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 and the 2.3m proximity rule.
The short answer
UK 2026 typical conservatory log burner install: £3,600–£5,800total. 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.
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Pick "Conservatory" on step 5 of the calculator. The scenario multiplier accounts for the roof penetration and flue requirements.
Open the calculator →Roof 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 proximity rule
If your conservatory is attached to or close to the main house (within 2.3 metres of any habitable window), the flue must extend at least 1 metre above the highest part of the main house roof — not just the conservatory roof. On a two-storey house this can require 4–6 metres of additional twin-wall pipe at £60–£120/m, raising the flue element by £1,000–£2,000.
For most UK conservatories which adjoin the main house, this applies — budget toward the upper end of the £3,600–£5,800 range.
Ventilation and air supply
Modern UPVC conservatories are typically highly airtight, which triggers ventilation requirements under Building Regulations Part J:
- 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) stovesare a clean solution — they don't draw air from the room. Typically £200–£600 more than equivalent conventional stoves
Hearth and fire-rated boundaries
Standard Approved Document J hearth rules apply: minimum 840×840mm freestanding, 12mm thickness if the stove is certified to keep its base under 100°C (otherwise 125mm constructional). If the conservatory floor is timber rather than solid slab, a constructional hearth or local reinforcement is usually needed.
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 installer →Frequently asked questions
Can I install a log burner in a conservatory?
Yes — provided the conservatory complies with Approved Document J and BS8303:2018. No planning permission needed unless the property is listed. A twin-wall flue is essentially always required since conservatories don't have masonry chimneys. UK 2026 typical cost: £3,600–£5,800.
What's the cost of a conservatory log burner install?
UK 2026: £3,600–£5,800 total installed for a typical conservatory setup. The biggest variables are the conservatory roof type (UPVC vs polycarbonate vs glass needs different flashing kits, £150–£350 extra), and whether you're sited far enough from the main house to avoid the 2.3m proximity rule.
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?
Yes, for stoves above 5kW or in airtight conservatories of any output. Modern UPVC conservatories are typically airtight enough that a permanent air vent is required regardless of kW. A room-sealed (external air supply) stove is an alternative — adds £200–£600.