Plenty of homeowners across England and Wales hit a wall with their Boiler Upgrade Scheme application, not because they did something wildly wrong, but because of small, fixable problems that slipped through the cracks.
Six issues come up time and time again. Spot them early, and your chances of a smooth application improve dramatically.
Is Your EPC the Problem?
Your Energy Performance Certificate carries more weight than most people expect. If it’s expired, EPCs last 10 years, or flags unfinished loft or cavity wall insulation work, your application won’t go anywhere.
Check your EPC on the government property register before you get quotes. Insulation recommendations aren’t optional hints; they’re a hard blocker. Sort them out early, or you’ll be waiting weeks longer than planned.
Does Your Home Actually Qualify?
A few property types catch people off guard. The scheme covers England and Wales only, not Scotland. You need to own the property or have written permission from your landlord. Leasehold flats often require freeholder approval too, which tends to surface at the worst possible moment.
If you’re unsure whether your home qualifies, it’s worth checking before you Apply for Boiler Upgrade Scheme, eligibility is confirmed at the start of the process, not after the work is done.
Worth noting: switching to a more efficient gas boiler doesn’t qualify. The scheme backs heat pumps and, in limited off-grid situations, biomass boilers. That’s it.
Has Your Installer Got Current MCS Certification?
Your installer handles the grant paperwork on your behalf. If their MCS certification has lapsed, or they’ve never held it, the UK government won’t process the submission, full stop.
Before agreeing to anything, check the MCS directory yourself. While you’re at it, ask how many Boiler Upgrade Scheme applications they’ve submitted. Experience cuts down on paperwork mistakes, and mistakes are a common cause of delays.
Did Another Grant Already Cover This System?
The scheme won’t pay twice for the same work. If you received separate public funding toward the same heating installation, through ECO, for example, or another government energy program, your application gets knocked back.
Many people don’t realise their previous support counts as overlap. Be upfront with your installer about any prior grants so they can flag any conflicts before submitting.
Did the 120-Day Window Catch You Out?
Your system must be fully commissioned within 120 days of the application being made. That window sounds generous until a delivery delay or a busy installer schedule eats into it.
Don’t assume the process will run smoothly. Build a buffer, stay in regular contact with your installer as the deadline approaches, and don’t book the job for the last possible week.
Did You Confirm Your Consent in Time?
The UK government contacts homeowners directly to confirm they’ve agreed to the application. If that confirmation doesn’t come back within the set timeframe, the application is automatically cancelled.
Keep an eye on your inbox, including your spam folder, after your installer submits the form. It’s one of the most avoidable reasons an application fails, and it has nothing to do with the quality of your home or your chosen system.
What Happens After a Rejection?
Getting turned down isn’t the end of it. The UK government gives a reason for the rejection, and most issues, an outdated EPC, missing insulation sign-off, a paperwork error, can be fixed and resubmitted.
Sit down with your installer and go through the rejection reason carefully. In most cases, you’ll be back on track within a few weeks. If you feel your installer mishandled things, you’re free to work with a different MCS-certified professional next time.
If you’re still weighing your options, it helps to get the full picture first. The Boiler Upgrade Scheme covers more than most people expect, so reading up before you commit can save you a lot of back-and-forth later.
Frequently Asked Questions
How long does fixing a rejected application usually take?
Small errors and EPC renewals often resolve within a couple of weeks. Insulation upgrades can add more time depending on contractor availability.
Will I lose the grant if my application is rejected?
No. Nothing is paid out until approval comes through and the work is done. A rejection simply means the process starts again once the issue is corrected.
Can I use a different installer after a rejection?
Yes. You can choose any MCS-certified installer to handle your resubmission, you’re not locked in.
Does one rejected application affect future ones?
Not at all. There’s no penalty or mark against your record. Once the problem is fixed, you apply again as normal.
