Replacing fire doors in an empty building is relatively straightforward. Replacing them while residents, patients, students or staff are still living and working inside is a very different challenge.

Across London, housing providers, managing agents and estates teams are carrying out large fire door replacement programmes in fully occupied buildings. Done well, residents barely notice. Done badly, it leads to complaints, delays, and doors that still fail to meet the standard.

This guide walks through how a successful replacement programme is planned and delivered, step by step.

When Is Fire Door Replacement the Right Choice?

Many defects can be put right through repairs and remediation. Replacement usually becomes the better option when a door has no traceable certification, when the leaf or frame is structurally damaged, or when repeated repairs have left it beyond its tested specification.

Replacement is also common when a building’s fire strategy changes, or when older flat entrance doors fall short of today’s fire and security expectations.

Also Read >>The Most Common Failures Found During BM TRADA Fire Door Inspections

Why Are Occupied Buildings More Complex?

In an occupied building, every door being replaced is someone’s front door, bedroom corridor or route to work. The building also has to remain safe throughout the works, which means compartmentation cannot simply be removed and left open.

A replacement programme in an occupied London building needs to balance:

•       Continuous fire safety while doors are being changed

•       Resident access, security and privacy

•       Noise, dust and working hours

•       Tight access in stairwells, lifts and narrow corridors

Step 1: Start With an Accurate Survey

Every successful programme begins with a detailed fire door survey. This records the location, rating, condition and dimensions of each opening, along with the surrounding wall construction and any fire stopping concerns.

A good survey will typically record:

•       The fire rating required for each opening

•       Door and frame dimensions, including any non-standard sizes

•       The condition of existing doors, frames and ironmongery

•       Accessibility needs, such as wider openings or powered closers

For flats, it is also worth confirming who is responsible for each flat entrance door, as this can depend on lease terms. Clarifying ownership early avoids disputes and access problems later. Our fire door inspections provide the clear, door-by-door data needed to plan replacement accurately.

Where the survey highlights gaps around frames or unsealed service penetrations, a fire stopping and compartmentation survey makes sure the wall around each new door is protected too.

Step 2: Specify Complete, Certified Doorsets

A replacement fire door should be supplied and installed as a complete doorset, with the leaf, frame, seals and ironmongery all covered by the same test evidence. Fitting a new leaf into an old frame is one of the most common routes to non-compliance.

For flat entrances, FD30s doorsets that also meet PAS 24 security standards are widely specified, giving residents both fire protection and peace of mind. Our front entrance fire doors are designed for exactly this role.

Communal areas, plant rooms and service corridors may need different specifications, such as higher-rated or steel fire doors, depending on the building’s fire strategy.

Step 3: Plan the Programme Around Residents

Clear communication is what separates a smooth programme from a difficult one. Residents should know when work is happening, how long it will take and what they need to do.

Good practice includes:

•       Written notice and appointment slots for every property

•       Completing each flat entrance door within a single visit wherever possible

•       Extra support for elderly or vulnerable residents

•       A named contact for questions and concerns

Under the Fire Safety (England) Regulations 2022, responsible persons in multi-occupied residential buildings must also give residents information on why fire doors should be kept shut, why they must not be tampered with, and how to report faults. A replacement programme is an ideal time to share this.

For Worthing Homes, our dedicated project team replaced 200 front entrance doors across occupied homes, keeping resident communication at the heart of delivery. The works were completed on time and on budget with minimal disruption.

How Do You Keep the Building Safe While Works Are Underway?

The building must stay protected at every stage of a replacement programme. That means no opening should be left without an effective fire door overnight, and communal doors on escape routes should be replaced in phases so that protected routes remain in place.

It also helps to agree the programme with the building’s fire risk assessor in advance, particularly where evacuation strategies or alarm systems may be affected. Coordinating these details early prevents the works themselves from creating new fire safety risks.

Step 4: Install, Certify and Record

Once doors are on site, installation quality decides whether they perform as tested. Certified installers fit each doorset to the manufacturer’s instructions, check gaps and closing action, and issue documentation for every opening.

Those records form part of the building’s safety information and support future inspections, audits and resident enquiries. Professional fire door installation should always end with a clear, door-by-door record.

Also Read >>What Does BM TRADA Certification Mean for Fire Door Installation in London?

Step 5: Protect the New Doors From Day One

New fire doors start to wear from the moment they are used. Building a maintenance plan into the programme protects the investment and keeps doors compliant for years.

A pre-planned fire door maintenance schedule makes sure closers, seals and hinges are checked regularly, while telling residents not to wedge doors open or remove closers helps prevent early failures.

How Long Does a Fire Door Replacement Programme Take?

Timescales depend on the size of the building, the number of doors and the doorsets specified. An individual flat entrance door can often be replaced within a single visit, while estate-wide programmes are usually phased block by block over several weeks or months.

Lead times for certified doorsets manufactured to size should be built into the plan from the start. Ordering against accurate survey measurements helps avoid delays caused by doors that do not fit the opening.

Final Thoughts

Fire door replacement in an occupied building is the process of removing and installing certified fire doorsets while residents or staff remain in place, and it succeeds when it is planned around people as much as products. An accurate survey, complete certified doorsets, clear resident communication and certified installation together deliver doors that are compliant from day one.

For London housing providers and property managers, choosing experienced, BM TRADA certified fire door contractors with a proven record in occupied buildings is the most reliable way to reduce disruption and risk. To plan your fire door replacement programme, get in touch with Capital Fire Doors.