Space standards can directly affect planning outcomes
Many councils now apply the Nationally Described Space Standards through their Local Plans. Where adopted, residential proposals may be refused if the accommodation fails to meet the required floor areas, bedroom sizes, storage requirements or internal layout standards. Similarly, schemes progressed through change of use permitted development rights must adhere to the Nationally Described Space Standards or they will be refused.
What are minimum space standards?
Minimum space standards are planning standards which seek to ensure that new homes provide an acceptable standard of accommodation for future occupiers. They establish minimum internal floor areas, bedroom sizes, storage requirements and internal dimensions for residential development.
The most widely used standards in England are the Nationally Described Space Standards (NDSS). These standards were introduced by Government in 2015 and can be adopted by local planning authorities through their Local Plans. Importantly, they do not automatically apply everywhere. Whether they apply to your site will depend on the policies adopted by the relevant council.
At Cedar Planning we have developed a free and interactive tool to help you see if your proposal meets the Nationally Described Space Standards.
Why do minimum space standards matter?
Avoid refusals
Many residential schemes are amended during the planning process because they fail to meet adopted space standards.
Better living conditions
Adequate internal space contributes towards a healthier and more practical living environment.
Future-proof schemes
Designing to the correct standards early can reduce delays and redesign costs.
What do the Nationally Described Space Standards require?
The NDSS establish minimum gross internal floor areas based on the number of bedrooms, occupancy levels and storeys. The standards also include minimum bedroom dimensions, storage requirements and minimum ceiling height expectations.
| Dwelling Type | Minimum Size |
|---|---|
| 1 Bedroom / 1 Person / 1 Storey | 39m² (37m² with a shower room) |
| 1 Bedroom / 2 Person / 1 Storey | 50m² |
| 2 Bedroom / 3 Person / 1 Storey | 61m² |
| 2 Bedroom / 3 Person / 2 Storey | 70m² |
| 2 Bedroom / 4 Person / 1 Storey | 70m² |
| 3 Bedroom / 5 Person / 1 Storey | 86m² |
The full standards include a much wider range of dwelling types and occupancy levels. Councils will often assess proposed floor plans carefully to ensure compliance.
Minimum bedroom sizes explained
One of the most common planning questions relates to minimum bedroom sizes. Under the NDSS, a single bedroom should generally provide at least 7.5 square metres of floor area and a minimum width of 2.15 metres. Double bedrooms should normally provide at least 11.5 square metres.
Councils often examine bedroom layouts closely, particularly in flat conversions, and higher-density developments where internal space is under pressure.
Do space standards apply to flat conversions?
Often, yes. Where Councils apply space standards to residential development this often includes flat conversions. If you intend to use a change of use permitted development right to convert a property, you will need to ensure compliance with the NDSS. Even where the standards are not formally adopted, poor internal living conditions can still be a planning concern.
Preparing a residential planning application?
A well-designed scheme that addresses internal space standards from the outset is often easier to defend through the planning process.
Do all Councils apply minimum space standards?
No. Nationally Described Space Standards are not mandatory everywhere. Local authorities must adopt them through their planning policies before they can normally require compliance. This means that the position varies across England.
However, even where formal adoption has not occurred, poor living conditions can still be a planning issue through design, amenity and housing quality policies.
It should also be noted that if your proposal meets the minimum space standards this does not guarantee that the Council will find that it will give residents a good standard of living. Planning applications can still be refused if occupants would have unacceptable levels of daylight and sunlight, or noise pollution from neighbouring uses is too high.
Do Nationally Space Standards Apply to HMOs
The Nationally Described Space Standards apply to flats and houses, and does notapply for HMOs. However, in many areas your HMO rooms and amenity space will need to meet certain thresholds to comply with the relevant planning permission or licensing requirements.
Space standards and Design & Access Statements
Where residential schemes are proposed, a strong Design and Access Statement can help explain how the development provides a high quality living environment. This can include analysis of floor areas, internal layouts, natural light, storage provision and compliance with local planning policies.
For larger or more complex schemes, this can be an important part of demonstrating design quality and policy compliance.
Common planning mistakes involving space standards
- Assuming space standards do not apply.
- Incorrectly applying single storey requirements to maisonettes or flats over two storeys
- Providing undersized bedrooms.
- Failing to account for storage requirements.
How Cedar Planning can help
Cedar Planning advises developers, architects, homeowners and landowners on residential planning proposals throughout England. We regularly assess residential schemes against local planning policies, housing standards and design requirements before submission.
Whether you are preparing a flat conversion, residential redevelopment or new-build housing proposal, we can help identify planning risks and prepare a robust planning strategy.
Need advice on residential space standards?
Cedar Planning can review your scheme, identify potential planning issues and help prepare a robust planning application strategy.
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Dan Malloy MRTPIDirector and Chartered Town Planner at Cedar Planning, with more than ten years of public and private-sector planning experience. About Cedar Planning
