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Change of use specialists – C3 to sui generis (short‑term lets over 90 nights)

London’s housing and visitor economy are changing fast. Turning a C3 dwelling into short‑term visitor accommodation—especially where lettings exceed 90 nights per calendar year—now sits firmly in the planning spotlight and is usually treated as sui generis use. That means full planning permission, careful justification, and a clear strategy.

Planning World specialises in navigating this shift from C3 to sui generis, helping landlords, investors and hosts secure lawful, sustainable short‑term letting arrangements.

Understanding change of use – from C3 dwellinghouse to sui generis

C3 dwellinghouses

Standard residential use: A self‑contained home occupied by a single household.
Planning baseline: Most London boroughs protect C3 stock to safeguard long‑term housing supply.

Sui generis short‑term visitor accommodation

Whole‑unit short‑term lets: Letting an entire flat or house to visitors rather than a permanent resident.
Over 90 nights per year: In London, exceeding 90 nights per calendar year typically triggers a material change of use, moving the property out of C3 and into sui generis.
Always needs permission: Changes to or from sui generis are not covered by permitted development rights and require a full planning application.

Local planning authorities will look closely at:

Loss of residential accommodation
Impact on neighbours (noise, comings and goings, security)
Management arrangements and guest behaviour
Access, refuse, servicing and safety

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What are most change of use applications in London for?

Commercial to residential (Class E to C3 via Class MA prior approval) Offices, shops and other Class E premises being converted into flats to meet housing demand.
C3 to HMOs and large HMOs (sui generis)
- Small HMOs (C4) for 3–6 occupiers, often via permitted development where Article 4 Directions do not apply.
- Large HMOs (7+ occupiers) are sui generis and always require full planning permission—similar in principle to large short‑term letting operations.
Retail and commercial to food, leisure and night‑time uses (often sui generis) Pubs, takeaways, nightclubs and other sui generis uses remain tightly controlled because of amenity and transport impacts.

Short‑term visitor accommodation over 90 nights per year sits within this wider pattern of intensification and diversification of residential and commercial stock, and London boroughs are increasingly cautious about uncontrolled growth in this sector.

Key issues for C3 to sui generis short‑term lets (over 90 nights)

1. Material change of use

Threshold: Letting a C3 dwelling for more than 90 nights per calendar year is generally treated as a material change of use to short‑term visitor accommodation.
Planning consequence: A full change‑of‑use application is required; operating without permission risks enforcement action.

2. Amenity and neighbour impact

Noise and disturbance: Frequent arrivals and departures, luggage, late‑night activity.
Security and privacy: Regular turnover of guests can worry neighbours and freeholders.
Management plans: Councils expect robust guest rules, contact details, and complaint procedures.

3. Housing policy and loss of C3 stock

Housing supply: Many boroughs resist permanent loss of C3 units to visitor accommodation.
Policy tests: Applications must address local plan policies on housing, visitor accommodation and town centre uses.

4. Design, access and safety

Fire safety and means of escape
Refuse and recycling storage
Access, parking and servicing

Even where no external works are proposed, these matters are assessed as part of the planning balance.

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How Planning World can help

Specialist change‑of‑use advice

Use class appraisal: We confirm whether your current and proposed use fall within C3, C4 or sui generis, and whether the 90‑night threshold is engaged.
Policy review: Borough‑specific analysis of housing, visitor accommodation and amenity policies, including any Article 4 Directions or local restrictions.

Planning strategy for short‑term lets

Feasibility assessment: Clear advice on prospects of securing permission for C3 to sui generis short‑term visitor accommodation.
Risk management: Identification of enforcement risks and options to regularise existing use or adjust operations.

Preparation and submission of applications

Planning statements: Robust justification addressing housing supply, amenity, transport, and management arrangements.
Management plans: Guest rules, booking controls, cleaning schedules and neighbour liaison measures tailored to local concerns.
Liaison with the council: We handle negotiations with planning officers, respond to consultation comments and, where necessary, manage appeals.

Support across wider change‑of‑use categories

Alongside C3 to sui generis short‑term lets, Planning World advises on:

Commercial to residential (Class E to C3, including Class MA prior approval)
C3 to HMOs (C4 and large sui generis HMOs)
Retail, leisure and night‑time economy changes, including sui generis uses

This broader experience in London’s change‑of‑use landscape allows us to position your proposal within current trends and policy priorities.

Next steps

If you are:

Letting a London flat or house for more than 90 nights per year,
Considering a move from standard residential use (C3) to short‑term visitor accommodation, or
Looking to regularise an existing short‑term letting operation,

Planning World can provide clear, practical advice and manage the entire change‑of‑use process for you.

Get in touch today to discuss your property, and we’ll help you understand the planning position, your options, and the best route to a lawful, sustainable short‑term letting use.

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Get in touch today

to discuss your property, and we’ll help you understand the planning position, your options, and the best route to a lawful, sustainable short‑term letting use.

Get in touch today

to discuss your property, and we’ll help you understand the planning position, your options, and the best route to a lawful, sustainable short‑term letting use.