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Refurbishing a London office tower may require planning permission, building-regulations approval and, for some buildings, Building Safety Regulator approval—but there is no single permit checklist that applies to every tower. The route depends on the address, planning history, proposed work, heritage status, building uses and construction logistics. Listed building consent, assessments, Party Wall Act notices, asbestos surveys, CDM duties or a highway licence may also apply. Confirm the requirements with the relevant local planning authority and the project’s competent design, building-control and safety advisers before work begins.
Why can’t you use one London-wide permit checklist?
Different approvals regulate different things, and more than one can apply to the same project. Planning permission is about whether development is acceptable at that location; building regulations address building performance and safety. Heritage consent, construction-safety duties, neighbour notices and highway licences are separate again. Obtaining one does not automatically satisfy the others.
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There is also no address or scope of work specified here, so no source can establish exactly which applications a particular tower needs. A pure office building, a listed tower, a mixed-use tower and a building beside a busy highway can have materially different approval routes even if each is tall. Treat the requirements below as a project triage, then check them against the site and work schedule.
When does a tower refurbishment need planning permission?
Planning permission may be needed for building work that amounts to development, some demolition, or a change of use. The local planning authority assesses the proposal in the context of its location, planning history, policies and any site-specific restrictions. External changes can raise issues such as appearance, massing, protected views and effects on neighbours; internal work may also be relevant if it involves a change of use or other development requiring permission.
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Do not assume that permitted development rights apply to the project. Their availability and scope can be affected by the building, location, planning history, conditions or restrictions. Even where a proposal is permitted development, that does not waive building regulations or other consent requirements. If it is unclear whether permission is required, the local planning authority can issue a lawful development certificate—a legally binding decision on the proposal’s lawfulness. See the government’s guidance on when planning permission is required.
Start with the correct authority for the building’s address, then obtain the planning history and identify any existing conditions, obligations or restrictions that may affect the proposed work. London has multiple planning authorities: guidance from the City of London Corporation is an example for sites in its area, not a checklist that automatically applies across every borough.
What supporting evidence might a major planning application need?
A major application may need a package of supporting documents, selected to fit the site and the likely effects of the proposal. The City of London Corporation’s major-applications guidance lists possible material including design and access statements, local or strategic view assessments, daylight and sunlight analysis, energy, transport and servicing information, and sustainability material.
Depending on the site and impacts, the evidence may also address flood risk, ecology, archaeology, noise or pollution, waste and servicing. An environmental statement may be needed where significant effects are likely; archaeology may be relevant where groundworks affect a site with archaeological potential. The authority may also identify planning or highways legal agreements as part of the process.
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These are possibilities, not a universal bundle. Ask the actual authority for its current validation requirements and establish early which assessments are proportionate to the proposal. Incomplete or mismatched submissions can create avoidable delay, while commissioning every possible study without regard to the site can waste time and money.
Does a listed or conservation-area tower need heritage consent?
If the building is listed, alterations, demolition or extensions may require listed building consent from the local planning authority. That can include internal work as well as conspicuous exterior changes. The City of London’s Heritage Building Retrofit Toolkit gives examples such as replacing windows or doors, removing internal walls, painting over brickwork and altering fireplaces. Whether a particular intervention needs consent depends on the building and the effect on its special interest.
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Heritage designation does not itself remove the need to meet building regulations. Historic England’s building-regulations guidance notes that listed buildings and buildings in conservation areas are not exempt. The design team therefore needs to coordinate heritage considerations with the applicable safety and performance requirements, rather than treating one approval as a substitute for the other.
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Does a tall office tower need Building Safety Regulator approval?
Not solely because it is tall. Under the current England guidance, the higher-risk building (HRB) test for Building Safety Regulator building control combines a height or storey threshold with a specified use. A building must be at least 18 metres high or have at least seven storeys, and it must also contain at least two residential units or be a hospital or care home. A tower used only as offices does not become an HRB for this building-control purpose on height alone. Check carefully for mixed uses and the precise statutory scope.
For relevant building work to an existing HRB, BSR approval generally must be obtained before work starts, subject to the exceptions set out in the guidance. Listed categories of work include changes to internal layout, fire precautions, height or storeys, and common areas. The client is responsible for making sure the required approval is granted before work begins. The BSR’s higher-risk building approval guidance, published in March 2025 and updated in October 2026, sets out the test and process.
If the building is not an HRB for this purpose, building-control approval follows a separate route administered by a local authority or a registered building control approver, as applicable. The project should allow for assessment, inspections and completion or certification as required by the route. Confirm which route applies to the actual building and proposed work; do not infer it from height alone or assume that a planning decision covers building control.
What fire and construction-safety requirements should be planned?
Construction or alteration work is subject to building-regulations approval, and fire strategy should be coordinated with the design and building-control process. The London Fire Brigade’s GN_80 guidance on heritage and buildings of special interest discusses fire-risk assessment and fire-safety arrangements in that context. It is guidance, not a project-specific permit or a replacement for advice from the relevant fire-safety professionals.
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Before alteration, demolition or dismantling, the client should provide the contractor with a refurbishment or demolition survey prepared by a competent surveyor. This is important for identifying asbestos-containing materials that could be disturbed by the planned work. The Health and Safety Executive also advises obtaining structural surveys and planning work competently to prevent unplanned collapse. Consult the HSE’s guidance on structural stability during alteration, demolition and dismantling.
The Construction (Design and Management) Regulations 2015 apply to construction projects. HSE notification is required if a project is expected either to last longer than 30 working days and have more than 20 workers working simultaneously at any point, or to exceed 500 person-days. The client has the duty to notify the project, although another person may do so on the client’s behalf. This is a safety notification, not planning permission or building-control approval. Check the HSE’s CDM frequently asked questions when confirming the project’s duties and notification position.
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Do party walls, scaffolding or highway works need separate permissions?
They may trigger processes beyond the building’s planning and building-control approvals. If work is on or near a shared boundary or party wall, have the project team assess whether the Party Wall etc. Act applies and whether notices are required. A Party Wall Act process is not a planning application; its relevance depends on the specific work and neighbouring structures.
If scaffolding or another structure will obstruct a public highway, a written licence from the highway authority is required under section 169 of the Highways Act 1980, subject to the section’s terms and exceptions. Identify which highway authority controls the affected street and obtain any required licence before occupying or obstructing it. The statute is available at section 169 of the Highways Act 1980. Do not assume that permission to carry out building work also authorises a structure on the pavement or road.
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How should the approvals be checked and sequenced?
Start by defining the project accurately: internal fit-out, structural alterations, façade work, extension, demolition, change of use, fire-system changes, excavation, or some combination. Those details determine which authority and advisers need to be involved. A practical first-pass sequence is:
- Fix the site facts. Record the full address, the relevant planning authority, existing and proposed uses, planning history, and any conditions or obligations on past permissions.
- Check designations and controls. Confirm listed status, conservation-area status and other heritage constraints. If a designation applies, speak to the conservation officer early and establish what heritage evidence is required.
- Describe the work by impact. Identify what changes internally and externally, including structure, façade, use, fire precautions, demolition, excavation and effects on neighbours or public space.
- Confirm the planning route and evidence. Ask the planning authority whether permission is required, what supporting assessments it expects, and whether conditions or legal agreements could affect delivery.
- Determine the building-control route. Check the building’s uses and whether it meets the HRB definition for the proposed work. Confirm the relevant submission and approval requirements before work that requires approval begins.
- Plan safety surveys and duties. Arrange suitable structural and asbestos refurbishment or demolition surveys, establish CDM responsibilities, and check whether the HSE notification threshold is met.
- Check neighbours and logistics. Assess party-wall requirements and identify whether scaffolding or another structure will obstruct a highway, triggering a licence from its authority.
- Track conditions, inspections and close-out. Keep a project-specific schedule of approvals, pre-commencement conditions, notices, licences, inspections and completion evidence. Ask the relevant authority and competent advisers to confirm the required order and sign-offs.
The order can differ by project, and the list is not a substitute for a site-specific decision. In particular, secure any required BSR approval before relevant work on an HRB starts, and do not treat a pending application or one authority’s approval as permission to bypass a separate legal regime. The available data sources do not establish a typical permit count or approval timeline for London office-tower refurbishments, so obtain project-specific expectations from the authorities rather than relying on a generic schedule.
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Can I use the City of London’s major-application checklist for a tower in another borough?
Use it as an illustration of the kinds of evidence a major proposal can require, not as a universal London standard. The local planning authority for the site determines its own current validation requirements.
Does every major refurbishment need an environmental statement?
No. The City of London guidance identifies an environmental statement where significant impacts are likely; whether one is needed depends on the proposal and its effects. Ask the relevant authority which assessments are required for the actual site.
Does a highway licence cover the whole construction site?
The cited section 169 process concerns scaffolding or another structure obstructing the highway in connection with building work. It is not a general licence for all construction activity, and the authority controlling the affected street must be identified.
Can a lawful development certificate replace building-control approval?
No. A lawful development certificate gives a legally binding planning decision on whether a proposal is lawful; building regulations remain a separate regime. The certificate does not settle heritage consent, safety duties or other applicable permissions either.
