Heat Pump Installation Timeline UK 2026

Weeks 1-2: Initial enquiry + installer selection

• Research MCS-certified installers (mcscertified.com find-an-installer).
• Request 3 quotes - typical 2-5 day response time per installer.
• Initial site visits (in-person or video) - 30-60 min each.
• Compare quotes on cost, SCOP, materials, install premium.

Weeks 2-4: Heat-loss calculation + detailed quote

• Selected installer's detailed heat-loss survey (1-2 hours on-site).
• Heat-loss calc completed within 5-10 days.
• Detailed quote with unit selection, capacity, radiator upgrades, install scope.
• BUS grant application initiated by installer.

Weeks 4-6: Contract signed + unit ordering

• Contract signed; typical 15-25% deposit paid (avoid >30% per our installer questions guide).
• Heat pump unit ordered - 2-4 week typical UK lead time for popular models.
• BUS application processed; conditional approval issued.
• Schedule confirmed for install dates.

Weeks 6-8: Install execution

• Day 1: outdoor unit pad install + electrical isolator + condensate drainage.
• Day 2: indoor cylinder install + primary pipework.
• Day 3-4: refrigerant pipework + radiator upgrades + electrical commissioning.
• Day 5: controller commissioning + WC curve + first-time fire-up.
• Day 6: customer handover + manufacturer app setup + warranty registration.

Weeks 8-10: Post-install verification + BUS grant

• MCS install certificate issued by installer.
• BUS grant application finalised; payment within 28 days typical.
• First-month monitoring + bill verification.

Total: 8-10 weeks for straightforward UK 3-bed retrofit.

1. Planning permission required: conservation area, listed building, principal-elevation front siting. Adds 8-16 weeks (planning processing + LBC if applicable).
2. DNO supply upgrade needed: 60A to 100A. Adds 4-8 weeks (some major works require 4-6 month lead time).
3. Envelope upgrades sequenced first: cavity wall, glazing, insulation. Adds 4-12 weeks depending on scope.
4. Listed Building Consent: required for all listed grades. 12-26 weeks consent process.
5. Heat pump unit lead time: popular models (Vaillant aroTHERM Plus, Octopus Cosy 6) 2-4 weeks; specialist variants (coastal, low-noise) 4-8 weeks.
6. Renovation bundling: heat pump install timed with kitchen/bathroom/extension work. Adds 4-8 weeks to align trades.

Maximum timeline scenarios:

• Listed property + envelope upgrades + DNO upgrade: 24-32 weeks (6-8 months).
• Off-grid build + solar PV + battery + heat pump: 16-24 weeks.
• Full home renovation + heat pump: 20-32 weeks total project.

Strategy 1: target spring/summer install (April-August)

• Standard install runs in mild weather - no heating disruption.
• Installers less busy than autumn rush; quicker scheduling.
• 3 months post-commissioning to settle in before first winter test.
• Best for households planning the install proactively.

Strategy 2: target autumn install (September-November)

• Heat pump operational for winter heating season immediately.
• Lead times longer (3-5 weeks) due to autumn rush.
• Limited time to tune WC curve before peak cold demand.
• Best for households needing heating before winter.

Strategy 3: emergency replacement (boiler failure)

• Existing boiler failed; need heating ASAP.
• Compressed timeline: 4-6 weeks possible if standard property + installer availability.
• BUS grant still available but tighter coordination required.
• Last resort - other strategies preferred for planning.

Most UK households should plan for Strategy 1 (spring/summer) - provides best installer choice + commissioning time before winter test.

1. Insulation upgrades if not already done - cavity wall, loft top-up, floor insulation. Can run in parallel with planning + lead times.
2. Window upgrades if still single-glazed or 1980s aluminum. Major project but pays back via reduced heat pump sizing.
3. Energy supplier research - prepare to switch to Octopus Cosy / Intelligent Go at commissioning.
4. Manufacturer app installation - download the right app for your selected heat pump model; create account.
5. Smart TRV research - decide on per-room control approach (Tado, Drayton Wiser, Honeywell).
6. Photograph existing system for installer reference + your records.
7. Read manufacturer manual in advance - familiarise with controller + scheduling concepts.

Heat pump install isn't complete at commissioning - first 3 months matter for tuning + verification:

• Month 1: hands-off observation. Don't adjust settings. Let property + heat pump settle. Note any anomalies but don't troubleshoot.
• Month 2: active monitoring. Daily room temperature log + weekly meter readings + manufacturer app data.
• Month 3: data-driven tuning. WC curve adjustment based on 2-month data + first installer return visit for tuning.

See our first winter expectations guide for detailed month-by-month playbook.