Log Burner Installation Cost UK: Stove, Liner & HETAS

Quick Answer: A typical UK log burner installation prices at £2,400-£5,200 supply and fit including a DEFRA Ecodesign compliant stove (£600-£3,500), a 904-grade stainless steel flue liner (£40-£80 per linear metre), HETAS-registered installation labour (1-3 days at £350-£550/day), hearth, register plate, CO alarm and commissioning. All new and replacement wood-burning stoves installed in England since 1 January 2022 must meet the Ecodesign emissions limits set out in the Clean Air Strategy 2019, and stoves used in Smoke Control Areas must additionally be DEFRA-exempt under the Clean Air Act 1993. Installation must comply with Building Regulations Part J and is most easily certified via HETAS self-certification rather than a Building Notice.

Summary

Log burner installation is a year-round trade, with the demand spike running August to January as customers prepare for winter. The job sits at the intersection of three trades: HETAS-registered solid fuel installer (lead trade), builder (hearth, opening), and chimney sweep (pre and post-install sweep + smoke test). Pricing is dominated by the stove choice (£600-£3,500), the flue solution (lining an existing chimney with 904 stainless steel vs running a twin-wall flue system through a vertical or external route), and the hearth specification.

The biggest pricing mistakes are: quoting on a stove-only basis without including HETAS certification, underestimating twin-wall flue runs (which can hit £1,500-£3,500 in materials alone for a 4-6m external run), forgetting CO alarm to BS EN 50291-1 (legally required since October 2010), and not allowing for chimney sweep / smoke test as part of commissioning. Customers are often quoted £1,500 by online stove retailers for "supply and fit" and then receive a sting on the day when scaffolding, flue length, or chimney issues surface.

This guide covers: lining an existing masonry chimney, twin-wall external flue install, lined chimney with new hearth, and replacement of an existing solid fuel stove. For chimney sweeping pricing see related articles; for full chimney rebuilds see external render pricing guide and related masonry work.

Key Facts

• DEFRA Ecodesign requirement — all new wood-burning stoves installed in England from 1 January 2022 must meet Ecodesign 2022 emissions limits (particulate matter, NOx, OGC, CO)
• HETAS-registered installer — required for self-certification under Building Regulations Part J Competent Person Scheme
• Building Regulations Part J 2010 (Amended 2013) — Combustion appliances and fuel storage systems
• BS 8303 — Installation of domestic heating and cooking appliances burning solid mineral fuels
• Smoke Control Areas — stoves must additionally be DEFRA-exempt under the Clean Air Act 1993; check via gov.uk smoke control area map
• Small entry stove (4-5kW, single-skin) — £350-£650 supplied
• Mid-range stove (5-8kW, multi-fuel) — £600-£1,400 supplied
• Premium stove (Charnwood, Stovax, Morsø, Clearview) — £1,400-£3,500 supplied
• Cassette / inset stove — £700-£2,200 supplied
• 904-grade stainless steel flue liner — £40-£80/linear metre supplied
• 316-grade stainless steel flue liner — £25-£45/m supplied (lower spec; not suitable for closed appliances burning wood)
• Twin-wall insulated flue system (150mm Ø) — £85-£140/m supplied
• Twin-wall flue with bracket and storm collar (per linear m all-in) — £140-£220/m installed
• Register plate — £45-£90 supplied
• Stove glue / fire cement / rope seal kit — £25-£60
• Constructional hearth (570×840mm × 125mm concrete) — £150-£300 supplied
• Decorative hearth (slate, granite, oak) — £180-£900 supplied
• CO alarm (BS EN 50291-1 compliant) — £20-£45 supplied; mandatory under Building Regulations Part J
• HETAS installer day rate — £320-£480 regional, £400-£550 London
• HETAS notification fee — typically £25-£50 per install (included in HETAS membership)
• Chimney sweep (pre-install + smoke test) — £85-£140 each visit
• Scaffolding — £350-£900 for a 2-storey gable for 3-7 days; see scaffolding pricing guide
• Twin-wall external flue thermal expansion — flue chase / brackets must accommodate 5-15mm thermal movement per linear m
• Air supply — stoves rated 5kW or higher require dedicated air vent under Part J; minimum 550mm² per kW over 5kW
• VAT — 20% standard rate; no reduced rate applies for wood-burning stoves

Quick Reference Table

Detailed Guidance

DEFRA Ecodesign and Smoke Control Areas — Why Two Different Tests Matter

Two regulatory regimes apply to wood-burning stoves in England and they are commonly confused.

Ecodesign 2022 applies to all new and replacement wood-burning stoves installed anywhere in England from 1 January 2022. The Ecodesign emissions limits cover particulate matter (PM), nitrogen oxides (NOx), organic gaseous compounds (OGC) and carbon monoxide (CO). Almost every stove sold by reputable UK retailers is Ecodesign compliant — but second-hand and pre-2022 stock often is not. If you fit a non-Ecodesign stove post-2022 in a new install, you are non-compliant.

DEFRA-exempt is a separate test, applied only to stoves used in Smoke Control Areas. Smoke Control Areas are designated under the Clean Air Act 1993 and cover most urban centres in England including the whole of Greater London by default. In an SCA you can only burn "authorised fuels" or use a "DEFRA exempt" stove. The exempt stove list is published and maintained by DEFRA; check before quoting in any built-up area.

If you are installing in a Smoke Control Area, the stove must be both Ecodesign compliant AND on the DEFRA-exempt list. If outside an SCA, Ecodesign only.

Routing the Flue: Lining an Existing Chimney

The cheapest install scenario. The customer has an existing masonry chimney, the chimney has been swept and smoke-tested, the chimney is sound, and a 904-grade stainless steel liner is dropped down inside it.

Liner specification:

• Grade 904 — the standard for closed appliances (multi-fuel stoves). Resists wood-burning corrosion (acidic condensates). 20+ year service life.
• Grade 316 — single-wall, suitable for open fires and oil but NOT for closed wood-burning appliances. Many cowboys use 316; will fail in 3-7 years and void warranty.
• Diameter — typically 150mm for 5-8kW stoves; check manufacturer specification. Going smaller than spec causes downdraft, going larger causes condensation.
• Insulation — the void between liner and chimney should be backfilled with vermiculite or insulated to maintain flue gas temperature (prevents condensate)

Day 1-2 sequence for a lined-chimney install:

1. Chimney sweep (~1 hour, £85-£140)
2. Smoke test to verify chimney soundness (per BS 6461)
3. Erect roof access (ladder, scaffold tower or mobile scaffold; depends on storey height and tile pitch — for 2-storey gable allow scaffold £350-£900 for the duration)
4. Insert liner from top, secure top-plate and cowl
5. Backfill insulation
6. Fit register plate at base
7. Fit hearth (constructional + decorative)
8. Position stove on hearth, level, connect flue pipe to liner
9. Seal joints with fire cement and rope
10. Fit CO alarm (within room, 1-3m from stove, away from windows)
11. Commission stove — light, observe draw, check for smoke spillage
12. HETAS notification (online portal, 28 days for certificate)
13. Issue commissioning certificate to customer

Routing the Flue: Twin-Wall External

Where there is no chimney — a modern build, an extension, or a property where the chimney has been removed — a twin-wall insulated flue is fitted. Two common routes:

• External (out of side wall, up the outside) — flue exits horizontally through the wall at stove height, then runs vertically up the external wall to a height meeting BS EN 15287 (typically 600mm above ridge for buildings within 2.3m of ridge line, otherwise 1m above any opening within 2.3m)
• Internal vertical (straight up through ceiling and roof) — flue runs vertically inside the building through fire-stop floor and ceiling plates, then through the roof with weather flashing

Twin-wall flue is significantly more expensive than lining a chimney. Material cost £85-£140/m supplied and the bracket/storm-collar/cowl kit can add £180-£400. A 6m external flue with elbows is commonly £1,400-£2,200 in materials alone.

External routes require Building Regulations approval if changing the building external appearance significantly; HETAS self-cert covers the appliance install but planning permission may be needed if you're cutting through a chimney breast or in a conservation area.

Hearth Requirements — Part J Spelt Out

Building Regulations Part J 2010 specifies the constructional hearth requirements:

• Constructional hearth — minimum 125mm thick concrete, 840mm wide × 570mm deep (measured from front of stove); for stoves with low surface temperatures (<100°C at base) a 12mm thick non-combustible decorative hearth is acceptable
• Decorative / superimposed hearth — slate, granite, ceramic tile; sits on constructional hearth or directly on suitable floor for low-surface-temp stoves
• Clearance to combustibles — minimum 150mm to walls (sides/rear) unless stove manufacturer specifies less; the stove data plate is the authoritative source

The "12mm thick" route applies only to stoves the manufacturer specifically tests as having hearth surface temperatures below 100°C. Don't assume — check the data plate.

Air Supply (Combustion Air)

Stoves consume air. Modern airtight homes can starve a stove and create downdraft / smoke spillage. Part J requirements:

• Stoves under 5kW — no dedicated air vent required (in most cases); rely on adventitious air leakage
• Stoves 5kW and over — 550mm² per kW above 5kW; an 8kW stove needs 3 × 550 = 1,650mm² of permanent vent (typically a 100mm × 16.5mm slot vent or 125mm round vent grille)
• External direct air feed — many Ecodesign stoves have a 100mm direct-air inlet which can be ducted to outside; this satisfies the air supply requirement and avoids interior cold draught from the vent

Older houses (pre-1990) typically have enough natural leakage for stoves under 8kW. Modern new builds (post-2014 Part L) need direct air supply almost always.

HETAS Self-Certification vs Building Notice

Two routes to Building Regulations compliance for solid fuel appliances:

HETAS self-certification (recommended):

• Installer is HETAS registered (Competent Person Scheme)
• Notification submitted via HETAS portal within 30 days
• HETAS issues a Building Regulations Compliance Certificate to the customer (28 working days)
• No Building Control involvement, no fee beyond HETAS notification (£25-£50)

Building Notice route:

• Householder or installer submits Building Notice to local authority Building Control
• Building Control inspector visits during/after install
• Council issues a Completion Certificate
• Fee £150-£350 depending on local authority
• Slower (4-12 weeks)

For 95% of stove jobs, HETAS self-cert is the route. If the installer is not HETAS registered, the customer must take the Building Notice route — and many will refuse to pay non-HETAS installers because the certificate carries less weight for house sale and insurance purposes.

CO Alarm — Legally Required

Building Regulations Part J 2010 requires a CO alarm meeting BS EN 50291-1 to be installed in the same room as any new or replacement solid fuel, gas or oil appliance (with sealed combustion gas appliances exempted).

Position:

• Same room as the appliance
• 1-3m horizontal distance from the appliance
• 150mm below ceiling or at high level on wall
• Not directly above appliance, not behind curtains, not in dead air pockets

Cost £20-£45 supplied. Always include in the quote; never assume "the customer has one."

Common Pricing Mistakes

• No HETAS notification cost — small but must be included
• 316 liner instead of 904 — looks cheaper, fails within 5 years, recall liability
• No scaffold cost — sweep and liner top-fit needs roof access; chimney pots above eaves height almost always need scaffolding
• Forgetting register plate — required between stove flue and chimney; £45-£90
• No CO alarm — legally required; £25 cost
• Underestimating twin-wall flue — every metre, every elbow, every brace adds £85-£220
• No air supply allowance — fitting a 100mm vent grille is 1-2 hours but often forgotten
• No second chimney sweep — most installers recommend a sweep within 12 months post-install; quote as included or as a separate aftercare item

Frequently Asked Questions

Do I need planning permission for a log burner?

In most cases, no — installing a log burner inside an existing chimney is permitted development. Planning permission may be needed if you're installing a new external twin-wall flue on a listed building, in a conservation area, or if the flue exceeds the height limits in The Town and Country Planning (General Permitted Development) (England) Order 2015. Always check with the local planning authority for listed buildings or conservation areas.

Can I install a log burner myself?

You can — but the work must be notified to Building Control under Building Notice, inspected, and a Completion Certificate issued before commissioning. The Gas Safe register equivalent for solid fuel is HETAS. Without HETAS or Building Control sign-off, the installation is unauthorised, the house insurance is likely invalid, and the property cannot be sold as legally compliant. The "DIY" route adds £150-£350 of Building Control fees and weeks of delay; not a saving.

How long does a log burner installation take?

A replacement stove with the existing liner retained is 0.5-1 day. A new stove with liner installed in an existing chimney is 1-2 days. A new stove with twin-wall flue is 2-3 days. A full chamber build (knocking out a fireplace recess, building up brick, fitting a beam over) adds 2-4 days of builder time.

What is the lifetime of a 904 stainless steel liner?

Manufacturer warranties run 15-25 years for 904-grade liners burning seasoned hardwood. Burning wet wood, treated timber, or household waste reduces lifetime to 3-7 years. Customers must commit to burning kiln-dried or properly seasoned wood (<20% moisture content) for the warranty to hold.

Do I need a chimney sweep before installation?

Yes. The chimney must be swept and smoke-tested (BS 6461 / BS EN 1443) before installing a liner or commissioning a new stove. Failing to sweep before install can drop debris onto the new register plate and cause downdraft on commissioning. A second sweep within 12 months is standard practice and HETAS recommend annual sweeping thereafter.

What kind of wood can I burn?

In all of England from 1 May 2021, only "Ready to Burn" certified wood (under 20% moisture content) can be sold in volumes under 2m³, under the Air Quality (Domestic Solid Fuels Standards) (England) Regulations 2020. Customers buying logs in bulk (over 2m³) can buy unseasoned but must season properly themselves before burning. Wet wood causes more particulates, lower efficiency and tar/creosote buildup.

Regulations & Standards

• Building Regulations 2010 — Part J (Combustion appliances and fuel storage systems) — hearth, flue, ventilation, CO alarm

• Building Regulations 2010 — Part L (Conservation of fuel and power) — stove efficiency

• Clean Air Act 1993 — Smoke Control Areas, authorised fuels, exempt appliances

• Clean Air Strategy 2019 — basis for Ecodesign 2022 emissions limits

• Air Quality (Domestic Solid Fuels Standards) (England) Regulations 2020 — wet wood ban, smokeless coal restrictions

• The Ecodesign for Energy-related Products and Energy Information Regulations 2021

• BS 8303-1:1994 — Installation of domestic heating and cooking appliances burning solid mineral fuels

• BS EN 15287-1:2007+A1:2010 — Chimneys design, installation and commissioning

• BS EN 1443:2003 — Chimneys general requirements

• BS EN 50291-1:2018 — Carbon monoxide alarms specification

• BS 6461 — Installation of chimneys and flues for solid fuel

• HETAS Competent Person Scheme — self-certification under Part J

• Approved Document J — combustion appliances

• HETAS — Heating Equipment Testing and Approval Scheme — installer registration, exempt appliances

• DEFRA Smoke Control Areas map — check whether site is in SCA

• Clean Air Strategy 2019 — government policy basis

• Solid Fuel Association — trade body

• BSI — BS EN 50291 — CO alarm standard

• boiler installation pricing guide — gas heating alternative

• scaffolding pricing guide — scaffold for chimney access

• external render pricing guide — exterior work that may interact with flue routing

• asbestos removal pricing guide — older chimneys may contain asbestos in flue gaskets