At Detailed Planning, we help assess whether a prior approval change of use route may be available, prepare the required drawings and documents, and submit the application to the council.
Prior approval is a permitted development process that allows certain changes of use to take place without a full planning application, provided the proposal meets the relevant rules.
For developers, one of the most important routes is Class MA, which allows certain buildings in Class E commercial, business and service use to change to Class C3 residential use, subject to limitations and prior approval matters. Class MA covers development consisting of a change of use from Class E to dwellinghouses under Part 3 of Schedule 2 of the General Permitted Development Order.
Prior approval is not the same as full planning permission. The council does not assess every planning issue in the same way as a full application. Instead, it considers specific matters set out in the relevant permitted development class.
However, the rules are technical. Not every building qualifies, and external works usually need to be considered separately.
Convert Commercial Space To Residential Use
Bad design can create problems long before construction starts.
A weak layout may waste space, reduce natural light, affect the connection to the garden, increase build costs or make planning permission harder to achieve.
Our architectural design service helps you test the right ideas early, challenge assumptions and develop a proposal that balances design quality, planning strategy, buildability and value.
Our Prior Approval Change Of Use Services
We provide prior approval change of use services for property developers, landlords, investors and business owners.
Site And Use-Class Review
We review the existing building, current use, planning history and likely use class.
This is essential because the correct prior approval route depends on the lawful existing use of the property, not just how the building appears today.
Prior Approval Route Advice
We advise whether the proposal may fall under Class MA or another change of use prior approval route.
Where prior approval is not available, we can advise whether a full planning application, Lawful Development Certificate or alternative route may be more appropriate.
Planning History And Article 4 Checks
We review the planning history and check whether permitted development rights may have been removed.
Article 4 Directions are particularly important for commercial to residential conversions because some councils restrict permitted development rights in defined areas.
Feasibility And Layout Testing
For residential conversions, we can prepare high-level layouts to test how many units may be achievable and whether the proposal is likely to meet minimum space standards, natural light expectations and practical access requirements.
Existing And Proposed Drawings
We prepare the drawings needed for the prior approval application.
This may include existing and proposed floor plans, elevations, sections, site plans, block plans, refuse and cycle storage layouts, access arrangements and unit layouts.
Council Submission And Monitoring
We prepare and submit the prior approval application to the council where agreed.
We act as your agent, monitor the application and respond to reasonable council queries during the process.
Class MA: Commercial, Business And Service To Residential
Class MA is currently one of the most important prior approval routes for developers.
It allows certain buildings in Class E commercial, business and service use to change to Class C3 residential use, subject to limitations, conditions and prior approval matters.
Class E can include a range of commercial uses, such as shops, offices, financial and professional services, restaurants, indoor sport, medical services, nurseries and other commercial, business or service uses.
However, Class MA does not automatically apply to every commercial building.
The application may need to address matters such as transport, contamination, flood risk, noise, natural light, conservation impacts and the effect of losing certain local services, depending on the site and proposal.
For developers, the key question is not simply “is it Class E?” but whether the building meets all relevant conditions and whether the resulting residential scheme is likely to be acceptable under the prior approval assessment.
External Works May Need Separate Planning Permission
Prior approval for change of use often deals mainly with the change of use itself.
It may not authorise all external alterations needed to make the building work as residential accommodation.
For example, new windows, doors, rooflights, external staircases, bin stores, cycle stores, plant, vents, shopfront changes or façade alterations may need a separate planning application.
This is especially important for commercial-to-residential conversions because the building may need physical changes to create acceptable homes.
We can advise whether the prior approval application should be coordinated with a separate planning application for external works.
Projects That May Suit Prior Approval Change Of Use
Prior approval can be useful for developers assessing whether an existing building can be converted to a higher-value use.
Prior approval can sometimes help unlock value from redundant or underused commercial buildings.
However, the council may still assess specific matters depending on the prior approval class, such as transport, contamination, flood risk, noise and the impact of introducing residential use.
Other Change Of Use Prior Approval Routes
Other prior approval routes may apply to certain agricultural buildings, light industrial buildings or sui generis uses.
These routes are more specialised and need to be checked carefully against the current permitted development rules before a strategy is agreed.
Prior approval change of use applications need a careful mix of planning strategy, layout design and practical development advice.
Developer-Focused Advice
We understand that developers need to assess risk, value, unit yield, programme and planning route before committing too much time or money.
Class MA Experience
We can advise on commercial to residential, office to residential and retail to residential prior approval routes, including the main risks that often affect these schemes.
Planning And Design Together
We can test layouts while considering planning constraints, natural light, access, refuse, cycle storage and marketability.
Application Management
We prepare the drawings, documents and submission package, then monitor the application through the council process.
Honest Risk Advice
We will explain if a proposal is likely to be sensitive, high risk or better suited to pre-application advice before an application is submitted.
Next-Stage Support
If prior approval is granted, we can help with external works applications, building regulations drawings, structural coordination and technical design.
Why Prior Approval Change Of Use Applications Fail
Prior approval is often misunderstood.
It is not a shortcut that avoids all planning risk. It is a specific permitted development route with strict conditions, limitations and assessment matters.
Common risks include:
The existing use class is not properly evidenced
The building is affected by an Article 4 Direction
The site is in a restricted location
The proposal fails minimum space standards
The flats have poor natural light or outlook
Noise from commercial uses, roads or nearby industry is not addressed
Transport and highways impacts are not properly considered
Flood risk or contamination issues are ignored
External alterations are needed but not separately addressed
The proposal depends on building works not covered by prior approval
The wrong prior approval class is used
The application lacks clear drawings or supporting evidence
The Planning Portal notes that changes of use from one use class to another generally require planning permission, but some exceptions may be covered by permitted development rights.
Our role is to identify the correct route and help avoid submitting an application that fails because the basic conditions were not met.
We start by reviewing the building, current use, planning history, constraints and development objective.
We check whether a prior approval route may be available and whether Class MA, another permitted development route or a full planning application is more appropriate.
2. Feasibility Layouts And Evidence Check
We prepare or review concept layouts to test whether the conversion works.
We also identify what evidence may be needed to support the application, such as use-class evidence, transport information, noise reports, flood risk assessment, contamination information or natural light assessment.
3. Drawings And Application Documents
We prepare the existing and proposed drawings and supporting documents for the prior approval submission.
This may include unit layouts, access arrangements, refuse and cycle storage, elevations, site plans, planning statement and consultant reports where required.
4. Submission, Monitoring And Next Steps
We submit the application to the council where agreed and act as your agent during the process.
We monitor the application, respond to reasonable queries and advise on the decision.
If prior approval is granted, we can assist with next steps such as planning applications for external works, building regulations drawings, structural coordination and conditions.
If you are considering converting an office, shop, commercial unit or upper floor into residential use, we can help assess whether a prior approval route may be available.
Send us the address, existing use information, floor plans and a short description of the proposal.
We will review the opportunity and advise on the most suitable next step.
Prior approval is a process where certain changes of use are permitted in principle, but the council must first consider specific planning matters.
The exact matters depend on the relevant permitted development class.
For example, Class MA allows certain Class E commercial, business and service buildings to change to Class C3 residential use, subject to limitations and prior approval requirements.
Some offices fall within Class E and may be capable of conversion to residential use through Class MA.
However, the building must meet the relevant conditions, and the application may need to address matters such as transport, noise, flood risk, contamination, natural light and Article 4 restrictions.
Some shops and retail premises fall within Class E and may qualify for Class MA commercial to residential prior approval.
However, each site must be checked carefully. Active frontage, access, local services, conservation issues, external works and Article 4 restrictions may all affect the route.
Upper floors above commercial premises can sometimes be converted to residential use, but the route depends on the lawful existing use, access, layout, building arrangement and local restrictions.
The Planning Portal notes that space above certain shops or ground-floor offices may be capable of conversion to flats subject to permitted development conditions and prior approval.
Class E is the commercial, business and service use class.
It can include a range of uses such as shops, offices, restaurants, financial and professional services, indoor sport, medical services, nurseries and other commercial or service uses.
The exact use and planning history still need to be checked before relying on a Class E to residential route.
Common issues include Article 4 Directions, the wrong existing use, lack of evidence, poor natural light, flood risk, contamination, transport impact, noise, conservation constraints and the need for external works not covered by the change of use route.
An Article 4 Direction is a local planning restriction that removes certain permitted development rights in a defined area.
For commercial to residential conversions, this can mean a full planning application is required even if the building might otherwise fall within a prior approval route.
Prior approval may allow the change of use, but external alterations such as new windows, doors, rooflights, shopfront changes, vents or external staircases may need separate planning permission.
This is a key issue for developers because many commercial buildings need physical changes to work as residential accommodation.
Timescales vary depending on the application type and council workload, typically 8 weeks.
Some prior approval applications have fixed determination periods set by the relevant regulations, but validation delays, missing information and council queries can affect the overall programme.
We will advise on likely timescales once the route is confirmed.
Prior approval is not guaranteed. The building must meet the relevant conditions, and the council must be satisfied on the specific prior approval matters.
A weak layout, missing evidence or site constraint can lead to refusal.
However, it may sometimes be quicker or more cost-effective to address the refusal reasons and resubmit, especially where the issue relates to missing evidence, layout quality or consultant information.
After prior approval is granted, you may still need other approvals before building work starts.
This can include planning permission for external works, building regulations drawings, structural calculations, fire strategy, noise design, drainage, party wall matters and discharge of conditions.
