Conversion Clients — VAT431C & the 5% Rate — Broker Guide

Industry & Partners Mortgage BrokersConversion Clients: Barn, Office and Pub Conversions Carry a 5% VAT Rate and a VAT431C Reclaim

Conversion Clients: Barn, Office and Pub Conversions Carry a 5% VAT Rate and a VAT431C Reclaim

Clients converting a non-residential building — a barn, office, pub, shop, mill or chapel — into a home should be charged the 5% reduced rate on qualifying contractor services, not 20%. Qualifying private converters can then reclaim that 5%, plus the 20% VAT on materials they bought directly, through HMRC's VAT431C scheme. Conversion projects carry more complex VAT rules than new builds and a higher risk of contractor rate errors — which makes an early referral even more valuable.

Why this matters

On a £200,000 conversion contract, the difference between the correct 5% rate and an incorrect 20% charge is £30,000 — overpaid to the contractor, not reclaimable via VAT431C, and recoverable only through a corrected invoice. Contractors unfamiliar with conversion rules routinely default to 20%. A client who catches this while the contractor is still on site keeps that money; one who discovers it at completion often does not.

The key distinctions

Correct — 5% on qualifying conversion services

Building services carried out by a VAT-registered contractor on a qualifying non-residential-to-residential conversion should be charged at the 5% reduced rate under HMRC Notice 708. That 5% is reclaimable via VAT431C.

Overcharge — contractor services at 20%

20% on qualifying conversion services is an overcharge. The excess 15% is not reclaimable via VAT431C — the client needs a credit note and corrected invoice from the contractor, which becomes much harder after the project ends.

Reclaimable — direct materials at 20%

Materials the client buys directly from merchants are correctly charged at 20%, and that full 20% is reclaimable via VAT431C where the materials are incorporated into the building.

Eligibility — previous use and planning position matter

The building must have been non-residential before conversion (or empty 10+ years), with planning permission for the change of use. Mixed-use buildings — a pub with a landlord's flat — carry eligibility complications that need identifying early.

Practical checklist for brokers

Flag any client converting a barn, office, pub, shop, mill or other commercial building to residential use

Clients changing the number of dwellings within a property may also qualify for reduced-rate treatment

Refer before contractors are appointed where possible — rate errors are easiest to prevent at procurement stage

Mid-conversion clients can still have invoices reviewed and supplier corrections requested

The VAT431C claim must be submitted within 6 months of the completion certificate — no HMRC discretion for late claims

You are not expected to assess eligibility or rates — a referral to VATBuild is the hand-off

What VATBuild does for this client type

VATBuild asks the eligibility questions up front — building type, previous use, planning status — and maps the project to the correct HMRC scheme. It then checks every contractor invoice for the expected 5% rate, flags 20% charges as potential overcharges with a supplier correction draft ready, separates claimable from excluded items, and tracks the 6-month VAT431C deadline through to a structured claim summary.