, and breaking out a failed hearth is heavy, dusty work that generates real waste.
Budget £350–£900 in labour for opening up, and never bury the waste cost inside it — a builder's bag or small skip is £200–£400 and clients forget it exists until it appears on the invoice. Once open, you are looking at the condition of the builder's opening: the masonry recess that houses the fire. For an open fire or inset stove this often needs reforming to a standard size, squaring up the reveals, and rebuilding the throat or fitting a throat-forming lintel. Quote this as a distinct line — "form builder's opening to standard size" — at £300–£800 so the client sees it is separate from the cosmetic surround.
When you break in, inspect for: an existing constructional hearth (is it sound and the right size?), the lintel over the opening (cracked, sagging, or absent?), and the flue's condition. Each of these can turn a £1,500 job into a £3,500 job, which is exactly why the quote should be conditional on what is found behind the wall. State assumptions explicitly.
Hearths and Part J
The hearth is where most pricing and compliance mistakes happen. There are two hearths to think about:
- Constructional hearth — the solid, non-combustible base built into the floor structure. For a solid-fuel open fire or appliance, this must be substantial: at least 125 mm thick, projecting at least 500 mm in front of the appliance opening and extending at least 150 mm beyond each side. If the existing constructional hearth is too small or has been broken out, you are casting or laying a new one — that is £250–£700 and it must cure before tiling.
- Decorative / superimposed hearth — the visible slate, granite, limestone or tiled hearth laid on top. For a freestanding solid-fuel stove the appliance (decorative) hearth is commonly required to be at least 840 mm × 840 mm, and clearances to combustibles depend on the appliance manufacturer's instructions.
For an electric fire on a sound, non-combustible wall, no Part J hearth is required — this is purely cosmetic and is the single biggest reason electric installs are cheap. For gas, the hearth requirement depends on the appliance type (a decorative fuel-effect gas fire has different rules to an inset live-fuel-effect fire) and is determined by the Gas Safe engineer, but the builder usually still lays a decorative hearth.
Price the hearth as its own line and reference the dimension assumption. If the client later swaps from electric to a stove, the hearth scope — and price — changes materially.
Surrounds and Beams
The surround is the part the client cares about visually and the part where material choice drives cost more than labour. From cheapest to dearest:
- Softwood / MDF surround — £150–£400 supplied, painted on site. Fast to fit.
- Hardwood (oak, etc.) — £300–£800. Heavier, needs careful fixing.
- Cast iron — £400–£1,500. Heavy, often a combined insert-and-surround; needs fixing back into masonry and a two-person lift.
- Limestone / marble — £500–£2,500+. Specialist handling, frequently delivered in sections, easily chipped, and a damaged £900 mantel is your cost, not the client's. Build a breakage contingency into your margin.
Fitting labour is typically £150–£300 for timber, more for stone where levelling and bonding the legs and mantel is fiddly.
A beam (bressummer) over the opening is both a structural and a style decision. A reclaimed oak beam used decoratively is £120–£500 supplied. If it is genuinely carrying load it is a structural member and Part A applies — get the calculation. Critically, a timber beam must be kept a safe distance from the appliance and flue gases; manufacturer and ADJ clearances apply, and a low timber beam over an open fire is a fire risk and a sign-off failure. Where a structural opening is needed, a steel lintel or RSJ (£150–£600 supplied) carries the load and the beam is fixed below it decoratively.
Appliance Choice and Flue
This is the decision that swings the quote by thousands, so make the client choose early:
| Appliance | Flue needed | Regulatory route | Cost impact |
|---|---|---|---|
| Electric fire | None | Electrical (Part P) only | Lowest — no flue, no Part J hearth |
| Decorative gas fire | Yes (lined) | Gas Safe registered | Medium — flue + Gas Safe commission |
| Inset / freestanding stove | Yes (swept + lined) | HETAS or Building Control | Higher — full flue + hearth + air |
| Open fire | Yes (swept, sound, often lined) | Building Control / ADJ | Highest — biggest hearth, air, draught |
If the appliance burns fuel, the flue is in scope. Before sign-off the flue must be swept (£60–£120) and ideally CCTV inspected (£80–£180). If the flue is unlined, cracked, or oversized for the appliance, it needs a flexible liner — 904-grade stainless for solid fuel, 316-grade for gas — at £45–£90/metre supplied plus £250–£550 to install with top plate, cowl and register plate. A typical 4.5–6 m chimney totals £550–£1,150 lined and fitted. This is the line most under-quoted because the chimney's condition is invisible until inspected; quote it provisionally and confirm after CCTV.
Ventilation: solid-fuel and many gas appliances above a rated output (for solid fuel, commonly above 5 kW) require a permanently open air vent to supply combustion air. Cored hole plus grille is £80–£250. Omitting it fails commissioning.
The actual appliance install — connecting and commissioning the stove or gas fire — is carried out by the HETAS or Gas Safe engineer and is covered in the dedicated guides. Make clear in your quote whether you are providing that engineer or whether the client arranges it.
Labour, Materials and Margin
Fireplace work is labour-heavy on the messy stages (opening up, hearth, chamber) and material-heavy on the visible stages (surround, hearth finish). A realistic build-up for a mid-range solid-fuel-ready install with the builder doing everything except the HETAS commission:
- Open up + waste: £600
- Form opening + lintel: £550
- Constructional hearth: £450
- Flue sweep, CCTV, liner supplied + fitted: £900
- Chamber heat-resistant render: £350
- Surround (cast iron) supplied + fitted: £1,100
- Decorative hearth supplied + fitted: £450
- CO alarm + air vent: £200
- Subtotal materials + labour ≈ £4,600, before HETAS commission and before VAT.
Apply your markup on materials in the usual way and price labour at your day rate (£200–£400/day for this trade). Margin on fireplace work should be protected by a stone-breakage contingency and a flue-condition contingency — the two costs most likely to overrun. Do not absorb a £900 cracked marble mantel or an unexpected liner into a fixed price you quoted blind.
Common Mistakes
- Under-sizing the hearth. The 500 mm front projection and 150 mm side extensions for solid fuel are not negotiable — get them wrong and the appliance cannot be signed off.
- Ignoring the flue. Quoting an open fire or stove without budgeting for sweeping, CCTV and likely lining. The flue is invisible and the most common overrun.
- No CO alarm. A carbon monoxide alarm is legally required where a combustion appliance is installed. £20–£40 and a sign-off blocker if missed.
- Standard plaster in the chamber. Gypsum plaster degrades near an open fire; use heat-resistant render where required.
- Timber beam too close to the opening. Decorative beams over open fires must respect clearance to combustibles — a fire risk and a fail.
- Forgetting the air vent. Above the kW threshold a permanent vent is mandatory.
- Quoting blind. Always make the price conditional on what is found when the breast is opened, and confirm liner cost after CCTV.
Frequently Asked Questions
How much does it cost to install a fireplace in the UK?
For the builder's work — opening up, forming the opening, hearth, chamber and surround — expect £1,200–£4,500 depending on whether the flue must be opened up and lined. A simple decorative surround with an electric fire on a sound wall can be £600–£1,500 all-in. The appliance commissioning (HETAS or Gas Safe) is additional.
Do I need Building Regulations for a fireplace?
Yes, in almost all cases where a fuel-burning appliance is involved. Approved Document J covers the hearth, flue, ventilation and CO alarm. Solid-fuel work is notified either through a HETAS registered installer (self-certified) or directly to Building Control. Any structural opening or beam brings Part A into play. A purely decorative electric fire on a sound wall has no Part J appliance requirement but any electrical work is under Part P.
Open fire vs stove vs electric — which is cheapest to install?
Electric is cheapest because it needs no flue and no Part J hearth — often under £800 installed against a sound wall. A stove or open fire is dearer because the flue must be swept, inspected and usually lined, a substantial constructional hearth is required, and air supply and CO provisions apply. An open fire typically costs the most due to the largest hearth and draught requirements.
What hearth do I need for a wood burner or open fire?
For solid fuel you need a non-combustible constructional hearth (commonly at least 125 mm thick, projecting at least 500 mm in front and 150 mm to each side of the opening) and a decorative hearth on top (commonly at least 840 mm × 840 mm for a freestanding stove). Clearances to combustibles follow the appliance manufacturer.
Who installs the actual fire — the builder or a specialist?
The builder does the opening, hearth, chamber, surround and beam. The appliance itself must be commissioned by the appropriate competent person: a HETAS registered installer for solid fuel (or Building Control notification), and a Gas Safe registered engineer for gas. Make clear in the quote which party provides that engineer.
Regulations & Standards
Building Regulations Approved Document J (Combustion appliances and fuel storage systems) — governs hearths, hearth dimensions, flues, clearances to combustibles, air supply/ventilation, and the requirement for a carbon monoxide alarm where a fixed combustion appliance is installed. All hearth dimensions in this article are marked and must be checked against the current published edition before quoting.
HETAS — the recognised Competent Person Scheme for solid-fuel and biomass appliances; a HETAS registered installer can self-certify compliance with Part J. Otherwise the work must be notified to Building Control.
Gas Safe Register — any gas fire must be installed and commissioned by a Gas Safe registered engineer. It is illegal for an unregistered person to work on gas appliances.
Building Regulations Approved Document A (Structure) — applies to any new or enlarged structural opening and to load-bearing lintels, RSJs or beams; a structural calculation is required.
Building Regulations Approved Document P (Electrical safety) — applies to the electrical supply for an electric fire or stove fan/electrics.
UK only. Where a specific dimension or threshold is marked, confirm against the current government-published Approved Document before relying on it in a quote.
Approved Document J: Combustion appliances and fuel storage systems (gov.uk) — hearths, flues, ventilation, CO alarms.
Approved Document A: Structure (gov.uk) — structural openings and beams.
HETAS — guidance for installers and consumers — solid-fuel competent person scheme.
Gas Safe Register — legal requirement for gas appliance work.
Approved Document P: Electrical safety (gov.uk) — electric fire supply.