How to Price a Log Burner or Wood Burning Stove Installation: Labour, Liner and Hearth

Quick Answer: A typical UK log burner installation costs £2,400–£4,500 supply-and-fit in 2026, depending on stove choice, flue route and hearth requirements. Stove cost £600–£2,500; flexible 904-grade twin-skin chimney liner £400–£900 supplied; hearth and surround £200–£800; HETAS-registered installation labour £600–£1,200 for a straightforward chimney install. New-build twin-wall flue installations (no existing chimney) add £1,200–£2,500. Building Regulations Document J compliance is mandatory; HETAS or LABC sign-off required.

Summary

The wood burning stove market remains strong despite urban anti-pollution rhetoric — an Ecodesign 2022-compliant stove is a legitimate, regulated heat source even in DEFRA Smoke Control Areas, provided it's a DEFRA-exempt model burning seasoned wood. The fitting business divides cleanly into two categories: stoves into existing chimneys (the bread and butter, 70%+ of installs) and twin-wall flue systems where there's no chimney (loft conversions, new extensions, modern open-plan houses).

For an installer pricing the work, the key variables are flue length, hearth construction, the stove model and the customer's expectations on the surround. A like-for-like replacement in an existing fireplace with a sound chimney is a one-day job for a HETAS-registered fitter. A first-time install in a modern house requiring a new twin-wall through a loft and out a metal-clad chimney is two days plus scaffold.

The compliance side is non-negotiable. Building Regulations Approved Document J governs solid fuel appliances; sign-off is via HETAS competent persons scheme (cheapest, most common) or LABC inspection (more expensive, slower). Without certification, the installation is illegal, the customer's home insurance may be invalid, and the customer cannot sell the property without resolving it. Quote with HETAS sign-off included as a standard line item.

Key Facts

• Standard stove (5 kW Ecodesign) — £600–£1,500 supply only
• Premium stove (5 kW, designer brand) — £1,500–£3,500 supply only
• Multi-fuel stove (wood + smokeless coal) — £700–£1,800 supply only
• DEFRA-exempt for Smoke Control Areas — required in most UK urban areas; £100–£300 premium
• Chimney sweep before survey — £80–£140 (mandatory before installation)
• Smoke test — £80–£150 (after sweep, before liner installation)
• Chimney liner — flexible 904-grade twin-skin — £45–£75 per metre supply only
• Standard 6 m liner kit (with cowl, register plate) — £400–£900 supplied
• Insulating backfill (vermiculite) — £40–£90 per 100 L bag
• Twin-wall flue (per metre) — £80–£140 supply only
• Twin-wall typical 4–6 m run — £900–£1,800 supplied
• Hearth (standard, in front of fireplace) — £80–£300 supply
• Hearth (12 mm thick non-combustible, free-standing) — £150–£500
• Hearth (raised stone hearth) — £400–£1,500
• HETAS-registered installation labour — £350–£600 per day; typical install 1–2 days
• HETAS certificate — included in install (£0 marginal cost to customer)
• Building Regulations sign-off (LABC alternative) — £150–£350
• Annual sweep — £80–£140 thereafter
• Standards — Building Regulations Approved Document J, BS EN 13240 (room heaters)

Quick Reference Table

Detailed Guidance

Stove Selection: kW Output and Compliance

Sizing is critical. An oversized stove makes the room uncomfortably hot and operates inefficiently, glowing red and fouling the chimney. Undersized and the stove can't keep up with heat demand. The rule of thumb:

• Room volume in m³ ÷ 14 = required kW (well-insulated modern home)
• Room volume in m³ ÷ 12 = required kW (standard insulation)
• Room volume in m³ ÷ 10 = required kW (poorly insulated, single-glazed)

A 5 m × 4 m × 2.4 m lounge (48 m³) in a typical UK home needs a 4–5 kW stove. The customer asking for a "big 12 kW stove" for their average lounge will roast in it; redirect to 5 kW.

Ecodesign 2022: Mandatory for all new stoves sold from January 2022. Requires lower particulate emissions, higher efficiency. All current stove models are Ecodesign-compliant.

DEFRA Smoke Control Area exemption: In most UK urban areas, you can only burn wood in a DEFRA-exempt stove. The exempt list is published on GOV.UK and continually updated. Confirm DEFRA exemption before quoting the stove model in a Smoke Control postcode.

Chimney Survey: Before You Quote

Always survey the chimney before quoting. The procedure:

1. Sweep first (£80–£140) — clear soot and debris before inspection
2. CCTV survey — borescope or chimney camera, look for cracks, displaced bricks, parging breaks
3. Smoke test — light a smoke pellet at the bottom; check for leaks at all storeys
4. Measure flue size and length — typical 200 × 200 mm masonry flue, 6–9 m length

If the chimney has any of:

• Cracked or missing parging
• Displaced bricks at the top
• Failed or absent damp-proof course at the chimney base
• Very large flue (>250 mm internal) — needs a liner regardless

— a flexible liner is essential. Most installs benefit from a liner anyway; modern stoves create cooler flue gases that condense in oversized flues, causing tar build-up and corrosion of the masonry.

Liner Selection and Installation

Flexible 904-grade stainless steel twin-skin liner is the standard. The 904 alloy resists chloride corrosion (key for log burning, which produces hydrochloric vapour). 316-grade liners are cheaper but rated for gas only — never specify for solid fuel.

Sizing:

• 5 kW stove — 150 mm liner standard
• 5–10 kW — 150 or 175 mm
• 10 kW+ — 175 or 200 mm

Installation:

• Drop liner from top, with rope and weighted pull-down at the base
• Connect to stove flue spigot with stove-rope sealed flue adaptor
• Top of chimney: terminal cap and storm collar
• Insulating backfill (vermiculite) poured around liner — improves draft and prevents condensation

Cost £400–£900 supplied for a typical 6–8 m liner kit including cap and adapter.

Hearth Requirements

Approved Document J specifies:

• Hearth area — extends 300 mm in front of stove, 150 mm to either side
• Hearth thickness — 12 mm minimum non-combustible, 250 mm minimum if also a structural hearth
• Stove-to-combustible distance — manufacturer-specified (typically 100–400 mm)
• Stove-to-non-combustible (e.g. brick) — manufacturer-specified

Standard slate or stone hearth £150–£400; raised hearths with steps £600–£1,500 depending on stone choice.

For hearths on suspended timber floors, structural reinforcement may be needed — joists either side of the stove location, with non-combustible board and mortar bed beneath the stone.

Fireplace Opening

Most installs are into an existing fireplace opening. The work:

• Strip out existing fire (gas log effect, electric fire, old open fire grate)
• Remove cast-iron register plate if present
• Sweep and survey chimney
• Install new register plate around liner penetration
• Install carbon monoxide detector (mandatory under Building Regulations Part J Approved Document)
• Stove fitted, sealed to liner with stove rope and gasket
• Hearth installed
• Surround/mantel installed (often supplied separately)

Twin-Wall Flue (No Chimney)

For new-build installs or properties without a chimney, twin-wall insulated flue runs from stove vertically up through the building. Construction:

• 6" inner diameter, 50 mm insulation, outer skin
• Sections jointed with locking bands
• Brackets at every floor level
• Through-roof flashing kit
• Termination 600 mm above ridge in centre of roof, or 1 m above any opening within 2.3 m horizontal

Cost: roughly £80–£140 per metre supplied + £80–£140 per metre fitted, plus brackets, flashings, terminations.

Sign-Off Routes

HETAS competent persons scheme (most common):

• HETAS-registered installer self-certifies
• Certificate emailed to customer + Building Control + HETAS database
• £0 marginal cost (covered by annual HETAS membership)
• 30-day limit from completion to certification

LABC route:

• Building Control notification, fee £150–£350
• Local Authority inspector visits, signs off
• Customer's choice if no HETAS-registered installer used
• Slower (typically 1–4 weeks for inspection)

Carbon Monoxide Alarms

Mandatory under Building Regulations:

• Audible CO alarm in same room as stove
• Smoke detector on each floor
• Compliant alarm to BS EN 50291

Cost: £20–£40 per alarm. Add to quote as a line item.

Frequently Asked Questions

Can a customer fit their own stove?

Legally yes (DIY is permitted) but they must self-notify Building Control, pay the LABC fee (£150–£350), and pass inspection. DIY installs frequently fail inspection on hearth thickness, distance to combustibles, or flue terminal height. In practice, the customer pays more for DIY-then-fix-it than for a HETAS install from the start.

What stoves are DEFRA-exempt for London / Bristol / Manchester?

The DEFRA exempt list is on GOV.UK and continually updated. Most current Ecodesign stoves are DEFRA-exempt. Check the specific model before quoting. Note that the exemption only applies to wood and DEFRA-listed authorised fuels; it does not allow burning anything else in Smoke Control Areas.

How often does the customer need to sweep?

Annually for wood-only burning, twice yearly for multi-fuel (wood + coal). Many installers offer a sweep + service combo for £100–£160 annually as an aftercare package.

What about kiln-dried logs vs seasoned?

Kiln-dried (under 20% moisture) is the gold standard — ignites quickly, burns clean, low particulate emissions. Seasoned (air-dried 18–24 months, under 25% moisture) is acceptable. Wet wood (over 25% moisture) is illegal to sell as Ready to Burn-certified and produces twice the particulate emissions plus chimney tar.

Can the customer use their existing chimney without a liner?

Only if the chimney is in perfect condition (smoke test passes, no cracks, sound parging, correct size for the stove). Most chimneys benefit from lining. Without a liner, modern Ecodesign stoves produce cooler flue gases that condense in unlined masonry, causing tar build-up and damp on chimney breasts. The £400–£900 for a liner is well-spent insurance.

Regulations & Standards

• Building Regulations Approved Document J — combustion appliances and fuel storage

• BS EN 13240 — solid fuel room heaters

• BS 8303 — installation of solid fuel appliances

• BS EN 1856-2 — chimneys: metal liners (904 grade specifications)

• DEFRA Air Quality (Domestic Solid Fuels Standards) (England) Regulations 2020 — solid fuel sales and Ecodesign

• Smoke Control Areas under Clean Air Act 1993

• HETAS technical requirements — best-practice install standards

• HETAS Approved Schemes — competent persons scheme for solid fuel

• Approved Document J — Building Regulations Part J

• DEFRA Smoke Control Areas — list and exempt fuels

• Stove Industry Alliance — industry trade body

• Ready to Burn Scheme — accredited wood fuel

• BS EN 13240 Standard — solid fuel room heater specification

• chimney sweeping and CCTV survey — pre-install chimney inspection

• chimney lining pricing guide — detailed liner pricing

• no heat from stove fault diagnosis — post-install fault routes

• heating system sizing — alternative heating approaches

• hot works and fire safety — installation site safety