Step-by-step UK timeline
Week 1–2: Survey + written quote. MCS-certified installer visits or uses remote-survey method.
Week 2–4: Heat pump unit ordered + 2–4 weeks delivery time from manufacturer.
Week 3–5: BUS grant application submitted by installer. Ofgem decision 1–2 weeks.
Week 5–9: Install scheduled + completed. 2–5 days on site.
Week 8–10: Commissioning + MCS certificate issued + installer warranty + tariff guidance.
Variations by property type
Flat (1–2 bed): 1–2 days physical install. Total enquiry-to-completion: 4–7 weeks.
Terraced 2–3 bed: 2–3 days install. Total: 5–9 weeks.
Semi-detached 3-bed: 2–3 days install. Total: 5–9 weeks (UK median).
Detached 4-bed: 4–7 days install. Total: 7–12 weeks.
Listed building (any size): 5–7 days install + planning approval. Total: 12–20 weeks.
What can extend the timeline
Listed-building consent: +8–14 weeks (12–18 weeks for Grade I).
Conservation-area planning consent: +6–10 weeks.
Tenement co-proprietor consent (Scotland): +4–8 weeks.
Manufacturer parts shortage: +2–4 weeks (rare in 2026 but does happen).
Highland / remote rural installer scheduling: +2–3 weeks vs urban.
Custom radiator orders (period properties needing colour-matched panels): +3–4 weeks.
FAQ
Can I install a heat pump in winter?
Yes. UK heat pump installations happen year-round. Winter installations are common for emergency boiler replacements. Installer schedules are typically tightest October–February (boiler-replacement season), so quote prices may be ~5% higher.
How long is the quote good for?
Typical UK quote validity is 30–90 days depending on installer. After this, the quote may be revised based on parts price changes or scheme amount changes (e.g. if BUS grant amount changes during the validity window).
Can I expedite the process?
Some installers offer 'fast-track' install windows for urgent boiler-failure cases, sometimes completing in 3–4 weeks total enquiry-to-completion. Costs ~5–10% more. Cannot bypass the BUS grant Ofgem approval (1–2 weeks minimum).
What happens if I lose heat during install?
Most installers complete the changeover in 2–3 days for typical UK semis. Some leave the existing boiler operational until day 2 of install. For longer installs (5+ days), some installers provide temporary electric heaters.
Sources
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