How listing affects costs
Conservation area only (not listed): +5–15% above UK average → £11,800–£13,500 typical.
Grade II / Category C / Grade B2: +15–25% → £12,800–£14,500 typical.
Grade II* / Category B / Grade B1: +25–40% → £14,000–£16,500 typical.
Grade I / Category A / Grade A: +40–55% → £15,500–£17,500 typical.
Cost premium drivers: heritage-spec materials (galvanised steel where visible vs plastic), scaffolding, listed-building consent fee (£200–£500), longer install timelines (5–7 days vs 2–3 standard).
Listed-building consent process
1. Pre-application consultation with the conservation officer (free, 1–3 weeks). Strongly recommended — produces written officer opinion that you can attach to formal submission.
2. Formal listed-building consent application (£200–£500 council fee). Submitted with architectural plans, acoustic statement, heritage-impact assessment.
3. 8–12 week formal decision period (longer for Grade I).
4. Architectural amendments if requested (1–2 weeks).
5. Approval with conditions (typical: rear-only siting, colour-matched casing, no visible facade pipework, screening, reversible installation).
What conservation officers require
Outdoor unit on rear or side wall (not facing the street).
Unit colour matched to building stonework/brickwork (specify RAL colour reference).
No visible pipework on public-facing facade — concealed runs through interior walls or service voids.
Screening (timber slats, hedge, planting) where unit is visible from public viewpoint.
Acoustic statement showing operation below 35 dB at neighbouring properties (stricter than standard 42 dB).
Heritage-spec materials (galvanised pipework, traditional flashing materials where visible).
Reversible installation: future removal must not damage original fabric.
FAQ
How can I maximise approval likelihood?
Use an installer with documented listed-building track record. Engage a heritage architect or conservation consultant for the application (£500–£1,500 — raises approval rate from 75–80% to 95%+). Pre-application consultation with the conservation officer is essential. Specify R290 refrigerant (lowest GWP) and reversible installation methods.
Where in the UK is listed-building density highest?
Bath (UNESCO World Heritage Site, 70%+ of central buildings listed), central Edinburgh New Town and Old Town, central York within the Bar Walls, central Cambridge, central Oxford, central London (Westminster, Mayfair, parts of Kensington), and most picture-postcard market towns.
Does the BUS grant apply to listed buildings?
Yes. The £7,500 BUS grant applies regardless of listing status as long as you meet standard eligibility (homeowner-occupier, replacing fossil-fuel system, valid EPC). Listed status doesn't affect grant eligibility — only the planning timeline and install costs.
Can I get a heat pump in a Bath Georgian terrace?
Yes, but expect £12,500–£15,500 cost (UNESCO + listed-building premium) and 12–14 week approval timeline. Bath & North East Somerset Council's Conservation Team requires pre-application consultation for nearly all heat-pump installations in central Bath.
Sources
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