Log Burner in a Conservatory — UK 2026 Cost Guide
Yes, you can install a log burner in a UK conservatory. Total installed cost in 2026: £3,600–£5,800. The critical variables are the roof material, flue route and clearances from the main building and openings.
The short answer
UK 2026 typical conservatory log burner install: £3,600–£5,800 total. That’s £800–£2,000 over a standard install with an existing chimney — driven by the twin-wall flue requirement (conservatories don’t have chimneys) and the specialist roof-penetration flashing kit needed for UPVC, polycarbonate, or glass.
Get your conservatory install estimate
Pick “Conservatory” on step 5 of the calculator. The scenario multiplier accounts for the roof penetration and flue requirements.
Open the calculatorRoof penetration — the main cost variable
Conservatory roofs come in three main materials, each needing different flashing kits and routine:
- Polycarbonate panel roof: a heat-resistant flashing collar (£150–£250) prevents the plastic deforming. Routine UK install.
- UPVC frame + polycarbonate / glass roof: similar flashing approach with extra care around the UPVC framework. £200–£350.
- Glass roof: requires a specialist conservatory roofer to cut and seal the glass — adds £300–£600 over a standard polycarbonate penetration.
- Solid tile or slate roof: penetrate as you would a standard pitched roof. Cheapest option.
The 2.3m outlet-clearance checks
England’s Approved Document J Diagram 17 uses several separate measurements. An outlet within 2.3m horizontally of an openable rooflight, dormer or other opening should be at least 1m above the top of that opening. An outlet within 2.3m of an adjacent building should be at least 600mm above every part of that building within the distance. The outlet must also clear its own roof correctly.
An attached conservatory often needs a taller route, but there is no blanket instruction to extend 1m above the main roof. Have the actual elevations measured. Wales publishes a separate Approved Document J, while Scotland and Northern Ireland use different national guidance.
Ventilation and air supply
Modern UPVC conservatories can be relatively airtight, so the applicable national combustion-air rules and appliance instructions need to be checked:
- For stoves above 5kW, a permanent dedicated air vent is required regardless of room volume
- For airtight conservatories (air permeability ≤5 m³/h.m²), a vent or direct external air supply is often required even under 5kW
- Room-sealed (external air) stoves are a clean solution — they don’t draw air from the room. Typically £200–£600 more than equivalent conventional stoves
Hearth and fire-rated boundaries
English and Welsh Approved Document J guidance commonly uses a minimum 840×840mm freestanding hearth, with thickness depending on the appliance’s tested hearth temperature. If the conservatory floor is timber rather than a solid slab, the hearth and supporting construction need a site-specific design. Scotland and Northern Ireland use their own standards.
If the stove is sited against the party wall between conservatory and house, that wall may need fire-rated treatment — particularly if combustible material is within clearance distances.
Recommended conservatory stoves
Right-sizing matters in conservatories. They’ve got no thermal mass, so a 5kW stove quickly overheats. For most UK conservatories under 20m², a 3–4kW stove is the right call.
- Salamander Hobbit (~£449, 3.5kW) — designed for compact spaces.
- Charnwood Aire 3 (£1,395, 3.6kW, clearSkies Level 5) — premium 3kW option. Charnwood guide →
- Aarrow Hamlet Solution 4 (£695, 4.5kW multifuel) — budget entry. Aarrow guide →
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Find an installerFrequently asked questions
Can I install a log burner in a conservatory?
Potentially, subject to the applicable building and planning rules. England and Wales use their separate Approved Documents J, while Scotland and Northern Ireland use different guidance. A twin-wall flue is usually required because conservatories rarely have a masonry chimney; confirm the route before purchase.
What’s the cost of a conservatory log burner install?
This guide's indicative UK 2026 range is £3,600–£5,800. The largest variables are the roof construction, compatible flashing, the route and the outlet's measured clearances from its own roof, nearby openings and any adjacent building.
Can the flue go through a polycarbonate or glass roof?
Yes, with the right flashing kit. UPVC and polycarbonate need a heat-resistant flashing collar (£150–£350) to ensure the plastic doesn’t melt or crack near the hot flue. Glass roofs need a specialist conservatory roofer to cut and seal. Specialist installers handle this routinely.
Will the conservatory be too hot in summer?
Only if oversized. Conservatories have no thermal mass, so a 5kW stove can quickly overwhelm. For most UK conservatories under 20m² floor area, a 3–4kW stove is the right call. The Salamander Hobbit (3.5kW) and Charnwood Aire 3 (3.6kW) are well-matched.
Do I need an air vent in a conservatory?
Often. The installer must calculate ventilation from appliance output and building air permeability under the applicable national guidance. English and Welsh Part J, Scotland’s Technical Handbook and Northern Irish Technical Booklet L use different provisions, so the 5kW shorthand should not be treated as a UK-wide rule.