What is a fire door?
Understand what a fire door is, how a complete doorset controls fire and smoke, where fire doors are used and why every component and installation detail matters.
Read the guideFire-door reference library
Fire doors: requirements, components and inspections
Understand the complete doorset, check legal and design requirements, investigate common components and move from a visible concern to proportionate professional support.
Start with the role
A fire door is a system—not a standalone leaf
Its expected performance depends on the opening, leaf, frame, fixings, seals, hinges, closer, latch, glazing, apertures, installation and ongoing use. The correct detail varies with the compartment line and building design.
This library explains each subject without turning common specifications into universal legal rules. Where evidence is missing or condition is uncertain, use a competent inspection to identify what can be confirmed and what needs further investigation.
Fire-door anatomy
Ten checkpoints across the complete doorset
A fire door is not just the leaf. Its frame, seals, closer, ironmongery, apertures, gaps and surrounding construction must work together.
- 1Door leaf
Damage, warping, unsupported alterations and available identity or performance evidence.
- 2Frame and wall interface
Condition, fixings, alignment and evidence for the surrounding fire-stopping interface.
- 3Self-closer
Closes the door reliably from relevant positions without obstruction.
- 4Hinges and fixings
Suitable number, condition, security and compatibility with the doorset evidence.
- 5Fire and smoke seals
Presence, continuity, condition, location and compatibility.
- 6Gaps and alignment
Measure and compare with the relevant doorset evidence rather than assuming one universal dimension.
- 7Latch, lock and ironmongery
Allows intended closing and escape without compromising fire performance.
- 8Glazing and apertures
Glass, beads, letterplates, viewers, grilles and other openings remain supported and suitable.
- 9Threshold and floor
The bottom gap, floor finish and any threshold seal support the intended smoke and fire performance.
- 10Signage, use and alterations
Correct signs where required, no wedging, and access-control or security changes properly considered.
Complete reference cluster
Choose the fire-door question you need to answer
Each guide gives a direct answer, practical checks, important limitations, FAQs and links to primary or authoritative sources.
Requirements and evidence
Start with the door’s role, required performance and reliable evidence.
Fire door requirements
A practical guide to fire door legal requirements in England, including specification, self-closing, maintenance, residential checks and competent inspection.
Read the guideFire door ratings explained
Understand FD30, FD60, smoke-control suffixes, integrity and insulation, and how the correct fire door rating is selected for a building.
Read the guideFire door certification explained
Understand fire door labels, plugs, certificates, third-party schemes, installation records and what certification can and cannot prove.
Read the guideFire door test standards explained
Understand BS 476, BS EN 1634-1, integrity, smoke leakage, classification, assessments and the Approved Document B transition timetable.
Read the guideComponents and operation
Understand the parts and interfaces that must work as a complete doorset.
Fire door components explained
Learn how fire door leaves, frames, hinges, closers, latches, seals, glazing and other components work together in a compliant doorset.
Read the guideFire door closers explained
Learn how fire door closers work, how to check closing and latching, common faults, accessibility considerations and when adjustment needs a competent person.
Read the guideHow to adjust a fire door closer safely
A safety-first guide to diagnosing fire door closer problems, understanding common adjustments and knowing when to use a competent fire-door maintainer.
Read the guideIntumescent and smoke seals
Understand the difference between intumescent and smoke seals, where they are fitted, common defects and why compatibility with the doorset matters.
Read the guideFire door glazing explained
Understand fire-resisting glass, glazing systems, vision panels, common defects and why replacing or modifying fire door glazing needs compatible evidence.
Read the guideFire door hold-open devices
Understand electromagnetic hold-open devices, free-swing closers, alarm interfaces, release testing and why wedges are not an acceptable substitute.
Read the guideFire door signage requirements
Understand keep-shut, keep-locked and automatic-fire-door signs, where fire door signage is used and why a sign does not prove doorset compliance.
Read the guideInstallation, checks and maintenance
Plan competent work, inspection frequency, repair and verified closure.
Fire door installation guide
Understand competent fire door installation, opening surveys, frame-to-wall fire stopping, commissioning evidence and quality checks.
Read the guideFire door maintenance guide
Plan fire door maintenance, prioritise defects, select compatible repairs, record work and verify doors after remedial action.
Read the guideFire door inspection frequency and regime
Plan a proportionate fire door inspection regime and understand the difference between routine checks, technical surveys and residential legal intervals.
Read the guideFire door defect statistics
Understand commonly quoted UK fire door defect statistics, their sources, sampling limitations and how to use inspection data responsibly.
Read the guideFlat entrance doors
Apply the specific England duties and proportionate existing-door guidance.
Flat entrance fire doors
Understand flat entrance fire door responsibilities, annual checks in taller buildings, access, resident information and proportionate action for existing doors.
Read the guideChoose the next action
Match the question to the right level of support
Do not commission a full replacement programme when the problem is an evidence gap, or rely on a light visual check where performance-affecting defects need competent investigation.
Need a quick record?
Use the free 38-point checklist to record observations without claiming certification.
Open the checklist →Need a technical opinion?
Define the doors, building evidence, inspection depth, exclusions and reporting required.
Read the inspection guide →Planning a budget?
Estimate a range using door numbers and survey scope before comparing quotations.
Use the cost calculator →Known installation or repair issue?
Use the installation and maintenance guides to brief competent remedial work.
Plan remedial action →Inspection toolkit
Record, estimate and commission
The reference guides support decisions; these practical pages help turn the decision into a recorded check or properly scoped inspection enquiry.
FreeFire door inspection checklist
Work through 38 visual and operational checks and save the record.
CalculatorInspection cost estimatorBuild an indicative £25–£55 per-door range from the scope.
Service guideProfessional fire-door inspectionsUnderstand survey scope, reports, competence and quotations.
Frequently asked questions
Fire-door essentials
Use the dedicated guides for the full answer, sources and building-specific limitations.
What is a fire door?
A fire door is a complete tested or assessed doorset intended to resist fire and, where required, smoke for a stated period. Performance depends on the leaf, frame, hardware, seals, glazing, installation and condition.
How often should fire doors be inspected?
Frequency should reflect legal duties, risk, use and damage. In specified multi-occupied residential buildings over 11 metres, communal fire doors require checks at least every three months and flat entrance fire doors require best-endeavours checks at least annually.
Does every fire door need to be FD30S?
No. The required integrity and smoke-control performance depends on the door location, compartmentation and approved building design. FD30S is common but not a universal specification.
Can an existing fire door without certification remain in use?
Potentially. Government residential guidance says absence of modern certification alone does not make an older door unfit. Its construction, condition, intended role, original standard and current risk still need proportionate assessment.
Professional support
Find a fire door inspector in London or Surrey
Tell us the premises type, approximate number of doors and what prompted the enquiry. A relevant provider can review the likely scope and contact you about a quotation.
- No obligation to proceed
- Telephone number required for useful follow-up
- Your enquiry may be shared with a relevant provider
Editorial scope
Independent, source-led guidance
The library is general information for England and does not certify an installed door or replace a fire risk assessment. Legal statements are checked against legislation and Government guidance; technical statements distinguish standards, common practice and doorset-specific evidence.