An empty or underused office can look like an obvious candidate for hotel conversion. The building already exists, much of the external envelope may remain, and the floor area can potentially be reorganised into bedrooms, circulation and guest facilities.
But converting an office into a hotel is not simply an internal refurbishment.
In England, offices and hotels sit within different planning use classes. The change also creates a different Building Regulations risk profile because people will be sleeping in a building previously designed primarily for daytime commercial occupation.
Before committing to a conversion, the project therefore needs to answer three separate questions: is hotel use acceptable in planning terms, can the existing building be adapted technically, and what upgrades are required for Building Regulations and fire safety?
AC Design Solution has dealt with these issues directly. At 2–4 Mill Street in Luton, the former Job Centre was converted into an 87-bedroom hotel, with AC Design Solution responsible for the Building Regulation drawings and civil engineering design.
Does Converting an Office Into a Hotel Need Planning Permission?
In most cases, the planning use needs to be addressed because an office and a hotel do not fall within the same use class.
In England, an office used for operational or administrative functions falls within Class E(g)(i) of the current Commercial, Business and Service use class. Hotels, boarding houses and guest houses where no significant element of care is provided fall within Class C1.
The Planning Portal guidance on change of use explains that changing from one use class to another will generally require planning permission unless a specific permitted development right applies.
That means an office-to-hotel proposal should not be treated as though the existing commercial use automatically covers hotel accommodation.
The lawful existing use should be established first, followed by a review of the relevant planning policy and any site-specific restrictions.
Class E and Class C1: Why the Difference Matters
The Use Classes Order groups uses that have broadly similar planning characteristics.
Class E is wide. It includes shops, restaurants, certain services, offices, indoor sport and several other commercial and community-facing activities. Moving between uses that genuinely remain within Class E may not constitute development for planning purposes.
A hotel is different.
Hotel use falls within Class C1 and introduces overnight occupation, guest arrivals and departures, servicing, housekeeping, potentially food and beverage operations and a different relationship with neighbouring properties.
The planning authority can therefore consider whether the proposed hotel is appropriate for the location rather than simply accepting it as another Class E business.
The current Use Classes Order sets out the relevant classifications.
Do Permitted Development Rights Allow an Office to Become a Hotel?
Do not assume that the permitted development rules used for some other commercial conversions automatically apply to hotels.
For example, Class MA provides a route, subject to its requirements and prior approval, for certain Class E buildings to change to Class C3 dwellinghouses. That is a commercial-to-residential permitted development route. It is not an office-to-hotel route.
The General Permitted Development Order contains a number of specific change-of-use rights, but each has its own starting use, destination use, limitations and conditions.
The planning route should therefore be checked against the actual existing and proposed uses rather than assuming that because one type of commercial conversion can use permitted development, a hotel conversion can do the same.
What Will the Council Consider in an Office-to-Hotel Planning Application?
The exact assessment depends on the local development plan, the building and its location.
One of the first questions may be whether the loss of the existing office or employment floorspace is acceptable. Local policies can protect employment uses in particular locations, while other areas may support visitor accommodation where it contributes to the local economy.
The council may also consider how the hotel would operate.
A hotel can generate different patterns of movement from an office. Guests can arrive in the evening, taxis and private-hire vehicles may need somewhere to stop, deliveries and laundry services require access, and refuse storage can be greater than for a conventional office.
Noise and neighbouring amenity can also become important, particularly where a commercial building sits close to homes.
If external changes are proposed for new entrances, windows, plant, extraction equipment, rooftop services, signage or other alterations, these may form part of the planning assessment as well.
For listed buildings or buildings within Conservation Areas, heritage considerations can introduce another layer of control.
Check the Existing Building Before Designing the Bedrooms
A hotel layout should not be developed purely by dividing an office floor plate into as many bedrooms as possible.
Existing buildings come with structural grids, columns, cores, stairs, floor-to-floor heights, drainage positions, windows and service routes that influence what can realistically be achieved.
A bedroom layout that appears efficient on plan may become much less efficient once bathrooms, soil stacks, ventilation, risers, fire compartments and accessible circulation are coordinated.
The existing structure matters too.
New openings may be required through walls or floors. Existing stairs may need alteration. Plant loads may change. New service penetrations can affect structural and fire-resisting elements.
This is where architectural planning and structural engineering need to be coordinated rather than developed as separate exercises.
An Office-to-Hotel Conversion Is a Material Change of Use Under Building Regulations
Planning change of use and Building Regulations material change of use are related concepts, but they are not the same legal test.
Regulation 5 of the Building Regulations 2010 expressly identifies a material change of use where, after the change, a building is used as a hotel or boarding house where it was not used that way previously.
That is particularly important for an office-to-hotel project.
It means the Building Regulations assessment is not limited to whichever new walls or bathrooms are physically being installed. Regulation 6 requires work to be carried out where necessary so that the building satisfies the applicable requirements associated with the material change of use.
A hotel conversion therefore needs a coordinated technical review of the existing building rather than treating the work as a cosmetic fit-out.
Fire Safety Becomes a Major Design Issue
The change from office occupation to sleeping accommodation fundamentally changes the fire-safety context.
People working in an office are generally awake, familiar with their surroundings and able to respond quickly to an alarm.
Hotel guests may be asleep, unfamiliar with the building and unaware of alternative escape routes.
That difference influences the fire strategy.
The technical design may need to consider escape routes, travel distances, protected stairs, compartmentation, fire-resisting construction, doors, alarm and detection systems, penetrations through fire-resisting elements, emergency lighting, firefighting access and other project-specific measures.
For buildings other than dwellings, the current statutory guidance is Approved Document B, Volume 2. The government updated the Approved Document B collection in September 2026, so the edition and transitional provisions relevant to the actual project should be checked when the technical package is prepared.
The design-stage Building Regulations requirements are also separate from the operational fire-safety duties that apply once the hotel is in use.
The Home Office publishes specific fire-safety risk-assessment guidance for sleeping accommodation covering hotels and other premises where guests sleep.
Existing Stairs and Escape Routes Need Early Review
An office staircase cannot simply be assumed to provide an acceptable escape strategy for a hotel because it served the previous commercial use.
The number and position of stairs, travel distances, final exits, compartmentation and the relationship between bedrooms and escape routes need to be assessed for the proposed use.
This is one reason fire strategy should influence the floor plan early.
If dozens of hotel rooms are designed before the escape strategy is established, a later fire-safety review can force substantial changes to room numbers, corridors, doors and circulation.
On a conversion project, the most efficient bedroom arrangement is the one that works with the building’s structural and fire-safety constraints rather than fighting against them.
Accessibility Is Part of the Conversion Strategy
Access should also be reviewed early.
A building designed as an office may have existing lifts, entrances and circulation, but that does not automatically mean the proposed hotel arrangement will satisfy the applicable requirements.
The design may need to consider the approach to the building, entrance thresholds, reception, circulation, lifts, sanitary facilities and accessible guest accommodation in the context of the proposed work.
The relevant statutory guidance for buildings other than dwellings is Approved Document M, Volume 2.
Existing-building constraints can make accessibility particularly challenging, which is another reason feasibility should be undertaken before the room schedule and commercial model are fixed.
Drainage Can Determine Whether a Hotel Layout Is Practical
An office may have relatively few toilets concentrated around one or two service cores.
A hotel can introduce a bathroom to almost every bedroom.
That is a major change to the drainage demand and distribution.
The design needs to consider soil stacks, horizontal drainage runs, falls, connection points, penetrations through existing floors, access for maintenance and the capacity and condition of the existing drainage system.
Trying to resolve drainage after every bedroom has been positioned can result in awkward bulkheads, excessive service runs or layouts that need to be redesigned.
Stacking bathrooms vertically and coordinating them with existing drainage can make a significant difference to the practicality of a conversion.
This was one of the technical areas relevant to AC Design Solution’s work at 2–4 Mill Street, where the conversion involved both Building Regulations and civil engineering challenges.
Ventilation, Heating and Building Services Need More Space Than the Planning Plan Suggests
Hotel rooms need more than walls, beds and bathrooms.
Ventilation, heating, cooling where proposed, hot-water distribution, electrical systems, fire alarms, lighting, data, drainage and other services need routes through the existing building.
That can create pressure on ceiling voids and risers, particularly in older commercial buildings with limited floor-to-floor height.
Plant location also matters.
Rooftop or external mechanical equipment can introduce planning considerations relating to appearance and noise, while internal plant rooms consume floor area that may otherwise have been assumed to be available for bedrooms.
A successful feasibility study should therefore reserve realistic space for building services rather than maximising the room count first and asking the services to fit afterwards.
Acoustic Separation Matters in Hotel Design
An office can tolerate a very different acoustic environment from a hotel.
Guests expect privacy between bedrooms and protection from noise generated by corridors, lifts, plant and other parts of the building.
The proposed construction therefore needs to consider the applicable acoustic requirements alongside the operational expectations of a hotel.
Existing floors and partitions should not be assumed to provide suitable separation simply because they were adequate for the office use.
Acoustic upgrades can also affect floor and wall thicknesses, ceiling zones and junction details, so they should be coordinated with the architectural and services design.
Structural Alterations Should Follow the Existing Load Paths
Commercial buildings can appear flexible because their floor plates are often relatively open.
But the existing structural system still controls what can be altered.
Columns, beams, slabs, load-bearing walls and cores may restrict bedroom positions or new openings. Cutting a new service penetration through a slab or creating a larger opening is not simply an architectural decision.
Where structural alterations are required, calculations and drawings need to establish how loads will be supported and transferred safely.
AC Design Solution provides structural calculations and drawings for alterations requiring engineering input.
The structural design should also be coordinated with fire protection, because beams, columns and other structural elements may form part of the building’s required fire-resisting construction.
Real Project: 2–4 Mill Street, Luton
AC Design Solution’s 2–4 Mill Street hotel conversion provides a direct example of the technical work involved in adapting an existing commercial building for hotel use.
The property was the former Job Centre in Luton.
The developer’s proposal was to transform the existing building into an 87-bedroom hotel.
AC Design Solution did not lead the planning application for the project. The appointment focused on Building Regulation drawings and civil engineering design, providing the technical information needed to develop the conversion and address Building Control requirements.
That distinction matters.
Planning permission establishes whether hotel use and the associated development are acceptable from a planning perspective. It does not resolve the construction details required to turn an existing commercial building into safe sleeping accommodation.
For Mill Street, the technical work had to respond to the existing structure, drainage and the Building Regulations requirements associated with the new hotel use.
The project demonstrates why conversion feasibility needs to extend beyond the planning drawings.
Planning Drawings and Building Regulation Drawings Have Different Jobs
For an office-to-hotel conversion, the planning submission may establish the proposed use, external alterations and overall layout.
The Building Regulation package goes much further.
It needs to communicate how the relevant construction will work technically, including matters such as fire safety, structure, ventilation, drainage, accessibility, thermal performance and other applicable requirements.
AC Design Solution’s Building Regulation Drawings service covers technical drawing packages for conversion and alteration projects.
The difference is important because obtaining planning permission should not be treated as confirmation that the approved hotel layout is already ready for construction.
When Should Building Regulations Work Start?
Ideally, technical feasibility should influence the planning design before the planning application is submitted.
That does not necessarily mean completing every construction detail before planning permission is secured.
It means identifying the constraints that could materially affect the planning layout.
For a hotel conversion, those constraints can include fire escape, structural grids, drainage, vertical service routes, accessible circulation and plant.
If those issues are ignored until after planning permission, the Building Regulations design may require changes that affect the approved layout.
Early coordination reduces that risk.
Frequently Asked Questions
Can an office be converted into a hotel?
Yes, subject to planning, Building Regulations and the suitability of the existing building. The feasibility assessment should consider the lawful existing use, local planning policy, structure, fire safety, drainage, accessibility and building services before the hotel layout is fixed.
What use class is a hotel in England?
Hotels, boarding houses and guest houses where no significant element of care is provided fall within Use Class C1.
What use class is an office?
An office used to carry out operational or administrative functions falls within Class E(g)(i) in England.
Can Class MA be used to convert an office into a hotel?
No. Class MA concerns qualifying changes from Class E to Class C3 dwellinghouses. A hotel is Class C1, so the Class MA commercial-to-residential route should not be confused with an office-to-hotel conversion.
Does an office-to-hotel conversion need Building Regulations approval?
The Building Regulations 2010 expressly treat a building becoming a hotel where it was not one previously as a material change of use. The applicable requirements therefore need to be assessed and any necessary work carried out.
Is planning permission enough to start converting the building?
No. Planning permission and Building Regulations deal with different issues. A project may also require structural design, fire strategy, building-services coordination and other technical information before construction can proceed safely.
Does an existing office staircase automatically work for a hotel?
Not necessarily. The proposed escape strategy needs to be assessed for the new sleeping use, including the relevant travel distances, protected routes, exits and fire-safety provisions.
Why is drainage so important in an office-to-hotel conversion?
An office may have a small number of toilets concentrated around existing cores, while a hotel may introduce bathrooms to dozens of bedrooms. The resulting drainage arrangement can have a major influence on room layouts, floor penetrations and service routes.
Planning an Office-to-Hotel Conversion
The opportunity in an existing commercial building is not defined only by its total floor area.
A successful hotel conversion depends on how effectively the planning use, room layout, fire strategy, structure, drainage, accessibility and building services can be coordinated within the existing fabric.
The former Job Centre at 2–4 Mill Street demonstrates that an existing commercial building can be adapted for a very different use, but doing so requires detailed technical work beyond the initial concept.
AC Design Solution provides architectural and technical coordination, structural engineering and Building Regulation Drawings for conversion and alteration projects.
To discuss an existing commercial building or proposed conversion, contact AC Design Solution.
