What changes if I convert a flat to an Airbnb?

Change of use = new fire-safety requirements. The Fire Service will require fire-rated doors, detection systems and possibly a second escape staircase.

Do I need a fire protection study for a detached house?

For new builds, yes. For existing houses the law is milder, but fire-rated doors and smoke detectors remain essential practice.

Building Regulations: What's Legally Required in Ordinary Homes vs. Commercial Premises (Hotels, Factories)

The Fire Protection Code is arguably the strictest legislation in building construction. And rightly so - it is written on lessons learned from past tragedies.

The legislator's core philosophy is simple: The risk dictates the measures. If you're sleeping at home with your family, you know the exits and can leave quickly. If you're in a hotel or an underground club with 500 strangers, panic is certain and escape is difficult. So the rules change.

1. Residential Buildings (The Basic Safety Net)

For detached houses and typical blocks of flats (where permanent residents live), the law focuses primarily on Passive Fire Protection and safe evacuation.

Residential: fire compartments, fire-rated stairwell doors, basic active measures

🏠 Apartment Separation

Each flat must form a separate fire compartment (separated from its neighbours by walls with a specific fire resistance, e.g. REI 60).

🪜 The Stairwell

The block's staircase is the "sacred" escape route. Apartment doors facing the stairwell must be fire-rated (typically 30 min), so that if a flat catches fire, the staircase doesn't fill with smoke.

🔧 Active Measures

These are usually modest. Portable fire extinguishers in common areas, emergency lighting (for power cuts) and simple smoke detectors (in new buildings) are required.

2. Commercial & Public-Assembly Premises (Maximum Stringency)

When we talk about hotels, shopping centres, hospitals, schools or factories, the law doesn't joke. Requirements skyrocket - and so does the construction cost.

Commercial: automatic fire doors, sprinklers, detection systems, multiple escape routes

🔒 Strict Compartmentation

The building is divided into strict "boxes". Corridor doors are fire-rated (60 or 90 min) and close automatically via magnets the moment the alarm sounds.

🚿 Mandatory Active Systems

A single fire extinguisher isn't enough. Central fire-detection systems, manual call points, permanent hydrant networks (hose reels) and, in large or underground spaces, a mandatory sprinkler system are required.

🚪 Alternative Escape Routes

One staircase isn't enough. Public-assembly occupancies require at least two (or more) independent and protected emergency exits, with illuminated EXIT signage and panic bars on doors.

3. The Biggest Trap: "Change of Use"

This is where most owners run into trouble. If you have an old ground-floor flat and decide to turn it into a restaurant, tutorial centre or clinic (Change of Use), the residential rules no longer apply!

Change of use: an old flat converted to a restaurant - new fire-safety regulations apply

⚠️ What the Fire Service Demands

The Fire Service will require you to implement the measures for the new use. This often means building a second escape staircase, removing timber floors, fitting fire-rated doors everywhere and installing fire-detection networks. It's the most expensive "surprise" in a commercial refurbishment.

4. The Experiment: Converting to an Airbnb / Boutique Hotel

Experiment: Scenario A (timber staircase, deadly trap) vs Scenario B (fire doors, certificate issued)

We buy an old, three-storey house. We want to rent it out as rooms.

❌ Scenario A (Ignorance of the Law)

We fit nice beds, put plain wooden doors in the rooms and start accepting guests. A guest forgets a cigarette. In 10 minutes, the timber staircase (the only way out) is filled with smoke. The building is a lethal trap. The Fire Service shuts our business down (at best) or we end up in prison (at worst).

✅ Scenario B (Applying the Regulations)

We hire an Engineer. We commission a Fire Protection Study. We fit fire-rated doors (EI 30) on every room. We install a central fire-detection system that sounds throughout the building, plus emergency lighting. The Fire Service issues us the Certificate. We sleep soundly, knowing our business is 100 % legal and safe.

The Bottom Line: The Fire Protection Code isn't mere "red tape" for getting a permit. It's your building's survival manual. Never start a construction project or change of use unless your engineer has first "locked in" the exact use category and fire-safety requirements.

Passive vs Active Fire Protection: Sprinklers & Structural Shielding Fire Resistance Time (30-120 min): What the Numbers Mean What Is Fire Resistance: R, E, I Indices & Load-Bearing Capacity Euroclasses (A1-F): Material Reaction-to-Fire Categories

Fire Protection: Passive Safety & Building Protection

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