Heat Pump Grant Timeline: How Long Does It Take?
The Ofgem approval itself takes 2-4 weeks — but the full process from first enquiry to a working heat pump is typically 8-16 weeks. Planning ahead is key. If you want your heat pump before winter, start by May or June.
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Full Timeline Breakdown
| Stage | Duration | What Happens |
|---|---|---|
| Get quotes and surveys | 2-4 weeks | Contact installers, property surveys, compare quotes |
| Choose installer, sign contract | 1 week | Select your preferred installer, sign agreement |
| BUS application submitted | 1-2 days | Installer submits to Ofgem portal |
| Ofgem approval | 2-4 weeks | Application reviewed, voucher issued |
| Wait for installation date | 2-8 weeks | Depends on installer diary |
| Installation | 1-3 days | Old boiler removed, heat pump installed |
| Grant payment | 1-2 weeks | Ofgem pays installer, you pay balance |
Total: 8-16 weeks. Summer installations tend to be faster due to better availability.
How to Speed Up the Process
- Get your EPC sorted in advance
- Choose an experienced installer with a strong BUS track record
- Respond quickly to document requests and sign promptly
- Start in spring or early summer for the widest installer availability
- Get multiple quotes simultaneously rather than sequentially
Common Causes of Delays
EPC insulation recommendations not yet addressed, missing or expired EPC, slow document provision, and busy installer schedules (especially autumn/winter). See our application guide for tips on avoiding delays.
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Frequently Asked Questions
How long does the BUS grant take?
Ofgem approval: 2-4 weeks. Full process: 8-16 weeks.
Can I speed it up?
Yes — have your EPC ready, respond quickly, and choose an experienced installer.
When should I start?
May or June if you want a heat pump before winter.
About the BUS Grant Timeline
The Boiler Upgrade Scheme timeline is one of the most common concerns for homeowners considering a heat pump. The application process is managed by your MCS-certified installer through Ofgem, with approval typically taking 2-4 weeks. The full process from first enquiry to working heat pump takes 8-16 weeks. This compares favourably to the defunct Green Homes Grant, which often took months with no resolution. Homeowners also considering solar panels can often coordinate both installations for maximum efficiency.