When we begin thinking of home extensions, many of us focus on floor plans, finishes, and how to increase light. Yet, one of the most important decisions often gets overlooked: choosing the right doors. Specifically, whether to use FD30 vs standard internal doors. That choice can mean the difference between safety, compliance, and peace of mind — or costly problems down the line. If you’re planning an extension, it’s essential to understand it properly.

If you’d like to discuss fire-rated internal doors or door replacements for your extension, please call us on 01342 822 750 or email info@agkerrcarpentry.co.uk.

When building out, we realised our old internal doors wouldn’t cut it beside the kitchen extension. We replaced them with FD30 fire doors and felt instantly more secure, confident that we’d done the right thing. — A.G. Kerr Carpentry.

What Is An FD30 Door?

An FD30 door is a fire-rated door designed to resist fire for 30 minutes, as tested under standard conditions according to BS EN 1634. In simple terms, this rating means that the door, its frame, hinges, seals, and closers work together to limit the spread of fire and smoke for at least 30 minutes.

  • The “FD” stands for Fire Door.
  • The “30” indicates the number of minutes it can hold back fire.
  • It must meet specific standards, including the use of correct materials, fire-resistant glazing (if applicable), intumescent strips/seals, and proper installation.

Standard Internal Doors: What They Do — And Don’t Do

Standard internal doors are typically functional for privacy and aesthetics. They may isolate rooms, but are not built to resist fire or prevent smoke spread. Key points:

  • No certification for holding back fire.
  • Gaps, materials, or hinges are not designed for fire safety.
  • Inadequate for legal or insurance compliance in specific extensions or refurbishment projects, especially when compartmentation or means of escape are affected.

FD30 Vs Standard Internal Doors: A Comparison

Feature FD30 Internal Doors Standard Internal Doors
Fire Resistance 30 minutes under fire test conditions Not fire tested — no guaranteed resistance
Components Fire-rated frame, seals, latches, hinges, and closers Basic frame, usual fittings
Smoke Sealing Intumescent strips and seals help prevent the spread of smoke Usually lacks smoke containment features
Regulation Compliance Needed where fire safety regs demand; see our Fire Safety Compliance Solutions page May not satisfy safety regulations in specific builds
Cost Higher material & installation costs are greater Lower but possibly risky over the long term

Why Fire Rating Matters In Home Extensions

1. Legal And Safety Requirements

Fire safety regulations in the UK are tightening. Under our Fire Safety Compliance Solutions service, we often recommend or install fire-rated internal doors to make sure your extension complies. Part of that includes BS EN 1634 standards and the correct installation of door closers and seals.

2. Protection Against Fire Spread

In the event of a fire, partitioning spaces (compartmentation) reduces the risk of fire and smoke spreading quickly. An FD30 door can buy extra time for escape and reduce damage. Extensions often alter the layout, potentially affecting escape routes — the door you choose can significantly influence this.

3. Insurance And Resale Value

Insurance providers may require fire-rated internal doors to be installed in specific configurations. If you don’t use FD30 doors where necessary, you may face premium increases or claim denials. Similarly, future buyers will expect safe and up-to-date standards. Using FD30 doors can enhance the perceived value of your home, particularly when considering projects under “New Builds” or “Refurbishments” on our site.

4. Design And Practicality

While FD30 doors are thicker, heavier, and more complex than standard doors, modern designs allow them to blend seamlessly with aesthetics. Additionally, proper installation is crucial — the fire rating is only valid if everything (frame, seal, and closer) is correct.

When To Use FD30 Doors In Your Extension

  • Between the main house and an extension, particularly if there’s an opening into a kitchen or utility.
  • Doors protecting escape routes, staircases, or rooms where fire risk is higher.
  • For multi-occupancy buildings or where regulations require compartmentation.
  • If building regulations or insurance require them (always check local building control).

Balancing Cost, Aesthetics And Compliance

We understand that FD30 doors are more expensive, both in materials such as fire-rated cores and necessary hardware (seals, closers). But consider this:

  • Think long-term: safety, insurance, and legal compliance.
  • Choose styles that match your design — timber finishes, glazing (with fire-rated glass), and matching handles.
  • Use a trusted supplier and installer. At A.G. Kerr Carpentry, we handle supply, installation, and certification where needed. See our bespoke joinery page for style and fitting options.

CONTACT A.G. KERR CARPENTRY

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How We Help At A.G. Kerr Carpentry

Here at A.G. Kerr Carpentry, we offer comprehensive fire safety compliance solutions for internal door upgrades and replacements. We can:

  • Assess your current doors and advise whether FD30 is required.
  • Supply and install certified FD30 fire doors and hardware.
  • Ensure installation meets BS EN 1634 standards: correct frame, sealing, and closers.
  • Include fire-rated internal doors as part of extension or refurbishment jobs — discuss this when considering your extension or new build projects.

Conclusion

In deciding between FD30 vs standard internal doors, it’s not just about compliance — it’s about protecting your family, your property, and future-proofing your investment. While standard internal doors may appear cheaper initially, they carry hidden risks.

If you’re embarking on an extension, want to refurbish with care, or simply want peace of mind, we’re here to guide you through choosing the right doors.

Call us on 01342 822 750 or email info@agkerrcarpentry.co.uk to arrange a free consultation — let’s ensure your home is built safely and beautifully.

Common FAQ’s About FD30 Vs Standard Internal Doors

1. What is the difference between FD30 and FD60 doors?

FD60 doors resist fire for 60 minutes instead of 30. They’re heavier, thicker, and more costly — often used for commercial or particularly high-risk areas.

2. Do all fire doors need self-closing hinges?

Yes — for FD30 doors, you need fire door closers so the door shuts automatically. Without proper closers and seals, the rating may be void.

3. Can I have glass panels in an FD30 door?

Yes — if the glass is fire-rated to the same standard, often labelled as fire-resistant glazing, it’s acceptable. The frame and seals must also meet specifications.

4. Is retrofitting a standard door with fire elements sufficient?

Often, no, only certified FD30 doors guarantee performance. While adding seals/closers helps, the core structure, frame, and made components might not meet fire test requirements.

5. How do I know if my door is truly FD30 certified?

Look for certification labels, dust chips showing test standards, ratings, suppliers, and dates. Trustworthy installers (like us) always verify these components.