Office-to-Residential Conversions: What the 2026 Planning Changes Mean for Owners, Tenants and Buyers

Walk through the centre of Eastbourne, Hastings or Bexhill-on-Sea and you will see the same thing you see in most towns: more office space than anyone now needs, alongside a shortage of homes. Converting offices into flats has become the obvious answer, and for several years the planning system has been shaped to encourage it.

That system shifted again in August 2026. If you own a commercial building, rent space in one, or are thinking of buying a flat in a converted block, it is worth understanding where you now stand before you commit to anything.

This article covers the position in England. Wales has its own planning rules and the permitted development right described below does not apply there.

How does the permitted development route (Class MA) work?

Most office conversions in England rely on a permitted development right known as Class MA. It has been available since August 2021 and allows a building in Use Class E to become residential without a full planning application. Class E is a broad category that covers offices, shops, cafés, gyms, clinics and nurseries, so the right reaches well beyond traditional office blocks.

The main qualifying condition is that the building must have been in Class E use for a continuous period of at least two years before the application is made. Two earlier restrictions were removed in March 2024: there is no longer a cap on the floorspace that can be converted, and the building no longer has to have stood empty beforehand. Large, multi-storey office buildings can therefore now qualify.

Class MA covers the change of use only. External alterations such as new windows, balconies or additional storeys generally need planning permission in their own right unless another permitted development right applies. If you are weighing up whether a building's use can be changed at all, our guide to change of use of a premises is a useful starting point.

Prior approval: what can the council consider?

Permitted development does not mean the council has no say. Before starting work, the owner must apply to the local planning authority for prior approval. The council's assessment is limited to specific matters set out in the legislation:

• transport impacts, particularly safe access to the site
• contamination and flood risk
• the effect of noise from nearby commercial premises on future residents
• adequate natural light in all habitable rooms
• the impact of introducing homes into an area that is important for industry, storage or distribution
• the loss of a registered nursery or NHS health centre, where relevant
• in a conservation area, where the ground floor is changing use, the impact on the character of the area
• for taller buildings, fire safety, on which the council must consult the Building Safety Regulator (an independent body since January 2026)

Every new home must also meet the nationally described space standard. This is a condition of the permitted development right itself rather than something the council weighs up. A scheme that falls short is simply not permitted development.

The council has 56 days to decide, although this can be extended by agreement. If it does not issue a decision within that period, the development can generally go ahead. Once prior approval is granted, the conversion must be completed within three years.

Where Class MA permitted development does not apply

Class MA cannot be used for listed buildings or scheduled monuments. It is also excluded in Sites of Special Scientific Interest, National Parks, the Broads, National Landscapes (formerly Areas of Outstanding Natural Beauty), World Heritage Sites and certain safety-related areas. That matters locally: parts of East Sussex sit within the South Downs National Park or the High Weald National Landscape, so a building that looks like an ideal candidate can be ruled out on location alone. Where a site is occupied under an agricultural tenancy, both landlord and tenant must expressly consent. Conservation areas are not excluded, but they carry the additional ground-floor test described above.

Councils can also withdraw the right in a defined area by making an Article 4 direction. Where one applies, a full planning application is needed instead. Checking for Article 4 directions is essential before buying or investing in a commercial building with conversion in mind.

What changed in the August 2026 National Planning Policy Framework?

On 17 August 2026 the government published a new National Planning Policy Framework, replacing the December 2024 version. The new Framework changes how councils should approach Article 4 directions.

Under the new policy, known as DM10, Article 4 directions should be limited to situations where they are necessary to protect local amenity or the wellbeing of an area. The examples given include supporting the vitality and viability of parts of town centres. Directions must be based on robust evidence and cover the smallest area needed to deal with the harm identified. The previous Framework applied a separate, stricter test to directions aimed at commercial-to-residential conversions, and that test has now gone. A separate policy on planning for town centres also asks councils to consider Article 4 directions where they are justified to support particular centres.

It is important to be clear about what has and has not changed. The Framework is national planning policy, not legislation. The Class MA right itself is unchanged. What has changed is the policy test councils apply when deciding whether to remove it locally. It remains to be seen how many councils will make new directions as a result, but you should not assume that a right available today will still be available when you are ready to start.

The government also consulted during the summer on further changes to permitted development rights, but those proposals do not affect Class MA.

Beyond planning: the other legal issues in an office conversion

Planning is only one of the consents involved. The other legal issues depend on where you sit in the picture.

If you own a commercial building

Planning approval does not override private rights. The title to the property may include restrictive covenants limiting its use. If you hold a leasehold interest, the lease may restrict the use of the building or require the landlord's consent to alterations. Your lender's consent may be needed. Any existing occupational tenants will have their own rights, which may affect your timetable.

Building Regulations apply separately to the conversion works. For higher-risk buildings, broadly those of at least 18 metres or seven storeys containing two or more homes, the Building Safety Regulator acts as the building control authority. You will also need to decide how the new flats will be held and sold, and that decision shapes the long-term management of the building. Where the ground floor is staying commercial, our guide to mixed-use property explains the extra considerations. Our land development solicitors can help you structure the scheme from the outset.

If you are a business tenant

If your landlord plans to convert the building, your lease terms matter. Check for any break clause or redevelopment clause that would allow the landlord to end the lease early. These clauses are often agreed quickly at the start of a tenancy and only read properly when a landlord relies on them, which is one reason we encourage tenants to negotiate a commercial lease carefully.

If your lease is protected by Part II of the Landlord and Tenant Act 1954, you will usually have a right to renew it when the term ends. The landlord can oppose renewal only on specified grounds, which include an intention to demolish or reconstruct the premises, and compensation may be payable in some cases. If your lease was contracted out of the Act, you will have no statutory right to renew.

Statutory notices under the 1954 Act carry strict deadlines. Take advice as soon as you learn of your landlord's plans, and certainly before responding to any notice. Our commercial property disputes team deals with lease renewals and landlord redevelopment claims regularly.

The Law Commission is currently reviewing the renewal regime, including how landlords may oppose renewal on redevelopment grounds. These are proposals only, and the current law continues to apply.

If you are buying a converted flat

Converted office buildings have in the past attracted criticism for the quality of the homes they produced. That criticism is partly why the natural light and space standards were introduced. If you are buying, your conveyancing solicitor will want to check:

• that prior approval was properly granted and its conditions met
• that a building control completion certificate is available
• the fire safety information for the building, particularly if it is a taller block
• the terms of the lease, including service charge and repair obligations

Your lender may also have its own requirements for converted buildings. Converted flats are almost always sold on long leases, so it pays to understand the difference between leasehold and freehold before you make an offer. Our residential conveyancing solicitors act for buyers of converted flats across Eastbourne, Bexhill-on-Sea and Hastings and know what to look for.

Planning an office conversion? Speak to our commercial property solicitors in Eastbourne, Bexhill-on-Sea and Hastings

Office-to-residential conversion can be a sensible way to bring an underused building back into use, but the rules are detailed and the national policy behind them has just changed. Whether you own a building, occupy one or are thinking of buying a home in one, early advice saves money and avoids unpleasant surprises later.

Our commercial property solicitors advise owners, developers, landlords and business tenants across East Sussex on conversions, lease renewals and development projects, and our conveyancing team can guide you through buying a converted flat. Call us on 01323 644222, email enquiries@stephenrimmer.com or book a free initial 30-minute consultation at our Eastbourne, Bexhill-on-Sea or Hastings office.

FAQs: Office-to-residential conversions

Do I need planning permission to convert an office into flats?

Usually not a full planning application. In England, most office conversions use the Class MA permitted development right, which requires prior approval from the council on a limited list of matters rather than full permission. You will still need planning permission for external alterations, and if the council has made an Article 4 direction covering the building, or the property is listed or in an excluded area such as a National Park or National Landscape, the permitted development route is not available.

How long does prior approval take?

The council has 56 days to make a decision, which can be extended by agreement. If no decision is issued in time, the development can generally proceed. Once approval is granted, the conversion must be completed within three years.

Can my landlord end my lease to convert the building into flats?

It depends on your lease. A break clause or redevelopment clause may allow the landlord to end the lease early. If your lease is protected by the Landlord and Tenant Act 1954, you normally have a right to renew, and the landlord can only oppose renewal on specific grounds, one of which is a genuine intention to redevelop. Compensation may be payable. Deadlines under the Act are strict, so take advice as soon as you hear of the plans.

Is it safe to buy a flat in a converted office block?

Many converted flats are well built, but the checks matter more than usual. Your solicitor should confirm that prior approval was granted and complied with, that a building control completion certificate exists, that fire safety information is available for taller blocks, and that the lease terms, service charges and repair obligations are reasonable. Your mortgage lender may have additional requirements for converted buildings.

Disclaimer: The content of this website blog is for general awareness and insight. This is not legal or professional advice and readers should not act upon the information provided, they should seek professional advice based on their own particular circumstances. The law may have changed since this article was published.