Selling a Converted Commercial Property

Commercial-to-residential conversions have become increasingly common across England, driven by permitted development rights that allow offices, shops, and light industrial buildings to be converted to homes without a full planning application. While these conversions can produce attractive and well-located properties, selling one involves additional considerations that do not apply to standard houses or purpose-built flats.

This guide covers everything sellers need to know about selling a property that was converted from commercial use, from planning documentation and building regulations to mortgage challenges and contamination risks. If you are also interested in other non-standard property types, see our guide on selling a converted barn, which covers similar themes in a rural context.

Planning permission and prior approval

The first thing a buyer's solicitor will investigate is whether the change of use from commercial to residential was lawfully carried out. The route by which the conversion was approved determines what documentation you need to provide.

Permitted development under Class MA

Since 1 August 2021, the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) allows properties in Use Class E to convert to residential use (Use Class C3) under Class MA without a full planning application. Use Class E covers a broad range of commercial uses including shops, offices, restaurants, cafes, light industrial premises, gyms, and health centres.

However, Class MA is not an automatic right. You must obtain prior approval from the local planning authority, which considers matters including:

• Flood risk
• Transport and highways impacts
• Contamination risks
• Impacts of noise from commercial premises on the intended occupiers
• Provision of adequate natural light in all habitable rooms
• Impact on the sustainability of a key shopping area
• Impact on the local provision of registered nurseries and health centres

If your conversion was carried out under Class MA, you should have a prior approval notice from the local planning authority confirming that the conditions were satisfied. This document, together with evidence that any conditions attached to the prior approval were discharged, is what the buyer's solicitor will need.

Full planning permission

Conversions that do not qualify for permitted development — for example, those involving listed buildings, properties in conservation areas where Article 4 directions apply, or buildings that were not in Use Class E — require a full planning application. In this case, you should have the original planning permission decision notice and evidence that all conditions were discharged.

If you cannot locate the planning documents, check the local planning authority's online planning register. If no record exists and the property has been in residential use for at least ten years, you may be able to apply for a certificate of lawful existing use or development (CLEUD) under section 191 of the Town and Country Planning Act 1990.

Older conversions under previous permitted development rights

Before Class MA was introduced in 2021, office-to-residential conversions were permitted under Class O (introduced in 2013), and storage or distribution buildings could convert under Class P. These older rights had different conditions and limitations. If your property was converted under one of these earlier classes, the prior approval notice from that time remains the relevant document. The buyer's solicitor will verify which permitted development right applied and whether the conditions were met.

Building regulations compliance

A change of use from commercial to residential is a material change of use under the Building Regulations 2010, and the conversion work must be inspected and signed off by building control. This applies whether the conversion was carried out under permitted development or full planning permission. The key document is the building regulations completion certificate, which confirms the work met the applicable standards.

For converted commercial properties, building control will have assessed compliance with regulations covering:

• Fire safety (Part B): Residential fire safety requirements differ significantly from commercial ones, particularly regarding means of escape, fire detection, and compartmentation
• Sound insulation (Part E): Where the building is divided into multiple dwellings, sound insulation between units must meet residential standards
• Ventilation (Part F): All habitable rooms must have adequate ventilation, which can be challenging in buildings that relied on mechanical ventilation for commercial use
• Thermal performance (Part L): The conversion must meet energy efficiency standards, though the requirements for conversions are less onerous than for new builds
• Structural integrity (Part A): Any structural alterations made during the conversion must comply

If the completion certificate is missing, see our guide on building regulations sign-off missing for detailed advice on your options, which include applying for a regularisation certificate or obtaining indemnity insurance.

Contamination and environmental considerations

One of the most significant differences between selling a converted commercial property and a standard home is the potential for land contamination. Depending on what the building was previously used for, the land or the building itself may contain pollutants that need to be assessed and potentially remediated.

Former uses that carry higher contamination risk include:

• Petrol stations and motor vehicle workshops
• Dry cleaning premises
• Factories and manufacturing facilities
• Printing works
• Chemical storage or distribution
• Laundries using industrial chemicals
• Electrical substations (potential for PCB contamination)

If the conversion was carried out under Class MA, the local planning authority will have considered contamination as part of the prior approval process. If a contamination assessment was required, you should have a copy of the report and any remediation certificate. The buyer's solicitor will request these documents, and the buyer's mortgage lender may independently require an environmental search to verify the contamination status. For more on the types of searches involved, see our guide on property searches explained.

Mortgage and valuation challenges

Converted commercial properties can present difficulties for buyers seeking a mortgage. Lenders assess the property against their standard criteria, and several features common in commercial conversions can trigger additional requirements or outright refusals.

Issues lenders commonly flag

• Non-standard construction: Commercial buildings often use steel frames, concrete panels, or flat roof construction that some residential lenders do not accept
• Mixed-use elements: If any part of the building retains a commercial use, most residential lenders will decline the mortgage entirely
• Minimum unit size: Some lenders impose minimum floor area requirements (typically 30 square metres for a studio or one-bedroom flat), and conversions that maximise unit numbers can fall below these thresholds
• Inadequate natural light: Flats converted from deep-plan commercial buildings may have habitable rooms with limited natural light, which valuers can flag as a concern
• Incomplete documentation: Missing planning approval, building regulations certificates, or contamination assessments will cause most lenders to decline until the documentation is in order

What sellers can do

As a seller, you cannot control the buyer's mortgage application, but you can make the process as smooth as possible. Providing a complete documentation pack, being transparent about the property's history, and disclosing any known issues upfront all help the lender's valuer reach a decision quickly. If you currently have a mortgage on the property, noting which lender holds it provides the buyer with evidence that at least one mainstream lender has accepted the property. For a full picture of the costs involved in the conveyancing process, see our guide on conveyancing costs breakdown.

The TA6 form and property information

When selling any property in England and Wales, you must complete the TA6 Property Information Form. For a converted commercial property, certain sections require particular attention:

• Section 1 (Boundaries): Commercial properties often have complex boundary arrangements, particularly in multi-unit conversions where the building has been subdivided
• Section 3 (Alterations, planning, and building control): You must disclose the change of use, the route by which it was approved, and whether building regulations sign-off was obtained
• Section 7 (Environmental matters): Disclose any known contamination issues, environmental reports, or remediation work
• Section 9 (Parking): Commercial conversions frequently have different parking arrangements from purpose-built residential developments, and the buyer will want clarity on allocated spaces and any restrictions

If the converted property is leasehold — which is common in flatted conversions of commercial buildings — you will also need to complete the TA7 Leasehold Information Form. See our guide on selling a leasehold flat for the additional steps involved.

Fire safety and the Building Safety Act 2022

Fire safety is a particular concern in converted commercial properties because the original building was not designed for residential occupation. The Building Safety Act 2022 introduced new obligations for building owners, and the buyer's lender will scrutinise fire safety compliance carefully.

Key points for sellers of converted commercial properties:

• The conversion should have provided residential-standard fire detection, means of escape, and compartmentation, as confirmed by the building regulations completion certificate
• For buildings over 18 metres (approximately six storeys), an EWS1 (External Wall System) form may be required by the buyer's lender
• The freeholder or building owner should be able to provide a current fire risk assessment, which the buyer's solicitor will request
• If fire safety remediation work is required, the Building Safety Act 2022 includes protections for qualifying leaseholders that limit their contribution to remediation costs

Insurance considerations

Insuring a converted commercial property can be more complex and more expensive than insuring a standard residential property. Insurers consider several factors specific to commercial conversions:

• Construction type: Commercial buildings frequently use steel frame, concrete panel, or flat roof construction, all of which may attract higher premiums or require specialist cover
• Rebuild costs: The cost of reinstating a converted commercial building may be higher than for a conventional house because of the non-standard construction and the complexity of reproducing the conversion
• Flood risk: Commercial buildings in town centres or near waterways may be in flood risk zones, requiring specialist flood cover
• Adjacent commercial uses: If the building is in a mixed-use area or adjacent to operating commercial premises, insurers may factor in additional risks such as fire spread from neighbouring businesses

Providing the buyer with details of your current insurer, annual premium, and rebuild valuation helps them arrange their own cover without delay. Insurance issues left unresolved can hold up exchange of contracts.

Documentation checklist for sellers

Assembling a complete documentation pack before marketing your converted commercial property is the most effective way to prevent delays during conveyancing. The buyer's solicitor and mortgage lender will expect the following:

1. Planning permission or prior approval notice for the change of use, plus evidence that all conditions were discharged
2. Building regulations completion certificate for the conversion works
3. Contamination assessment and any remediation certificate, if the former use carried environmental risk
4. Fire risk assessment and any EWS1 form for the building
5. EPC certificate (valid for ten years from the date of issue)
6. Title deeds showing any restrictive covenants, easements, or rights of way
7. Lease document (if leasehold), together with the leasehold management pack
8. Buildings insurance policy with rebuild valuation and details of the insurer
9. Warranties for any structural, roofing, or waterproofing works carried out during the conversion
10. Floor plans showing the layout of the converted property, particularly if the building has been subdivided into multiple units

Having these documents ready before you accept an offer allows your solicitor to send a comprehensive draft contract pack to the buyer's solicitor immediately, which can shorten the conveyancing timeline by several weeks.

Market positioning and pricing

Converted commercial properties appeal to a particular segment of the market. Buyers are often attracted by features such as high ceilings, large windows, open-plan layouts, and urban or town-centre locations. However, they may also have concerns about the property's history, construction quality, and resale value.

When marketing a converted commercial property, consider:

• Emphasise the quality of the conversion. High-quality finishes, thoughtful layouts, and evidence of professional workmanship reassure buyers that the conversion was carried out to a good standard
• Be transparent about the history. Buyers will discover the property's commercial origins during conveyancing, so it is better to present this positively from the outset rather than allowing it to emerge as a surprise
• Highlight location advantages. Commercial conversions are often in town centres or well-connected urban locations, which is a significant selling point for commuters and first-time buyers
• Address parking and outdoor space. These are common shortcomings in commercial conversions, so be clear about what is included and any alternatives available nearby

Sources

• Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended), Schedule 2, Part 3, Class MA — legislation.gov.uk
• Town and Country Planning Act 1990 — legislation.gov.uk
• Building Regulations 2010 (as amended) — legislation.gov.uk
• Building Safety Act 2022 — legislation.gov.uk
• The Town and Country Planning (Use Classes) Order 1987 (as amended) — legislation.gov.uk
• Planning Portal — Change of use: planningportal.co.uk
• RICS — Surveys of residential property guidance note: rics.org
• GOV.UK — Contaminated land: gov.uk/contaminated-land
• GOV.UK — When is permission required? Technical guidance on permitted development rights for change of use: gov.uk/government/publications/permitted-development-rights-for-householders-technical-guidance
• Law Society — Property Information Form (TA6), 4th edition: lawsociety.org.uk

Related guides

• Selling a House with a Flying Freehold

Frequently asked questions