Full Guide to Loft Conversions in London
- Tim Gjana
- Mar 11
- 4 min read
Updated: Mar 25
Loft conversions have become one of the most sought-after home improvement projects in London. With property prices rising and space at a premium, homeowners are looking for ways to maximize their existing homes rather than moving. A well-executed loft conversion can add significant value to your property while creating additional living space for your family.
At TNK Construction Ltd, we specialize in transforming underutilized lofts into beautiful, functional spaces. With over 17 years of experience in construction and a team of CITB-accredited builders, we’ve completed hundreds of loft conversions across North London and all boroughs of London. Whether you're considering a loft conversion for an extra bedroom, home office, or entertainment area, this guide will walk you through everything you need to know.
1. Types of Loft Conversions
Each property is unique, and the type of loft conversion you choose depends on factors such as roof structure, available space, and local planning permissions. Here are the most popular options:
Dormer Loft Conversion
The most common type, suitable for most London homes.
Extends the roof vertically, creating extra headroom and floor space.
Ideal for adding a bedroom, en-suite bathroom, or study.
Mansard Loft Conversion
Involves altering the roof structure to create a nearly vertical rear wall and a flat roof.
Maximizes available space and works well for period properties in London.
Often requires planning permission.
Hip-to-Gable Loft Conversion
Best for semi-detached and detached houses with a hipped roof.
Extends the roof by converting the sloping side into a vertical wall.
Ideal for increasing space and improving layout flexibility.
Velux (Rooflight) Loft Conversion
The simplest and most cost-effective conversion.
Involves installing skylights without major structural changes.
Perfect for homes with sufficient existing headroom.
2. Planning Permission and Building Regulations in London
Do You Need Planning Permission?
Many loft conversions in London fall under Permitted Development Rights (PDR), meaning you may not need planning permission if:
The extension does not exceed 40 cubic meters for terraced houses or 50 cubic meters for detached and semi-detached houses.
The extension does not extend beyond the existing roof slope facing the highway.
The materials used match the existing property.
However, if you live in a conservation area or are making significant structural changes, you’ll need planning approval from your local council.
Building Regulations Compliance
Regardless of planning permission, all loft conversions must comply with UK Building Regulations, covering:
Structural stability (reinforcing the existing roof structure if needed).
Fire safety (escape routes, smoke alarms, and fire-resistant doors).
Sound insulation (especially for semi-detached or terraced properties).
Staircase access and headroom requirements.
At TNK Construction, we handle all necessary approvals and work closely with local authorities to ensure compliance.
3. Benefits of a Loft Conversion
Increases Property Value
A loft conversion can add 20–25% to your home’s value, making it one of the best return-on-investment home improvements.
More Living Space Without Moving
Ideal for growing families needing extra bedrooms or a dedicated home office.
Energy Efficiency
Upgrading insulation during a loft conversion can reduce heating bills and improve energy efficiency.
Adds Aesthetic Appeal
With the right design, a loft conversion can enhance the character of your home.
4. The TNK Construction Loft Conversion Process
At TNK Construction, we follow a streamlined process to ensure a hassle-free experience for our clients.
Step 1: Free Consultation & Feasibility Study
We assess your loft space, discuss your requirements, and provide expert recommendations.
Step 2: Design & Planning
Our architects create detailed plans, ensuring compliance with local regulations.
We handle planning applications if required.
Step 3: Structural Work & Construction
Our skilled builders reinforce the existing structure, install insulation, and fit windows or dormers.
Step 4: Interior Finishing
Electrical work, plumbing, flooring, and final decor touches.
Step 5: Final Inspection & Handover
We conduct a thorough quality check and ensure compliance with building regulations.
5. How Much Does a Loft Conversion Cost in London?
Loft conversion costs vary based on the type of conversion, size, and materials used. Here’s a general breakdown:
Velux (Rooflight) Loft Conversion: £25,000 – £40,000
Dormer Loft Conversion: £35,000 – £55,000
Hip-to-Gable Loft Conversion: £45,000 – £65,000
Mansard Loft Conversion: £55,000 – £80,000
We provide transparent pricing with no hidden costs, ensuring value for your investment.
6. Why Choose TNK Construction for Your Loft Conversion?
✔ Experienced & Trusted
Over 17 years of experience in construction with CITB-accredited professionals.
✔ Local Expertise Across London
We serve all boroughs of London, from Central London to North London and surrounding areas.
✔ High-Quality Craftsmanship
We use top-quality materials and skilled tradesmen to deliver superior results.
✔ End-to-End Service
From planning and design to construction and finishing, we handle everything.
Why Choose TNK Construction Ltd?
Over 17 years of industry experience in new-build construction
CITB-accredited builders ensuring top-quality workmanship
Expert knowledge of London’s planning permissions and building regulations
A full-service approach, from initial concept to project completion
Coverage across London, including North, East, South, and Central London
If you're looking for a trusted new-build construction company in London, TNK Construction Ltd is ready to bring your vision to life. Contact us today for expert advice and a free consultation.
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