Converting an office to flats or houses uses Class MA permitted development rights since 2021. Here’s how the process works, what the council can assess, and where Article 4 Directions block it.
Converting an office building to residential use is permitted development under Class MA of Part 3 of the GPDO 2015 (replacing Class O in August 2021). The building must be in Class E(g)(i) office use, have been vacant for 3 months, and in office use for 2 years. Prior Approval is required — 56-day determination period. Many town centres have Article 4 Directions removing Class MA to protect commercial floorspace; in those areas a full planning application is required. Class MA does not require affordable housing or usually trigger CIL, making it financially favourable.
Office-to-residential permitted development rights have existed since 2013, originally as Class O of Part 3 of the GPDO. Class O was controversial — it allowed mass conversion of office stock in some areas without the affordable housing and design requirements that planning permission would impose.
In 2021, the government replaced Class O (and the old Class M retail-to-residential right) with the broader Class MA, which covers the whole of the new Class E commercial use class. Class MA introduced two new conditions not in Class O: the 3-month vacancy requirement and the 2-year prior use requirement. These conditions were intended to prevent Class MA being used to convert occupied offices during temporary vacancies.
To convert an office to residential under Class MA:
| Condition | Detail |
|---|---|
| Application fee | £120 per dwelling to be created |
| Determination period | 56 days from valid application acknowledgement |
| Assessment matters | Transport, contamination, flooding, noise, natural light, conservation area character |
| Affordable housing | Not required under Class MA |
| Listed building exclusion | Class MA does not apply to listed buildings |
Many councils have made Article 4 Directions removing Class MA in their town centres and commercial areas. These are particularly common in:
In areas with Article 4 Directions, a full planning application is required for office-to-residential conversion. The application will be assessed against the Local Plan’s commercial floorspace policies, which often resist loss of employment floorspace in designated employment areas.
Once an office building is converted to residential use under Class MA, the resulting dwellings are subject to the standard Part 1 permitted development rights for houses (extensions, outbuildings, solar panels) where applicable. A converted office building will have the same PD rights as any other residential building of the same type.
However, for flat conversions (which are common in office-to-residential schemes), Part 1 PD rights don’t apply in the same way as for houses — flats have more limited PD rights. Common works in flat developments (roof extensions, satellite dishes on shared buildings) are assessed under Part 1, Class H or Class E as appropriate.
Extensions, loft conversions, outbuildings, solar panels — our complete guide covers everything you can build without planning permission.
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