VAT on conversions and professional fees in a budget

VAT on a conversion project changes the real cost of identical building work by a fifth, and it is settled by what the building was before you started rather than by what you are doing to it. Converting a barn or an office into homes is usually a 5 per cent job. Renovating a house that has stood empty long enough is also 5 per cent. Extending the house you already live in is 20 per cent. And the professional fees for all three are 20 per cent whatever the building work rate, which is the point most self-build budgets get wrong. Treat VAT as a line in the appraisal from day one, because the rate is fixed by facts you can evidence rather than by how the contract is written.

Why the rate moves with the building, not the works

HMRC's rules for construction run on the status of the property. A qualifying new dwelling, a conversion that changes the number of dwellings, a conversion from non-residential use, and a long-term empty home each sit in a different place, and identical plasterwork is charged differently in each.

That has two practical consequences. A contractor who charges 20 per cent on work that qualifies for 5 per cent has overcharged you, and the route to fixing it is a credit note rather than a claim to HMRC. And a project that would qualify can lose the relief through sequencing, for example by bringing a long-empty house back into use briefly before the main works start.

Establish the status in writing before the contract is signed. Afterwards is a negotiation.

The reduced rate for qualifying conversions

The 5 per cent reduced rate covers two broad situations.

A changed number of dwellings conversion, where the number of self-contained dwellings afterwards differs from the number before. A house becoming three flats qualifies. Three flats becoming one house qualifies. A house becoming a bigger house does not, because the count has not changed.

A non-residential conversion, where a building that was not previously residential becomes one or more dwellings. Offices, barns, chapels and shops all fall here, provided the building really was non-residential and not simply unused housing.

The relief covers the contractor's services and the materials they supply with those services. It does not cover materials you buy yourself and hand to a contractor, which is a common and expensive mistake on a self-managed job.

For a developer-free self-build conversion, the DIY housebuilders scheme allows the VAT to be reclaimed, subject to the scheme's own rules and its time limit for claiming after completion. That time limit has been extended in recent years, so take the current period from the scheme guidance rather than from an older account of it.

Long term empty dwellings

A dwelling that has not been lived in for two years or more immediately before the work starts can qualify for the 5 per cent reduced rate on renovation. Longer vacancy periods can open further relief under the DIY scheme.

The evidence is where these claims fail. HMRC expects documentary proof of the vacancy period, and the strongest single document is a letter from the local authority's council tax or empty property team confirming the dates the property was recorded as empty. Build that into the programme early, because councils take weeks to produce it.

Other supporting evidence helps: electoral roll checks, utility records showing no consumption, dated photographs, and the vendor's own statements. A declaration from the seller on its own is weak.

One trap. If anyone occupies the property during the two years, even briefly, the clock resets. Resist the temptation to let a builder stay on site in the house.

Zero rating on a qualifying new build

Construction of a new dwelling is zero-rated, which means the contractor charges no VAT on their services or on materials supplied with them. A self-builder who engages trades directly can reclaim the VAT on materials through the DIY housebuilders scheme.

Qualifying is narrower than it sounds. The dwelling must be self-contained, there must be no prohibition on separate disposal or separate use in the planning permission, and the works must be a genuine new build rather than a rebuild retaining part of the existing structure. A permission condition tying an annexe to the main house will usually block zero rating, which is why the wording of that condition is worth negotiating at the decision stage rather than accepting as standard.

Certain items are blocked from recovery whatever the rate: most fitted furniture, white goods, carpets and some electrical appliances. Budget those at 20 per cent and do not argue with the list.

Why professional fees are treated differently

Architects, structural engineers, planning consultants, surveyors and project managers supply professional services, and professional services are standard-rated at 20 per cent regardless of the rate applying to the construction work. The DIY housebuilders scheme does not allow recovery of VAT on them either.

On a conversion with a meaningful design team, that gap is real money. Twenty per cent on fees against five per cent on the build is a cost nobody shows you until the invoices arrive.

There is one well-established route around it. Where the design team is engaged by the contractor under a design and build arrangement, with consultants novated into the contractor's appointment, their work can form part of the contractor's single supply of construction services and take the rate of that supply. It has to be a real commercial arrangement rather than a label, and the contract has to be drafted accordingly, so take professional advice before restructuring an appointment for this reason alone.

Keep the fee line visible in the cash flow. Alongside it sit the planning application fee, which the piece on building control charges alongside the planning fee covers, and any levy liability, which is addressed in the levy and residential extensions over the threshold.

Listed buildings and the repairs position

The zero rate that once applied to approved alterations of protected listed dwellings was withdrawn in October 2012. Alterations and repairs to listed dwellings are now standard-rated in the ordinary way.

Where a listed building has been empty for the qualifying period, or where the work is a genuine conversion changing the number of dwellings, the usual conversion reliefs still apply. Listing neither grants nor removes relief on its own. Owners of listed buildings are frequently told otherwise, and the position has been settled for over a decade.

Getting the position confirmed before contracts are signed

Three practical steps, in order.

First, write down the factual basis: what the building was last used as, when it was last occupied, how many dwellings existed before and how many will exist after. Second, gather the evidence for each of those facts, particularly the local authority letter where vacancy matters. Third, take advice from an accountant or VAT specialist and, where the position is finely balanced, consider asking HMRC for a written ruling on the specific facts.

Then put the agreed rate into the building contract expressly, with the evidence attached, so the contractor is not left guessing. And set the budget out properly, with construction at the agreed rate, fees at 20 per cent, blocked items at 20 per cent and the application fees alongside, as discussed on PlanScope pricing.

This is general guidance on tax and planning, not legal or tax advice; check the position with HMRC, a qualified accountant or your local planning authority before relying on it.

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