Planning Permission and Use Classes Explained: What Is the Difference Between C2, C3, C4 and C1?

Introduction

Planning use class is a key part of commercial property due diligence. It helps establish how a property may be occupied and operated.

This matters when buying, converting, letting or refinancing a property. It can affect tenant demand, operating costs, valuation, lender appetite, insurance and exit options.

This article focuses on England and the use classes most relevant to residential accommodation, serviced accommodation and mixed-use shop-and-upper investments.

It is educational and is not planning, legal, tax or financial advice. The current lawful use, proposed use, planning history, local policies and exact operating model must be confirmed with the relevant Local Planning Authority (LPA) and a qualified planning professional.

What is a planning use class?

Planning use classes are set out mainly in the Town and Country Planning (Use Classes) Order 1987, as amended.

The Order groups similar uses together. A change within the same class may be treated differently from a change between classes. However, this does not mean that every change is automatically permitted.

A material change of use may still require planning permission. Other matters may also apply, including:

Planning conditions attached to an existing consent
Article 4 Directions
Restrictions in the title or lease
Building Regulations approval
Listed-building or conservation-area controls
Licensing requirements
Fire safety requirements
Freeholder, lender or insurer consent

The first step is to identify the property’s current lawful use. This may be established by an original planning permission, a later consent, a lawful development certificate, an established use or other planning evidence.

C1 : Hotels and similar accommodation

Class C1 covers:

Hotels
Boarding houses
Guest houses

The use must not include a significant element of care. Hostels are excluded from the Planning Portal’s description of C1.

A serviced-accommodation operation may raise a C1 question, but not every serviced-accommodation business is C1. The classification depends on the facts and the way the premises operate.

Relevant factors may include:

Guest turnover
Length and nature of stays
Whether guests have a permanent home elsewhere
The level of cleaning, reception and guest services
Whether the property is operated as a commercial accommodation business
The degree of management and supervision
The effect on neighbours, traffic and local amenity

There is no separate national “serviced accommodation” use class. The LPA may consider whether the operation remains within C3, operates more like C1, or falls within another use, including a sui generis use.

Do not assume that short-term letting is automatically permitted because the property is described as a flat or serviced apartment.

C2 : Residential institutions

Class C2 covers residential accommodation and care for people in need of care, where the use is not within C3.

Examples include:

Residential care homes
Nursing homes
Hospitals
Residential schools
Residential colleges
Training centres

C2 is not simply a label for a property occupied by vulnerable people. The care or institutional nature of the accommodation and its actual operation are important.

A planning assessment may consider:

The type of care provided
Whether care is available throughout the day or night
Staffing and supervision
Communal facilities
Management arrangements
The relationship between residents and the operator
Whether residents live as a household or receive institutional accommodation

Care regulation and planning are separate matters. A care provider may require registration or licensing even where the planning position appears clear.

C2A : Secure residential institutions

Class C2A covers secure residential accommodation, including:

Prisons
Young offender institutions
Detention centres
Secure training centres
Custody centres
Short-term holding centres
Secure hospitals
Secure local-authority accommodation
Military barracks

C2A is materially different from ordinary residential or care accommodation. Security, controlled access, staffing, management and the effect on the surrounding area are central considerations.

An investor should not treat C2A as an alternative description for ordinary C2 accommodation.

C3 : Dwellinghouses

Class C3 is the normal planning class for private houses and flats.

It includes:

C3(a): Use by a single person or by people living together as a single household, such as a family.
C3(b): Up to six people living together as a single household who receive care.
C3(c): Up to six people living together as a single household who do not fall within C4.

The exact facts remain important. A property’s physical layout does not, by itself, establish its lawful use.

C4 : Houses in multiple occupation

Class C4 covers a dwellinghouse occupied by between three and six unrelated individuals who share basic amenities, such as a kitchen or bathroom.

This normally relates to a small HMO where the occupiers use the property as their only or main residence.

More than six residents may fall outside C4 and may be treated as a sui generis use. The planning position should be checked before assuming that a larger HMO can operate under C4.

An Article 4 Direction may remove permitted development rights for a change from C3 to C4 in a defined area. Planning permission may then be required.

HMO licensing and planning are separate regimes. A property may need a licence even where planning permission is not required. Conversely, planning permission does not remove the need to comply with licensing requirements.

C1, C2, C2A, C3 and C4 compared

Class	Typical use	Operational characteristics	Common investor question	Planning warning
C1	Hotel, boarding house or guest house	Shorter stays and commercial accommodation services	Can the property operate as serviced accommodation?	Serviced accommodation is not automatically C1 or permitted
C2	Care home, hospital or residential college	Care, supervision or institutional management	Is the proposed care model genuinely C2?	Vulnerable occupants alone do not establish C2
C2A	Prison, secure hospital or detention centre	Secure occupation and controlled access	Is the use secure and institutional?	C2A is not ordinary care or residential use
C3	House or flat	A person, family or qualifying household	Is the property a lawful dwellinghouse?	Use, conditions and operating model must be verified
C4	Small HMO	Three to six unrelated residents sharing amenities	Can the property operate as a small HMO?	Article 4 and HMO licensing may apply

The practical differences

The main planning distinctions are:

Care versus household occupation: C2 and C3(b) involve care, but they are not interchangeable.
Temporary accommodation versus permanent residence: High guest turnover and hotel-style services may point away from ordinary C3 use.
Household versus unrelated sharers: C3 and C4 depend on how people live together.
Secure versus non-secure accommodation: C2A involves security and controlled institutional use.
Intensity and local impact: Noise, traffic, waste, parking, communal facilities and management may influence whether a use is material.

C2 to C3 and C3 to C2

There is no universal automatic right to change every C2 property to C3, or every C3 property to C2.

Planning permission, a permitted-development route or prior approval may be relevant. The correct route depends on:

The existing lawful use
The proposed use
The current General Permitted Development Order
Local restrictions
Article 4 Directions
Planning conditions
The building and operating model

Class MA is not a general C2 route. It is a permitted-development route from qualifying Class E commercial, business and service uses to C3 dwellinghouses, subject to statutory conditions and prior approval. See the Class MA legislation.

The Planning Portal prior approval guidance explains that permitted-development rights may still require the LPA to assess specified matters.

Serviced accommodation and the London 90-night rule

Serviced accommodation has no dedicated use class. A proposed operation must be assessed by reference to the actual facts.

Short-term bookings, frequent guest turnover, hotel-style services and commercial management may create a material-change-of-use issue. The correct classification may depend on the scale and operation of the business.

In London, the 90-night restriction is a separate rule relating to short-term letting of residential premises. It does not decide the property’s planning use class and should not be treated as a general permission to operate serviced accommodation.

Check the local authority position before acquisition, especially where the business model depends on regular short stays.

Mixed-use shop-and-upper examples

Class E shop with a conventional C3 flat above: Verify the separate lawful uses, access arrangements, title, lease and any shared services.
Existing C3 flat proposed as a small HMO: Assess whether the use falls within C4, whether an Article 4 Direction applies and whether HMO licensing is required.
Former commercial or institutional upper floors proposed as flats: Confirm the current lawful use. Class MA may be relevant only where the starting use is qualifying Class E and all statutory requirements are met. Otherwise, full planning permission or another route may be required.
C2 care accommodation above a shop: Review the operator, care provision, fire separation, access, staffing, planning position and licensing. Do not assume that the space can become C3 flats.

Planning and due-diligence checklist

Before exchange, review:

Title, leases, covenants and landlord consent.
Planning history and existing planning conditions.
The current lawful use of each part of the building.
Enforcement notices, investigations and unresolved breaches.
Article 4 Directions and local planning policies.
Conservation-area and listed-building restrictions.
Building Regulations and fire-safety requirements.
Licensing and care-regulation requirements.
EPC and Minimum Energy Efficiency Standards (MEES).
Parking, highways, waste and servicing arrangements.
Contamination, flooding and environmental constraints.
Lender, insurer and freeholder requirements.

This process supports disciplined commercial property investment in the UK, particularly where an upper-floor conversion or change in operating model is part of the strategy.

Value and investment impact

Lawful use can affect:

Rent and tenant demand
Operating costs
Valuation
Lender appetite
Insurance
Refinance options
Exit value

GDV is not the same as investment value. No GDV should be quantified without a confirmed scheme, planning consent or route, construction costs, professional fees, market evidence and an appropriate valuation.

The proposed ownership structure also requires separate advice. A limited company and an LLP may have different accounting, tax, financing and reporting consequences. Capital allowances may be relevant to qualifying fixtures in some commercial property transactions. Tax-advantaged property investment strategies, including pension-based structures, require advice from qualified tax and financial professionals and must be assessed against the property’s use and the investor’s circumstances.

Realty Packaging’s Four Pillars

Realty Packaging reviews mixed-use and commercial property development projects through four areas:

Lease: occupational terms, landlord obligations and restrictions.
Planning: lawful use, proposed use, consent routes and local controls.
Building condition: structure, services, fire separation and conversion requirements.
Operational compliance: licensing, safety, management and ongoing obligations.

These checks help investors assess risk before committing capital to a high-yield commercial property opportunity or wider property portfolio growth strategy.

Investor checklist

Before exchange:

Identify the existing lawful use.
Define the proposed use and operating model.
Obtain advice from a qualified planning professional.
Confirm whether planning permission, prior approval or another consent route applies.
Check Article 4 Directions and local restrictions.
Review leases, title restrictions and lender requirements.
Budget for works, professional fees, licensing and compliance.
Obtain written confirmation where the planning position is material to the investment.

Official sources

Conclusion

C1, C2, C2A, C3 and C4 describe different uses. The correct class depends on the lawful use and the way the property operates.

Investors should not rely on a listing description, estate-agent wording or an assumed permitted-development right. Confirm the planning position before exchange and align the proposed use with the title, lease, building, licensing and funding requirements.

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