Commercial to Residential Conversion UK 2026 — Landlord Planning & Tax Guide

Class MA permitted development — what it covers

Class MA (introduced August 2021) is the primary PD right for commercial-to-residential conversion:

• Qualifying buildings — Class E uses: Class MA applies to buildings in Use Class E — which covers commercial, business and service uses including: offices, retail shops, restaurants and cafés, financial and professional services, gyms and health centres, crèches and nurseries, and light industrial uses. Class MA replaced the previous Classes O (office to residential) and PA (light industrial to residential) rights
• Maximum floorspace: There is no upper limit on the floorspace of buildings that can be converted under Class MA (the previous Class O had limits). Any size of Class E building can in principle be converted, subject to the prior approval criteria
• Vacancy requirement: The building must have been vacant for at least 3 months before the prior approval application is submitted. The 3-month vacancy period must be immediately before the application — so a building that was occupied 2 months before application would not qualify
• Buildings that cannot be converted under Class MA: The right does not apply to: listed buildings; buildings in a Site of Special Scientific Interest (SSSI); buildings in a safety hazard area; buildings in a military explosives storage area; buildings in an area of outstanding natural beauty (AONB) or national park (these are excluded from the right); and buildings that have already been converted from residential use using another PD right since 1 January 2018
• Flats and upper floors: Where the Class E building includes upper floors already in residential use, those floors do not form part of the PD right — only the commercial floorspace can be converted. Mixed-use buildings can convert the commercial element to residential under Class MA

Prior approval — the mandatory process

All Class MA conversions require prior approval from the local planning authority:

• What prior approval covers: The prior approval application must address: (a) transport and highways impacts; (b) contamination risks; (c) flooding risks; (d) impacts of noise from commercial premises on the intended occupants; (e) provision of adequate natural light to all habitable rooms; (f) air quality impacts (in Air Quality Management Areas); (g) for London only — fire safety (a fire statement is required); (h) design and external appearance; and (i) impact on the local provision of services or certain commercial uses (where the LPA has designated such an area)
• Application process and fees: A prior approval application is submitted to the local planning authority (LPA) — the district or borough council. The fee (from April 2024) is £120 per dwelling house to be created, subject to a minimum of £120. The LPA has 8 weeks to determine the application (or longer if agreed). If the LPA fails to determine within the period, prior approval is deemed granted
• LPA can refuse prior approval: The LPA can refuse prior approval on any of the specified criteria. Common grounds for refusal include: inadequate natural light (especially basement or side-lit units); unacceptable noise from adjacent commercial premises; flood risk; and contamination. Refused prior approval means the conversion cannot proceed as PD — a full planning application would be required
• Nationally Described Space Standards: The NDSS — which set minimum room and dwelling sizes — are NOT automatically required for Class MA conversions (unlike some other PD rights). However, many LPAs have adopted policies requiring NDSS compliance for prior approval applications. Check the LPA's local development framework before designing the scheme
• Article 4 directions — removal of PD rights: Local planning authorities can remove PD rights in specific areas using an Article 4 direction. Many central London boroughs, other high-demand areas, and some employment protection zones have Article 4 directions removing Class MA rights. Always check with the LPA before purchasing a building in reliance on Class MA. An Article 4 direction means a full planning application is required instead

Building regulations — separate from planning

Building regulations apply to all conversions regardless of the planning route:

• Mandatory compliance: A commercial-to-residential conversion requires building regulations approval from the local authority building control (LABC) or an approved inspector/registered building control approver (RBCA). Building regs are separate from and additional to planning/prior approval — they govern the technical standards of construction
• Key building regulation requirements for conversions: Structural stability (Part A); fire safety, means of escape, and fire suppression (Part B); thermal insulation and energy efficiency (Part L — which has become more demanding); acoustic separation between dwellings and between commercial and residential uses (Part E); ventilation (Part F); drainage and waste disposal (Part H); and accessibility (Part M — visitability standards for ground floor dwellings)
• Fire safety: Converted residential buildings must comply with Approved Document B. For buildings over 11 metres in height, the Building Safety Act 2022 provisions apply — including registration with the Building Safety Regulator, a Responsible Person, a safety case, and resident engagement obligations. The higher-risk building (HRB) regime applies to residential buildings of 18 metres or 7+ storeys
• Energy performance: Converted dwellings must achieve minimum energy efficiency standards. The SAP (Standard Assessment Procedure) calculation determines the EPC rating. For residential conversions (unlike new builds), the minimum is typically EPC D — but a higher rating (C or above) is increasingly required by BTL mortgage lenders and will be required under future MEES proposals
• Completion certificate: Once the building works are complete, the building control body will carry out a final inspection and issue a completion certificate (or certificate of completion). This is essential documentation for any subsequent sale or mortgage of the converted units

Tax and VAT implications for commercial conversions

Commercial-to-residential conversions have specific tax and VAT treatment:

• 5% reduced rate VAT on conversion works: The conversion of a commercial building to residential use is subject to the 5% reduced rate of VAT on the construction works — rather than the standard 20% rate that applies to most building work. This is a significant saving on a large conversion project. The 5% rate applies to: the conversion itself (including materials supplied by the contractor); services of installing goods as part of the conversion. The landlord/developer cannot reclaim input VAT on these costs unless they are VAT-registered and making taxable supplies (e.g., selling the converted units — which is a zero-rated supply on a new residential building)
• SDLT on acquisition: Purchasing a commercial building attracts non-residential SDLT rates (0% on the first £150,000; 2% on £150,001-£250,000; 5% above £250,000). Non-residential SDLT rates are substantially lower than residential rates — particularly for properties above £250,000. Where the building has mixed use (some residential, some commercial), SDLT is charged at the non-residential (mixed) rates. Once the building is converted to residential use, any subsequent disposal is at residential SDLT rates for buyers
• Capital allowances on commercial element: Where the building was previously a commercial building, the landlord acquiring it may be entitled to claim capital allowances on the commercial fixtures and fittings (heating systems, electrical installations, lift equipment, etc.) present at the time of purchase. These capital allowances can be claimed against income from the commercial element — but once the building is converted to residential use and let, the residential letting rules apply (no capital allowances on residential property — the allowances are available only for furnished holiday lets (FHL) or commercial lets)
• Stamp duty surcharge and company structure: Individuals purchasing a residential property (including a converted residential property) are subject to the SDLT additional dwellings surcharge (3% on top of standard residential SDLT rates) where they already own a residential property. Purchasing through a company attracts the company SDLT rates plus a 3% surcharge. Consider the holding structure — company vs individual — with specialist tax advice before acquisition
• CGT on disposal of converted units: If the landlord sells converted residential units, the gain is subject to CGT at residential property rates (18% basic rate, 24% higher rate for gains after 30 October 2024). If the landlord is VAT-registered and sells the newly converted residential units, the sale is zero-rated for VAT (not exempt) — allowing input VAT recovery on conversion costs. Professional advice on the VAT structure is essential where units are being sold rather than retained for letting

Finance for commercial-to-residential conversions

Development finance for conversions differs from standard buy-to-let mortgages:

• Bridging and development finance: Most commercial-to-residential conversions are financed using bridging loans or development finance — short-term lending (typically 12-24 months) that covers the purchase and conversion costs. Bridging rates are higher than BTL mortgage rates (typically 0.5-1.5% per month). Lenders will typically advance 65-75% of the purchase price and 100% of build costs (to a gross development value (GDV) cap of 65-70%)
• Gross development value (GDV): Development lenders assess the project against GDV — the projected value of the completed residential units. A project with a GDV of £1 million might support total lending of £650,000-£700,000. The feasibility calculation must show sufficient profit margin after finance costs, construction costs, professional fees, and contingency
• Exit finance — refinancing to BTL: On completion, the developer typically refinances (exits) the development loan onto a BTL mortgage or a portfolio BTL loan. BTL lenders will typically lend 65-75% LTV on the completed residential units at standard BTL rates. The exit refinance requires: the building regulations completion certificate; the prior approval compliance; and EPC certificates for each unit
• Title insurance: Where there is any risk of a challenge to the prior approval (e.g., uncertainty about the 3-month vacancy, mixed-use arguments, or Article 4 concerns), title insurance can be obtained to protect the lender and owner against the cost of a successful challenge. Most development lenders require title insurance for PD conversion projects
• Professional team: A commercial-to-residential conversion requires a project architect (for design and building regs applications), a structural engineer, a planning consultant (for prior approval), a solicitor (for purchase, prior approval, and exit refinancing), a building control body, and — for larger projects — a project manager and main contractor

Frequently asked questions