Will minimum space standards become a part of building regulations?

It is a planning standard, not a general minimum size requirement in Building Regulations. Where an applicable planning policy requires NDSS, residential schemes need to meet the relevant standards.

The standard is intended to help ensure that new homes provide adequate space for everyday living, including sleeping, storage and circulation.

National Space Standards: Minimum Dwelling Sizes

The NDSS sets minimum gross internal areas according to the number of bedrooms, bedspaces and storeys in a dwelling. It also specifies minimum built-in storage requirements.

The official figures are set out in the government’s Technical housing standards – nationally described space standard
.

NDSS minimum floor areas and built-in storage

Insert the official Table 1 as an accessible HTML table here, with the dwelling type, bedspaces, storey count, minimum GIA and built-in storage columns.

The standard includes a specific exception for a one-bedroom, one-person dwelling with a shower room, which has a minimum GIA of 37m².

How bedrooms and bedspaces are classified

A bedroom is not the same as a bedspace. The number of bedspaces reflects the intended occupancy of the dwelling, and the NDSS uses this alongside bedroom count to determine the applicable minimum floor area.

The standard also includes separate requirements for single, double and twin bedrooms, so the overall floor area is not the only consideration.

Minimum Bedroom Sizes Under NDSS

The NDSS sets minimum bedroom areas and widths for new dwellings where the standard applies.

A single bedroom must have a minimum area of 7.5m² and a minimum width of 2.15m.

A double or twin bedroom must have a minimum area of 11.5m².

At least one double or twin bedroom in a dwelling must be at least 2.75m wide.

Any other double or twin bedroom must be at least 2.55m wide.

What Counts Towards Gross Internal Area?

Gross internal area is measured between the internal faces of the perimeter walls of a dwelling. The NDSS includes internal partitions, structural elements, cupboards, ducts, stairs and certain areas above stairs, subject to the standard’s detailed provisions.

The standard also includes requirements for built-in storage and floor-to-ceiling height.

This means a dwelling should not be assessed by looking at the total floor area alone. The bedroom sizes, widths, storage and other requirements need to be considered together.

When Does the Nationally Described Space Standard Apply?

NDSS is not automatically mandatory for every new home in England. Its application depends on the relevant planning policy and the development route.

Local planning authorities can adopt the standard through their local plan or other applicable planning policy. Where that policy applies, residential proposals need to demonstrate compliance.

Permitted development has separate statutory space-standard requirements for relevant residential conversions. These should be checked against the applicable legislation rather than assumed to be the same as ordinary planning-policy requirements.

Are National Space Standards Mandatory?

The Nationally Described Space Standard is not a universal requirement in Building Regulations. It is a planning standard that can be applied through relevant planning policies in England.

The important distinction is between a general Building Regulations requirement and a space standard that applies because of a local planning policy or a permitted-development condition.

For a proposed residential scheme, the relevant planning policy and development route should be checked before deciding whether NDSS applies.

How Do London Plan Space Standards Differ?

The London Plan incorporates the Nationally Described Space Standard into its residential design requirements.

London also includes additional requirements, including a minimum floor-to-ceiling height of 2.5m for at least 75% of the GIA in relevant dwellings. The national standard specifies a 2.3m minimum floor-to-ceiling height for at least 75% of GIA.

For schemes in London, the NDSS figures should therefore be considered alongside the applicable London Plan policies and any relevant local requirements.

For further information about planning support in London, see enevo’s GLA Planning Statements
.

NDSS vs Other Minimum Bedroom-Size Rules

The Nationally Described Space Standard is not the only set of requirements relating to bedroom sizes.

HMO licensing has its own minimum room-size requirements, while statutory overcrowding rules address the number of people who can occupy a dwelling in certain circumstances.

These requirements should not be treated as interchangeable. The relevant standard depends on the type of accommodation and the circumstances of the project.

Will Space Standards Become Part of Building Regulations?

The original question remains relevant, but it is important to distinguish between national planning standards and Building Regulations.

The NDSS is a planning standard rather than a universal Building Regulations requirement. Changes to planning policy or the national planning framework may affect how space standards are applied, but they should not be assumed to change the Building Regulations position.

For the current position, refer to the official NDSS guidance
and the government’s optional technical housing standards guidance
.

Frequently Asked Questions About Space Standards

What does NDSS stand for?

NDSS stands for Nationally Described Space Standard. It sets minimum space requirements for new residential dwellings in England, including dwelling floor area, bedroom sizes and built-in storage.

Are national space standards mandatory in the UK?

Not as a universal Building Regulations requirement. NDSS can apply through planning policy in England, and separate statutory requirements apply to relevant permitted-development routes.

What is the minimum bedroom size in the UK?

There is no single universal minimum bedroom size for every type of accommodation across the UK. Under NDSS in England, a single bedroom must be at least 7.5m² and a double or twin bedroom at least 11.5m², where the standard applies.

How do London Plan space standards differ from the national standard?

The London Plan incorporates NDSS and includes additional residential design requirements, including a 2.5m minimum floor-to-ceiling height for at least 75% of GIA in relevant dwellings.

What counts towards gross internal area (GIA)?

GIA is measured between the internal faces of the perimeter walls. It includes internal partitions, structural elements, cupboards, ducts, stairs and certain areas above stairs, subject to the NDSS rules.