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Higher-risk building control affects a mixed-use development whenever the building meets the statutory use test and either the height or storey threshold; shops and offices do not create an automatic exemption. In England, a building is generally in scope for design-and-construction control if it is at least 18 metres high or has at least seven storeys and contains at least two residential units, a care home or a hospital, unless a specified exclusion applies. The Building Safety Regulator (BSR) must approve covered work before it starts. The difficult questions are usually which connected parts count as one building, whether a section is independent, and which authority controls each building in a mixed scheme.
This article concerns the England design-and-construction regime. It is separate from the occupation-phase higher-risk building regime and from the definition of a relevant building used for leaseholder protections.
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What does higher-risk building control mean for a mixed-use project?
It means the project must pass a legal scope test before the client chooses a building-control route. If a qualifying building is in scope, the client must obtain BSR building-control approval before covered work begins, submit detailed safety and dutyholder information, manage changes through the approved process and obtain a completion certificate. Starting work without required approval is a criminal offence.
A development can contain retail, offices, restaurants, parking and homes and still be one higher-risk building. The commercial floors are not automatically removed from the regime. Conversely, not every mixed-use scheme is higher-risk: the qualifying use, height or storey threshold, building boundary and exclusions all have to be considered together.
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The BSR’s official guidance states that buildings proposed to be mixed-use buildings are subject to the requirements of the higher-risk regime
. That is a scope warning, not a conclusion that every mixed-use design qualifies.
How do you test whether a mixed-use building is higher-risk?
Apply the tests in this order: define the building, identify qualifying use, check either threshold and then test exclusions. The height and storey tests are alternatives; meeting both is not required.
| Question | What to establish |
|---|---|
| What is the building? | Decide whether connected towers, podiums, basements and shared spaces form one building or independent sections under the statutory definition. |
| Does it contain qualifying use? | At least two residential units, a care home or a hospital. Residential units can include flats, studio flats, HMOs, university shared accommodation and supported or sheltered accommodation. |
| Does it meet a threshold? | At least 18 metres high or at least seven storeys, using the prescribed measurement and counting rules. |
| Is an exclusion applicable? | Check the specified exclusions, including buildings used entirely as a secure residential institution, hotel or military barracks and certain Ministry of Defence or other military accommodation. |
The official new-building criteria and existing-building criteria should be read with the regulations for the project’s facts. A hotel exclusion is not a general mixed-use exclusion: the guidance describes the excluded category as a building comprising entirely of the relevant use. A hotel over shops and flats therefore needs a fresh analysis rather than an assumption that the whole building is exempt.
Does commercial space count inside a higher-risk building?
Usually, yes. A shop, office, café or other commercial area inside the qualifying building remains part of the building unless the statutory analysis shows that it is an independent section or a separately defined building. A shopping centre containing at least two residential units can therefore be in scope when it reaches 18 metres or seven storeys.
Use the residential-unit test rather than a percentage-of-floor-area test. Two flats above a large retail podium can be enough if the building boundary and threshold tests are met. The same principle can capture boarding accommodation, university accommodation and supported accommodation where the units are living accommodation.
Keep the two regimes separate in project records. This article addresses approval of design and construction work. Registration and duties during occupation are additional requirements, not a substitute for building-control approval.
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Which parts of a connected development are one building?
There is no reliable answer from a site plan or a shared façade alone. The team must apply the statutory building definition, examine the structure and determine whether a part is an independent section. The BSR’s examples focus on entrances and exits, access between sections and whether the connection runs through residential or non-residential space.
- Commercial room in a tower: a café on an upper floor was treated as part of the tower where it relied on the tower for escape and could not reasonably be considered an independent section.
- Two towers with a party wall and basement car park: each can be an independent building where each has its own external entrance and exit and the connection is to a non-residential section.
- Residential connections: towers linked by access to other residential sections, including a walkway without independent outside egress, may be treated together as one building.
- Lower adjoining tower: it may be separately defined yet fail the height or storey threshold when assessed on its own.
These are illustrations, not automatic legal outcomes. Record the entrances, escape routes, structural interfaces, fire compartments, shared services and access arrangements on the drawings used for the scope decision. For an unusual podium, atrium, bridge or phased tower arrangement, obtain competent building-control advice and, where necessary, legal advice.
Who controls a mixed project containing higher-risk and ordinary buildings?
The usual arrangement splits control: BSR controls the higher-risk buildings, while the local authority or a registered building control approver controls non-higher-risk buildings. In limited circumstances BSR may agree to control both types, but that requires a request and BSR assessment; it is not an entitlement.
A single BSR application can cover a multiple-tower project where higher-risk buildings connect through a shared podium or common part such as a car park, walkway or party wall. The guidance recommends contacting BSR before submitting a staged application for a multiple-tower project. Do not assume that one planning permission or one contractor package creates one building-control application.
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|---|---|---|
| Qualifying higher-risk building | BSR building-control approval | Scope decision, dutyholders, application documents and approval before work. |
| Non-higher-risk building in the same development | Local authority or registered building control approver | Separate submission and interface responsibilities. |
| Multiple connected towers or shared podium | Potentially one BSR application or a staged arrangement | Building boundaries and BSR’s agreement to the proposed route. |
What must the client do before work starts?
The client remains legally responsible even when an agent prepares or submits the application. The client must ensure the information is accurate, appoint competent dutyholders, provide the required plans and strategies, and ensure that no covered work starts before approval.
- Freeze the scope assessment. Document the building boundary, qualifying uses, residential-unit count, height and storey count, and any exclusion considered.
- Map control responsibility. Identify every higher-risk and non-higher-risk building, including shared podiums, basements and access links. Confirm whether BSR, a local authority or a registered approver controls each element.
- Appoint dutyholders and an agent if useful. An agent can manage correspondence, but cannot take away the client’s legal responsibility.
- Prepare coordinated information. Assemble location details, client and dutyholder details, drawings and plans, a work description, estimated build time and the post-work count of residential and non-residential units.
- Complete the required strategies and declarations. Depending on the work, this includes change-control and construction-control plans, competence declarations, a fire and emergency file, a mandatory-occurrence-reporting plan and, where relevant, a partial-completion strategy.
- Submit and wait for the decision. The application must be approved before covered work begins. A contractor’s mobilisation date is not permission to start.
The BSR application guidance sets out the information and supporting documents. Requirements vary with the building and work category, so use the current form and guidance rather than an old submission checklist.
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How long does BSR approval take?
BSR states assessment periods of up to 12 weeks for a new higher-risk building application and up to eight weeks for work to an existing higher-risk building, unless an extension is agreed. Those are assessment periods, not a promise of total project duration. Application quality, project complexity, requests for clarification and agreed extensions can change the programme.
Build the review period into procurement and financing dates. Submit coordinated information early enough to resolve queries without redesigning the construction sequence. Do not use an unapproved staged package as a workaround for the prohibition on starting work.
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Some work to an existing higher-risk building is exempt or may be carried out under a competent-person scheme. That does not remove it from the project application when it forms part of a wider project. Determine the work category at the outset.
Category A work includes changes to external height or width, storey count, internal layout, residential-unit count, passive or active fire-safety measures, escape routes or common parts. Work that does not meet a Category A criterion is generally Category B. The category affects the information and change-control approach, so describe interfaces with the existing structure and occupied areas precisely.
For example, converting offices to flats can alter the residential-unit count, internal layout, escape routes and fire measures at the same time. Treat those changes as a scope issue, not merely an internal fit-out question. If exempt work is combined with Category A work, include the combined project information in the application.
How do completion and occupation requirements differ?
After the approved work is complete, apply for a completion certificate. A qualifying higher-risk building containing at least two residential units must also be registered with BSR before people live there. Registration is an occupation-phase gate and does not replace the construction approval or completion certificate.
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Plan handover evidence throughout construction: approved drawings, controlled changes, fire and emergency information, mandatory-occurrence-reporting arrangements and records needed for the completion application. A late decision about which tower or shared space is in scope can leave the completion package incomplete.
What are the most common mixed-use scope mistakes?
- Assuming retail use is a carve-out. Commercial floors remain in the building unless the legal boundary analysis separates them.
- Applying both thresholds as a test. Eighteen metres or seven storeys is sufficient; requiring both can wrongly exclude a building.
- Counting floors without checking the prescribed rules. Storey and height measurements must follow the applicable guidance, not a marketing description of the building.
- Treating a hotel exclusion as universal. The relevant exclusion is for a building used entirely as the excluded use; a mixed building needs separate analysis.
- Assuming a shared podium always unifies towers. Entrances, exits, access and the nature of the connection determine whether sections are independent.
- Using a planning or fire strategy as the building-control decision. Those documents inform the assessment but do not determine the statutory building boundary by themselves.
- Starting enabling or demolition work too early. If the work is covered, BSR approval must precede the start; confirm whether apparently minor work is part of the approved project.
- Leaving unit counts until the end. The application requires residential and non-residential unit counts after the work, and a change can affect scope.
How should a project team document its decision?
Create a scope memorandum that can be read by the client, designers, contractors and each building-control body. Include a labelled plan showing proposed building boundaries; a schedule of residential, care, hospital and commercial uses; height and storey calculations; exclusions considered; entrances, exits and shared access; structural and fire-separation interfaces; and the proposed authority for each element.
For each conclusion, cite the applicable BSR guidance and identify assumptions that could change during design. Revisit the memorandum when a tower is linked, a podium is extended, a dwelling is added or removed, a circulation route changes, or a phased-completion strategy is introduced. A documented reassessment is safer than relying on an early informal view.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should clients ask before appointing the design-and-build team?
- Which legal building definition has been applied to every tower, podium, basement and bridge?
- What evidence supports the height and storey measurements?
- How many residential units exist after the work, and do any care, hospital or supported-accommodation uses apply?
- Which exclusions were considered, and why do they apply or not apply?
- Which authority will control each building, and has BSR agreed to any proposed combined or staged route?
- Who owns the application, change-control plan, mandatory-occurrence-reporting plan and fire and emergency file?
- What is the programme allowance for the stated BSR assessment period and possible queries?
- How will partial completion, handover and residential registration be coordinated?
What is the practical effect on mixed-use design and programme?
The regime makes the interfaces between uses and structures a primary design-management issue. Teams need earlier agreement on building boundaries, unit counts, fire and escape strategies, dutyholder competence and change control. A commercial tenant’s layout can affect a residential escape route; a shared car park can affect the building-control application structure; and a late decision to connect towers can alter the authority, documents and programme.
The result is not a ban on mixed use. It is a requirement to identify the qualifying building correctly, obtain the right approval and maintain a controlled record from design through completion. Treat the scope decision as a live project deliverable, not a one-line assumption in the planning statement.
Official guidance and legal context
Use the BSR pages on building-control approval for higher-risk buildings, existing-building criteria, new-building criteria and application information alongside the applicable regulations. The Explanatory Memorandum to the Building (Higher-Risk Buildings Procedures) (England) Regulations 2023 provides legislative context. All guidance and timings should be checked against the current version for the project date and facts.
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Frequently Asked Questions
Can a mixed-use building be higher-risk if it has only two flats?
Yes, two residential units can satisfy the qualifying-use limb if the legally defined building reaches at least 18 metres or seven storeys and no exclusion applies. The size of the commercial area does not cancel that test.
Does a shared basement car park automatically make separate towers one building?
No. Official examples show that towers can remain independent buildings where each has its own external entrance and exit and the connection is to a non-residential section. Access through residential sections or a lack of independent egress can lead to a different conclusion.
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Can work begin while BSR is still reviewing the application?
No. Covered work on a higher-risk building must wait for BSR approval. The stated eight- or 12-week periods are assessment targets that may be extended and do not authorise early mobilisation.
Are university or supported-accommodation rooms treated as residential units?
They can be. The guidance identifies university shared accommodation and supported or sheltered accommodation as examples of living accommodation that may count, so the operator’s label alone is not decisive.
Is BSR registration needed for a mixed-use building with no homes?
The registration requirement described here applies to a qualifying higher-risk building with at least two residential units before people live there. A wholly commercial building may still have other building-control obligations, but this residential registration gate would not apply on that fact alone.
