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Trusted Loft Conversions
A beautifully finished loft bedroom conversion
A Proper Bedroom — Not Just a Boarded Loft

Loft Bedroom Conversion Specialists

A loft bedroom conversion costs between £18,000 and £35,000 in the UK, including insulation, flooring, a staircase, and building regulations sign-off.

We build properly designed, building-regulations-compliant loft bedrooms — correct insulation, fire-safe flooring, natural light, and a safe permanent staircase. In other words, a real bedroom, not a boarded space with a ladder.

From £18,000
Timescale: 6–10 weeks

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What is a Loft Bedroom Conversion?

A loft bedroom conversion turns your unused loft into a fully habitable bedroom that meets building regulations. That last point matters. There is a world of difference between a boarded loft and a real bedroom. A boarded loft simply lays flooring over the joists for storage, whereas a genuine conversion gives you a comfortable, safe, energy-efficient room you can legally call a bedroom.

A proper loft bedroom must meet several legal requirements. These include floor joists sized for bedroom loading, warm roof insulation to current Part L standards, and fire-rated plasterboard. On top of that, you need emergency escape windows, a permanent staircase, mains-wired smoke alarms, and good ventilation. We build every loft bedroom to meet all of these as a matter of course.

The conversion type — Velux, dormer, or otherwise — shapes the external roof. The bedroom conversion itself is everything inside: the insulation, flooring, walls, ceiling, lighting, windows, and staircase. Together, these details create a room you will genuinely want to sleep in for the next 20 years.

Key Benefits of a Loft Bedroom Conversion

Adds a True Bedroom

A building-regs-compliant conversion counts as an additional bedroom when valuing or selling your home.

Year-Round Comfort

Proper warm roof insulation keeps the room warm in winter and cool in summer — essential for a bedroom.

Fire Safety Built In

Fire-rated construction, mains smoke alarms, and compliant escape windows are standard on every project.

Strong Property Value

Adding a bedroom to your home can increase its value by up to 20% — often exceeding the conversion cost.

Is a Loft Bedroom Conversion Right for My Home?

Most UK homes with a pitched roof can take a loft bedroom conversion. In practice, the deciding factor is usually headroom. Check these key criteria against your own home:

  • Ridge height of at least 2.5 m above existing ceiling joists (checked on free survey)
  • Pitched roof — flat roof properties may require more extensive structural work
  • Space on the floor below for a permanent staircase (we design to minimise floor loss)
  • Planning permission or Permitted Development eligibility confirmed on survey
  • Desire for a habitable room — not just additional storage space
  • Building regulations approval willingness — required for all habitable loft rooms

What's Included in Every Loft Bedroom Conversion

Free site survey and headroom assessment
Architectural drawings and building regs application
Structural engineer floor joist calculations
Warm roof insulation to Part L standard
New structural floor (fire-rated chipboard or engineered board)
Stud walls and fire-rated plasterboard throughout
Dormer or Velux windows for light and emergency egress
First-fix and second-fix electrical installation
Mains-linked smoke and heat alarm system
New permanent staircase and handrail
Fire-rated door to new staircase
Building regulations sign-off certificate

Typical Cost and Timescale

Cost Guide

From £18,000

That price buys a Velux-style loft bedroom, while dormer bedrooms start from £25,000. Every cost includes planning, structural, and building regs work, so there are no hidden extras.

Build Programme

6–10 weeks

The exact span depends on conversion type and specification. A Velux bedroom can be finished in 6 weeks, while a dormer bedroom typically takes 8–10 weeks.

Frequently Asked Questions

Does a loft bedroom require building regulations approval?
Yes — any loft conversion used as a habitable room needs building regulations approval, even if you don't need planning permission. Building regs make sure the room is structurally safe, properly insulated, fire-safe, and well ventilated. We submit the application on your behalf, and a building control officer inspects the work at key stages. You then receive a completion certificate — the proof that your loft is a legal bedroom when you come to sell.
What ceiling height is needed for a loft bedroom?
Building regulations require at least 2.2 m of clear headroom over a usable floor area of roughly 7.5 m². In practice, we chase every centimetre by insulating at rafter level — the warm roof method — rather than between the joists. That approach preserves the full height of the space. If your existing ridge sits at least 2.5 m above the ceiling joists, a comfortable bedroom is almost certainly achievable.
What type of staircase is needed for a loft bedroom?
Building regulations require a proper, permanent staircase — a loft ladder or retractable stair won't do for a habitable room. The stairs need around 600 mm of clear width, a maximum pitch of around 42 degrees, and a compliant handrail. We design every staircase to take as little space as possible from the floor below while meeting the rules. Where headroom on the landing below is tight, space-saving alternating-tread stairs are a smart option.
How is a loft bedroom insulated?
We insulate loft bedrooms using the warm roof method — fixing insulation between and below the rafters. This keeps the roof structure inside the home's insulated shell. The result: no cold bridging, no condensation risk, and no lost ceiling height. Part L of the Building Regulations sets the minimum standard for roofs, currently a U-value of 0.18 W/m²K. We routinely exceed it, because better insulation means a more comfortable bedroom and lower heating bills.
Will converting my loft into a bedroom add value to my home?
Yes. Adding a bedroom is one of the highest-returning home improvements you can make. According to Nationwide Building Society research, adding a bedroom through a loft conversion can increase property value by up to 20%. Crucially, buyers value a properly converted loft bedroom as additional square footage rather than just a bonus room. Estate agents report this consistently — provided the room has building regs sign-off, a proper staircase, and compliant insulation.

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