The Department for Energy Security and Net Zero published the summary business case for extending the Boiler Upgrade Scheme to 2029/30 on 8 May 20261. The document applies to England and Wales1.
The publication is a transparency document rather than an announcement of new grant terms. It sets out the case for investment in continuing the scheme beyond its current period1. The summary business case runs to 22 pages and is available as a PDF of 339 KB1.
The department said the release follows a requirement placed on major projects:
"From 11 June 2025, all projects and programmes on the Government Major Projects Portfolio ( GMPP ) are required to publish a summary business case, Full Business Case ( FBC ), or Programme Business Case within four months of receiving HM Treasury approval."
The department said the requirement exists "to provide greater transparency on how HMG business cases are developed and how decisions are made"1. The publication sits within a wider collection of DESNZ major projects business case publications1.
The summary business case does not, on the page published, set out grant amounts, eligibility rules or application process changes. Those remain as set out elsewhere. Households wanting to check whether their home and heating system qualify can read the guidance on Boiler Upgrade Scheme eligibility, including the position for homes that already have a gas boiler Can I get the Boiler Upgrade Scheme grant if I have a gas boiler? and the treatment of lofts where an EPC recommends insulation Can I get a Boiler Upgrade Scheme grant if my EPC recommends loft insulation?. The current grant amount is set out separately How much is the Boiler Upgrade Scheme grant?, as are the requirements for biomass systems Boiler Upgrade Scheme requirements for biomass boilers and the rules for landlords and second homes Can landlords and second home owners get the Boiler Upgrade Scheme?.
Why it matters for households
The Boiler Upgrade Scheme is one of the main routes by which a household in England and Wales can reduce its reliance on a gas boiler for heating. Extending it to 2029/30 would mean the grant remains available for a further period, which matters to any household weighing up whether to replace a fossil fuel heating system with a heat pump or, in qualifying cases, a biomass boiler.
The practical effect of this publication is limited in the short term. It confirms that the department has prepared and published the investment case for the extension, and that the extension is being taken through the formal business case process. It does not, on the published page, confirm new funding levels, revised grant amounts or changed eligibility criteria. Households considering an installation should treat the existing published rules as the ones that apply until any change is formally announced.
For a home's energy independence, the significance is continuity. A scheme with a confirmed horizon gives households and installers a longer planning window than one subject to annual uncertainty. How far that translates into installations depends on the funding envelope and the rules, neither of which is set out in the summary business case page.
What happens next
The summary business case has been published, meeting the four month requirement described by the department1. No further dated steps are given on the published page. The document itself, at 22 pages, may contain more detail than the landing page, but no further timetable has been reported.