The HBF wants council tax tied to a completion certificate, not a guess. Developers should be asking the same question about their own records.
A new HBF report finds 45% of councils charge full council tax on unsold new homes once deemed 'substantially complete'. The fix it proposes turns on documentary proof of completion.
The Home Builders Federation has published a report arguing that council tax is being levied on new build homes before they are fit to live in, because local authorities have no consistent definition of when a property counts as "complete". The report, Licence to Bill, was produced in partnership with Paragon Development Finance and calls for that definition to be tied to a single document: the building control completion certificate.
What happened
According to the HBF's findings, 45% of local authorities charge developers full council tax on newly built homes that are awaiting sale or occupation, often from the point a property is judged "substantially complete" rather than from when it is genuinely ready to live in. The report says that test can be met even where a home lacks connected utilities, fixtures or fittings, leaving developers liable for tax bills on stock they cannot yet sell or occupy.
The HBF reports that 88% of SME housebuilders say these charges are affecting cash flow, and that council tax appeals relating to Completion Notices have risen sharply over the past two years as developers contest individual local authority decisions. HBF chief executive Neil Jefferson said the charges place "further pressure on cash flow" and can "make the difference between a site being viable or not", adding that unsold, unoccupied new homes "do not place any meaningful burden on local council tax services".
The report's central recommendation is a national framework under which a property is only judged substantially complete once a building control completion certificate has been issued, replacing the current patchwork of local authority interpretation. It also calls for a reinstated, time-limited Class C exemption for newly built homes that are unoccupied and substantially unfurnished, and for new builds to be excluded from the Empty Homes Premium and Second Homes Premium for two years from completion.
Why it matters for developers
The report's argument turns on a question that should be familiar to anyone running handover on a live site: what counts as evidence that a home is actually finished. Local authorities currently fill that gap with their own judgement calls because, in the HBF's account, there is no single authoritative record they can point to. The HBF's proposed fix is not a change to construction standards; it is a change to what counts as proof.
That has a direct read-across for developers managing their own internal sign-off. If a building control completion certificate becomes the recognised marker of completion for tax purposes, the developments most exposed to disputes and appeals will be the ones where that certificate, and the supporting documentation behind it, is hardest to locate or evidence on demand. For SME builders already citing cash flow pressure from these charges, an inconsistent or slow-to-produce paper trail compounds a problem that is already squeezing margins.
The same gap shows up downstream at handover. A homeowner, housing association or managing agent asking "is this property actually finished" is asking a version of the same question a council tax officer is asking when assessing a Completion Notice. Where the answer depends on a single certificate buried in a site folder rather than a structured, retrievable record, both processes are slower and more contested than they need to be.
What to watch
The HBF's recommendations are a lobbying position, not a confirmed policy change, and there is no published government timetable for a response. Developers operating in local authorities with a track record of charging full council tax on unsold stock should expect the current inconsistency to continue in the near term, and should watch for any government engagement with the report's call for a national framework. The volume of council tax appeals tied to Completion Notices is itself worth tracking as a proxy for how widespread the dispute has become.
How Guided Home helps
The HBF's proposed fix depends on a developer being able to produce one document, on demand, for any given plot. Guided Home's Document Assurance module validates and stores completion documentation, including building control sign-off, against a structured record for every unit, so that proof of completion is retrievable in minutes rather than reconstructed from a site folder when a council tax dispute or a homeowner query arrives.
Sources
- City A.M. — "'Manifestly unfair' council tax raid on developers thwarts new starts" (28 May 2026)
- Building — "HBF says 'inconsistent' application of council tax on unfinished new builds is thwarting SME builders"
- Housing Today — "HBF says 'inconsistent' application of council tax on unfinished new builds is thwarting SME builders"
- Today's Conveyancer — "Council tax charges on unfinished homes is driving down housing development, HBF warns"
- RS Bonds Surety — "Council tax on unoccupied, unfurnished, and unsold homes putting housing development at risk, new report finds"
- Home Builders Federation — hbf.co.uk