Loft Conversion Mansard Loft Conversions London, Essex & Hertfordshire
Struggling with a cramped loft that feels unusable?
A mansard loft conversion transforms even the trickiest roof into a spacious, stylish living area; maximising every inch of your home without moving.
Book your free mansard loft conversion consultation today with B&G Lofts.
Benefits of a Mansard Loft Conversion
- Significantly more space: Creates a full-height room across most of the loft.
- Adds major value: Can increase property value by 20–25%.
- Blends with character homes: Ideal for terraced houses and period buildings.
What is a Mansard Loft Conversion
A mansard loft conversion involves altering the roof structure to create a nearly vertical back wall (72°) and a flat roof. This maximises headroom and floor space, making mansards one of the most spacious types of loft conversion available.
Mansards are especially popular in urban areas like London where homeowners want to add entire new storeys to their homes without compromising style. They’re also well-suited for period properties across Essex and Hertfordshire, where extra space blends seamlessly into the existing architecture.
Why Choose B&G Lofts for Your Mansard Conversion
We’re specialists in complex loft conversions like mansards. Our team manages everything from architectural drawings and planning permission through to construction and finishing.
- Experienced with London, Essex, and Hertfordshire planning requirements
- Full project management for a hassle-free process
- Skilled trades with proven mansard expertise
- Transparent costs with no surprises
Book Your Free Site Survey and Feasibility Assessment
Types of Mansard Loft Conversions
Rear Mansard
The most common type, built at the back of the property. Perfect for terraced and semi-detached houses.
Front Mansard
Less common due to planning restrictions but possible in certain properties.
L-Shaped Mansard
Combines two mansards to maximise space in period homes with rear outrigger roofs.
Our Mansard Loft Conversion Process
1. Initial Consultation
Free survey to assess feasibility.
2. Design & Planning
Bespoke design tailored to your lifestyle.
3. Planning Permissions
Mansards always require permission; we manage the application.
4. Construction and Finishing Touches
Structural changes, new walls, roof, and interior build. Flooring, insulation, electrics, plumbing, and final decoration.
Cost of a Mansard Loft Conversion
Mansard conversions are more complex and therefore costlier than dormer or Velux conversions. Expect prices between £50,000 and £80,000 depending on size, location, and finishes.
Factors influencing cost:
- Property type (terrace, semi-detached, detached)
- Size of the conversion
- Number of rooms added (bedroom, en-suite, office)
- Location – projects in London may cost more than Essex or Hertfordshire
Planning Permission for Mansard Loft Conversions
Unlike dormers or Velux conversions, mansards always require full planning permission due to the significant change to the roofline. B&G Lofts handles all paperwork and liaises with local councils in London, Essex, and Hertfordshire to ensure approval is secured quickly.
Case Studies – Mansard Loft Conversions
Islington, London
A Victorian terraced house was transformed with a full rear mansard, adding a luxury master bedroom with en-suite. Planning was managed in-house, and the build took 12 weeks.
Brentwood, Essex
A semi-detached family home gained a mansard conversion to create two additional bedrooms and a shower room. The design blended seamlessly with neighbouring properties.
Questions FAQs about our Mansard Loft Conversions in London, Essex & Hertfordshire
What is the average cost of a mansard loft conversion in London?
Do mansard loft conversions always need planning permission?
How long does a mansard loft conversion take?
Can mansards be built on semi-detached houses in Essex?
Will a mansard conversion add value to my property?
Thinking about maximising your loft space with a mansard conversion?
If you are considering a mansard loft conversion in Essex or London, B&G Lofts can support you from the first idea through to the finished space. Our team is committed to steady workmanship and a simple, stress free process. Get in touch today to book a free consultation and no obligation quote.
We would be pleased to help you shape a home that gives you the room you need.