Tiny House Sizes UK 2026

Shepherd's Huts, Caravans, Park Homes, and Why the UK Has No Legal Path to a Sub-37 m² Dwelling

By Oliver Wakefield-Smith, Digital Signet

Last verified 7 May 2026 · Sourced from NDSS 2015 (gov.uk), Caravan Sites Act 1968 (legislation.gov.uk), GDPO 2015 (gov.uk), Mobile Homes Act 1983

30 m² = 323 ft²

Typical static caravan (3.7 m x 8 m). The most common “tiny home” format in the UK.

Shepherd's hut typical

15 m²

NDSS habitable min

37 m²

Park home max (Act)

136 m²

The “tiny house movement” is a well-established phenomenon in the United States, where micro-dwellings of 12-37 m² (130-400 sq ft) can legally be used as permanent principal residences in many states. The UK context is fundamentally different. Since the Nationally Described Space Standard (NDSS 2015, gov.uk) was adopted by Local Planning Authorities across England and made mandatory in London under the London Plan 2021 (london.gov.uk), any new dwelling intended for human habitation must have a Gross Internal Area of at least 37 m² (398 sq ft) for a single-person studio with a shower room. Sub-37 m² structures exist in the UK, but they are classified as caravans, shepherd's huts, or holiday accommodation, not permanent habitable dwellings.

This guide covers the four main UK “tiny home” categories, their sizes in m² and sq ft, the legal frameworks that govern them, and a direct comparison with the US tiny house movement.

UK Tiny Home Types: Size Comparison

Type	Typical m²	Typical sq ft	Notes
Shepherd's hut (typical)	15	161	Typical UK shepherd's hut: 3 m wide x 5 m long. Road-legal, so treated as a vehicle/caravan under planning law, not a dwelling.
Static caravan / touring caravan (typical)	30	323	Typical layout: 3.7 m x 8 m = 29.6 m². Larger 'holiday static' models run to 3.7 m x 12 m = 44 m². Subject to Caravan Sites Act 1968 (legislation.gov.uk).
Tiny home on wheels (UK builder, e.g. THOW)	24	258	Custom-built tiny homes from UK builders such as Tiny Eco Homes UK typically run 18-30 m². Road-legal versions must stay under 2.55 m wide and 12 m long.
Park home / residential mobile home (small)	55	592	Residential park homes under the Caravan Sites Act 1968 can reach the statutory maximum: 20 m x 6.8 m = 136 m². Typical small park home: 55-70 m².
Park home / residential mobile home (large)	100	1076	Twin-unit park homes assembled on site can reach 80-100+ m². Still legally a 'caravan' provided each unit meets the Caravan Sites Act 1968 single-unit dimension test before assembly.
NDSS minimum studio flat (habitable dwelling)	37	398	NDSS 2015, Table 1: 1 bedroom, 1 person, shower room. This is the lowest floor area at which a new dwelling can be granted planning permission for human habitation in adopting Local Planning Authorities across England (gov.uk).
NDSS minimum 1-bed flat (2-person)	50	538	NDSS 2015, Table 1: 1 bedroom, 2 persons, single-storey. Mandatory in London under the London Plan 2021 (london.gov.uk). Optional elsewhere but widely adopted.
US tiny house (American movement average)	21	226	The American Tiny House Association cites 9-37 m² (100-400 sq ft) as the typical US tiny-house range, with ~21 m² (226 sq ft) the most common build size. Legal for habitation in many US states.

Sources: NDSS 2015, Table 1 (gov.uk); Caravan Sites Act 1968, s.13 (legislation.gov.uk); Tiny Eco Homes UK builder specs (2024); American Tiny House Association size guidance.

The Four UK Tiny Home Categories Explained

Static caravan (holiday and residential)

30-44 m²

323-474 sq ft

The most common UK “small home” format. A standard static caravan is typically 3.7 m wide and between 8 m and 12 m long, giving a floor area of roughly 30-44 m² (323-474 sq ft). The statutory definition of a “caravan” under the Caravan Sites Act 1968 (legislation.gov.uk), s.13, requires each structural unit to be no more than 20 m long and 6.8 m wide, with an internal height no greater than 3.05 m. A twin-unit caravan assembled from two sections, each meeting these limits, also qualifies. Caravans on licensed sites do not need individual planning permission for the caravan itself; the site licence covers the use of land.

Shepherd's hut

12-20 m²

129-215 sq ft

A traditional shepherd's hut sits on iron wheels and measures typically 3 m wide by 4-5 m long, giving a floor area of 12-15 m² (129-161 sq ft). Modern shepherd's huts sold for glamping and holiday use by UK builders run slightly larger, up to 3 m by 6.5 m (20 m²). Because they are wheeled and road-legal, shepherd's huts are generally treated as caravans for planning purposes, provided they meet the Caravan Sites Act 1968 dimension criteria. They can be sited on licensed holiday sites or used under Schedule 2, Part 4, Class E of the GDPO 2015 for up to 28 days per year without planning permission. Using a shepherd's hut as a permanent year-round dwelling requires a site licence, planning permission for residential use, and would be refused planning permission in any NDSS-adopting authority because the floor area falls well below the 37 m² minimum.

Tiny home on wheels (THOW)

18-30 m²

194-323 sq ft

UK-built tiny homes on wheels, offered by builders such as Tiny Eco Homes UK and Custom Tiny Homes, typically run 18-30 m² (194-323 sq ft). Road-legal builds must comply with the Road Vehicles (Construction and Use) Regulations 1986, limiting width to 2.55 m for standard road transport (up to 3.0 m with police notification for abnormal loads). Because these structures are wheeled, they generally qualify as caravans under the Caravan Sites Act 1968 if they also meet the 20 m / 6.8 m dimension limits. The planning position is identical to shepherd's huts: use as a permanent principal residence is not permissible without a full planning permission for residential development, which would be refused in any NDSS-adopting area on grounds that the floor area is below 37 m².

Park home (residential mobile home)

55-136 m²

592-1,464 sq ft

Residential park homes are the legitimate UK route to a permanently occupied smaller home outside the conventional planning system. They are twin-unit caravans meeting the Caravan Sites Act 1968 dimension limits, sited on licensed residential parks under the Mobile Homes Act 1983. Residents hold a mobile home agreement with full residential security of tenure, equivalent in many respects to an assured tenancy. A typical single-unit residential park home runs 55-70 m² (592-753 sq ft). A twin-unit assembled on site can reach 80-136 m² (861-1,464 sq ft) -- the upper end exceeds the Caravan Sites Act single-unit limits for each section but qualifies as a twin-unit caravan once assembled. Park homes are not subject to the NDSS because they do not require a planning permission for a dwelling.

Caravan Sites Act 1968: Statutory Dimension Limits

Section 13 of the Caravan Sites Act 1968 (legislation.gov.uk) defines the maximum dimensions for a structure to qualify legally as a “caravan.” Exceeding these limits means a structure is a building, not a caravan, and requires planning permission as a new structure.

Dimension	Statutory limit
Maximum length (single unit)	20 m (65.6 ft)
Maximum width (single unit)	6.8 m (22.3 ft)
Maximum internal height	3.05 m (10 ft)
Twin-unit maximum width (assembled)	No separate statutory limit; combined unit assessed as one caravan

Source: Caravan Sites Act 1968, s.13 (legislation.gov.uk). A twin-unit caravan is defined as one assembled from two sections, each meeting the single-unit limits above.

Planning Permission Routes for UK Tiny Homes

Caravan on licensed site (holiday)

Temporary (licence conditions)NDSS does not apply

A caravan (including a shepherd's hut or tiny home on wheels) on a site licensed under the Caravan Sites Act 1968 does not need separate planning permission for the caravan itself. The licence covers the use of land. Holiday sites typically restrict the length of any occupancy, commonly 11 months per year.

Caravan on residential park home site

Permanent residentialNDSS does not apply

Residential park homes require a site licence and the occupant must hold a mobile home agreement under the Mobile Homes Act 1983. The caravan must comply with Caravan Sites Act 1968 dimension limits. Park home residents have the same rights as assured tenancy holders. The NDSS does not apply.

Permitted development (GDPO Class E: temporary use of land)

28 days per year maximumNDSS does not apply

Schedule 2, Part 4, Class E of the Town and Country Planning (General Permitted Development) Order 2015 (GDPO) allows a caravan or tent to be placed on land for up to 28 days per year without planning permission, provided the land is not in an Article 2(3) area (AONB, National Park, etc.). This is not a route to permanent habitation.

Full planning permission for permanent habitable dwelling

PermanentNDSS applies

Any structure intended as a permanent habitable dwelling must obtain full planning permission and comply with Building Regulations. Where the Local Planning Authority has adopted the NDSS, the minimum Gross Internal Area is 37 m² (1-person studio with shower room). This effectively makes a US-style 9-21 m² tiny house impossible to use as a permanent UK residence.

Sources: Town and Country Planning (General Permitted Development) Order 2015, Schedule 2, Part 4, Class E (legislation.gov.uk); Caravan Sites Act 1968 (legislation.gov.uk); Mobile Homes Act 1983 (legislation.gov.uk); NDSS 2015 (gov.uk); London Plan 2021 (london.gov.uk).

Why UK Habitable Dwellings Cannot Be Legally Smaller Than 37 m²

The Nationally Described Space Standard (NDSS 2015, gov.uk) sets the minimum Gross Internal Area for any new dwelling in England where a Local Planning Authority has adopted the standard. The lowest threshold in the table is 37 m² (398 sq ft) for a 1-bedroom, 1-person studio flat with a shower room (NDSS Table 1: 1b 1p, shower room, 1-storey). A studio with a full bathroom requires 39 m² (420 sq ft).

The NDSS is a planning policy standard, not a Building Regulation, meaning it is enforceable only in areas where it has been formally adopted by the Local Planning Authority through their Local Plan. However, it is mandatory across all 33 London boroughs under Policy D6 of the London Plan 2021 (london.gov.uk) and has been adopted by a substantial proportion of English LPAs outside London. No part of England has adopted a minimum dwelling standard below 37 m².

Key distinction: caravan vs dwelling

The NDSS applies to dwellings, not to caravans. A structure that legally qualifies as a caravan under the Caravan Sites Act 1968 is not subject to the NDSS regardless of its floor area. The legal boundary between a caravan and a dwelling is the key determination in UK tiny-home planning disputes. A structure that is immovable, connected to permanent services in a fixed way, or exceeds the Caravan Sites Act dimension limits is likely to be treated as a building requiring planning permission as a dwelling, and the NDSS will then apply.

NDSS configuration	Min GIA (m²)	Min GIA (sq ft)	Storage (m²)
1b 1p, shower room, 1-storey	37	398	1
1b 1p, full bath, 1-storey	39	420	1
1b 2p, 1-storey	50	538	1.5
2b 3p, 1-storey	61	657	2

US Tiny House Movement vs UK Reality

The contrast between the US and UK tiny house markets reflects fundamentally different land-use planning systems. In the US, many states have adopted specific tiny house codes or zoning allowances that permit structures of 9-37 m² (100-400 sq ft) to be used as permanent residences, whether on a foundation, on wheels, or in a “backyard dwelling unit” arrangement. Texas, Oregon, and California have been particularly active in creating legal pathways.

Factor	UK	US
Minimum habitable dwelling size	37 m² (398 sq ft) under NDSS in adopting LPAs	No national minimum; some states permit 9 m² (100 sq ft)
Typical tiny house size (movement)	18-30 m² (THOW/shepherd's hut) -- but not legally habitable	12-25 m² (130-270 sq ft) -- legally habitable in many states
Legal route to permanent tiny living	Residential park home (55+ m²) or narrowboat only	Tiny house on foundation, ADU, or THOW on approved site
Caravan / RV regulation	Caravan Sites Act 1968: 20 m x 6.8 m max per unit	ANSI 119.5 (THOW standard); HUD code for manufactured homes
Planning / zoning system	Centralised; NDSS adopted by most major LPAs	Localised; county/city zoning varies widely

Sources: NDSS 2015 (gov.uk); American Tiny House Association size guidelines; ANSI A119.5-2015 (Recreational Park Trailer standard); Caravan Sites Act 1968 (legislation.gov.uk).

Convert a Tiny Home Size

Square Metres (m²)

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30 m² is approximately a compact studio flat.

Frequently Asked Questions

Can I legally live in a tiny house in the UK?

It depends on the structure and the site. A 'tiny house' that qualifies as a caravan under the Caravan Sites Act 1968 (no more than 20 m long and 6.8 m wide when assembled) can be lived in on a licensed residential park home site under the Mobile Homes Act 1983, with full residential security of tenure. A structure that is a permanent dwelling on private land needs full planning permission and must meet the NDSS minimum of 37 m² (Gross Internal Area, 1-person studio) if the Local Planning Authority has adopted the standard, which includes all London boroughs under the London Plan 2021 (london.gov.uk). A 15 m² shepherd's hut or 21 m² tiny home on wheels cannot lawfully be used as a permanent principal residence on land you own without planning permission, and planning permission for a sub-37 m² dwelling will not be granted in NDSS-adopting areas.

What is the Caravan Sites Act 1968 maximum size for a caravan?

Section 13 of the Caravan Sites Act 1968 (legislation.gov.uk) defines a 'twin-unit caravan' as a structure assembled from no more than two sections, each of which does not exceed 20 metres in length and 6.8 metres in width, with a maximum internal height of 3.05 metres. A structure exceeding these dimensions is not a 'caravan' in law and therefore falls outside the Caravan Sites Act licensing regime, requiring planning permission as a building.

What does GDPO Class E mean for tiny houses?

Schedule 2, Part 4, Class E of the Town and Country Planning (General Permitted Development) Order 2015 (GDPO) grants permitted development rights for the use of land as a caravan site for up to 28 days in any calendar year, provided the land is not in a restricted zone (Article 2(3) land such as AONBs, National Parks, and World Heritage Sites). This means you can place a caravan or tiny home on wheels on your land for short periods without full planning permission. It does not permit permanent or long-term residential occupation.

Why is 37 m² the UK minimum for a habitable home?

The 37 m² figure comes from NDSS Table 1 (gov.uk, 2015): it is the minimum Gross Internal Area for a 1-bedroom 1-person studio flat with a shower room. The NDSS was introduced by the Department for Communities and Local Government (DCLG, now MHCLG) in March 2015 and became mandatory in London via the London Plan 2021. The standard does not apply retrospectively to existing homes, but it sets the floor for any new planning application for residential development in adopting Local Planning Authorities. The NDSS is a planning standard, not a Building Regulation, so it technically only applies in authorities that have formally adopted it.

How does the US tiny house movement compare to UK rules?

The American Tiny House Association defines a tiny house as up to 37 m² (400 sq ft), with the most popular builds running 12-25 m² (130-270 sq ft). Many US states have created specific zoning allowances for tiny houses on foundation or on wheels. In the UK, a 12-25 m² structure would need to be classified as a caravan (legal on a licensed site) or would require full planning permission as a dwelling, which would be refused in any NDSS-adopting authority because it falls below the 37 m² minimum. The practical result is that the US-style tiny house movement has not taken hold in the UK in the same way -- UK 'tiny living' is channelled into park homes, shepherd's huts on holiday sites, and narrowboats rather than permanent micro-dwellings.

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Minimum Room Sizes UK

NDSS Table 1 in full, HMO Housing Act minimums, and Building Regs coverage.

About the author

Oliver Wakefield-Smith

Founder of Digital Signet, an independent research firm publishing data-led property, planning, and conversion tools. Content is sourced from ONS, Nationwide, RICS, MHCLG planning data, and UK building regulations. Confirm planning and regulatory figures with your local authority or a qualified professional.

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