Loft Conversion London | Trusted Loft Conversion Company
Looking to add space and value to your home without the cost and upheaval of moving? A loft conversion is one of the smartest investments a London homeowner can make. At SBDS Construction Ltd, we design and build high-quality loft conversions across London and Essex — turning unused roof space into beautiful bedrooms, home offices, en-suites and living areas.
With years of hands-on experience, our skilled team manages the entire project under one roof: design, structural work, planning support, construction, electrics, plumbing and finishing. We handle the details so you do not have to, keeping the work clean, on schedule and built to last. Every conversion is backed by our written warranty, and our 5.0-star Google rating reflects the standard we bring to every home.
From a simple Velux conversion to a full mansard, we tailor each project to your property, your budget and the way you want to live. Whether you need an extra bedroom for a growing family or a quiet office away from the noise, we make it happen with honest advice and proper craftsmanship.
- Years of experience
- Fully insured
- Design & build under one roof
- London-wide coverage
55 Google Reviews
5.0 Google Rating
55 Reviews
3–5 Year Written Warranty
Every project
Free Quotations
No obligation
Trusted Local Builders
London & Essex
Trusted Loft Conversion Specialists Across London
As an established loft conversion company in London, SBDS Construction Ltd has built its reputation on quality workmanship and reliable delivery. Our loft conversion specialists combine practical building experience with a genuine eye for design, so the finished space looks right and works hard for your home.
When you choose our loft conversion builders in London, you get qualified, experienced tradespeople, fully insured work, and a team that knows London's housing stock — from Victorian terraces to 1930s semis and modern builds. Every project is handled end to end by one dedicated point of contact, with bespoke designs created around your property rather than a one-size-fits-all template. We are local, we are accountable, and we are here long after the job is done.
What is a Loft Conversion?
A loft conversion is the process of transforming unused attic or roof space into a functional, habitable room — such as a bedroom, office or bathroom. It adds usable floor space and value to your home without changing the building's footprint, making it one of the most popular home improvements in London.
Unlike a home extension, which expands your property outwards or to the side and uses up garden or land, a loft conversion works upwards within your existing roof structure. That makes it less disruptive to your outdoor space and, in many cases, simpler from a planning perspective. Homeowners across London choose loft conversions because they deliver significant extra living space, strong returns on investment, and a practical solution to growing space needs — all without the cost, stress and stamp duty of moving house.
Why Invest in a Loft Conversion in London?
With London property prices among the highest in the UK, moving to a bigger home is expensive once you factor in stamp duty, agent fees and moving costs. A loft conversion adds living space and value to your existing home for a fraction of that cost — often adding up to 20% to a property's value.
In a city where space is at a premium, every square metre counts. A loft conversion lets you stay in the home, area and school catchment you love while gaining the extra room your family needs. It is a better long-term investment than many alternatives: you avoid the upheaval of relocating, you increase your property's resale value, and you create genuinely useful living space — whether that is a master suite, a home office, or a room for a growing family. For most London homeowners, improving rather than moving is simply the more sensible financial decision.
Types of Loft Conversions We Offer
We design and build every main type of loft conversion. The right choice depends on your roof shape, property type, budget and how much space you want to gain. Here is a clear guide.
Dormer Loft Conversion London
A Dormer Loft Conversion is one of the most popular choices for London homes, creating additional headroom and usable floor space by extending vertically from the roof. It is ideal for terraced and semi-detached properties, offering a cost-effective way to add a spacious bedroom, office, or en-suite.
Mansard Loft Conversion London
A Mansard Loft Conversion transforms your roof with a near-vertical rear wall and flat roof, creating the maximum possible living space. Popular for Victorian and Edwardian homes across London, it delivers a premium finish and is perfect for homeowners seeking a complete loft transformation.
Hip to Gable Loft Conversion London
A Hip to Gable Loft Conversion extends the sloping side roof into a vertical gable wall, significantly increasing the loft's width and floor area. It is an excellent solution for semi-detached and detached homes, often combined with a rear dormer for even greater living space.
Velux / Roof Light Loft Conversion London
A Velux Loft Conversion enhances your existing loft by installing roof windows without changing the roof structure. It is the most affordable and least disruptive option, making it perfect for homes with sufficient head height while bringing in plenty of natural daylight.
L-Shape Loft Conversion London
An L-Shape Loft Conversion combines two dormers to create a large, versatile living area, making it ideal for Victorian and Edwardian properties. This design provides enough room for multiple bedrooms, a luxury master suite, or a spacious home office with an en-suite.
Bungalow Loft Conversion London
A Bungalow Loft Conversion transforms unused roof space into a fully functional upper floor, nearly doubling your home's living area. It is an excellent investment for homeowners who need extra bedrooms, bathrooms, or flexible family space without the expense of moving home.
| Loft Type | Space Gained | Relative Cost | Planning Permission |
|---|---|---|---|
| Velux / Roof Light | Low–Medium | £ | Rarely needed |
| Dormer | Medium–High | ££ | Often permitted development |
| Hip to Gable | High | ££–£££ | Sometimes needed |
| L-Shape | Very High | £££ | Often needed |
| Mansard | Highest | £££ | Usually needed |
| Bungalow | Very High | ££–£££ | Often needed |
Benefits of a Loft Conversion
More Living Space
Gain a whole new floor without losing your garden.
Adds Property Value
A well-built conversion can add significant value to a London home.
Home Office
A quiet, dedicated space to work from home.
Rental Income
Create a lettable room or self-contained space.
Energy Efficiency
Modern insulation improves your home's warmth.
No Need to Move
Avoid stamp duty, agent fees and the stress of relocating.
Better Natural Light
Roof windows flood the new space with daylight.
Loft Conversion Cost in London
The cost of a loft conversion in London depends on the type of conversion, the size of your loft, the amount of structural work, and the finish you choose. Because every property is different, we provide a free site visit and an accurate, fixed written quote rather than a one-size-fits-all price.
The main factors that affect the cost of your loft conversion are:
Loft size
Larger spaces require more materials and labour.
Loft type
A Velux conversion costs far less than a full mansard.
Structural work
Steel beams, floor reinforcement and roof alterations add to the cost.
Planning permission
Some conversions require applications and drawings.
Materials
Your choice of windows, flooring and fittings affects the final figure.
Interior finishing
En-suites, built-in storage and high-end finishes increase the budget.
Rather than guess, we give you a clear, itemised quote so you know exactly what you are paying for.
Our Loft Conversion Process
1
Consultation
We discuss your ideas, needs and budget.
2
Survey
We assess your loft, roof and structure.
3
Design
We create a design tailored to your home.
4
Planning
We handle planning permission and drawings where needed.
5
Construction
Structural work, dormers and the new floor are built.
6
Electrical
Wiring, lighting and sockets are installed.
7
Plumbing
Any en-suite or heating work is completed.
8
Decoration
Plastering, flooring, painting and finishing.
9
Completion
Final inspection, handover and warranty.
Loft Conversion Timeline
Every project is different, but a typical loft conversion in London runs to roughly this schedule:
Week 1
Scaffolding, site set-up and structural openings.
Week 2
Steel beams and new floor structure installed.
Week 3
Dormer construction and roof alterations.
Week 4
Roofing, windows and the structure made weather-tight.
Week 5
First-fix electrics and plumbing, insulation.
Week 6
Plasterboarding and plastering.
Week 7
Staircase fitting, second-fix electrics and plumbing.
Week 8
Decoration, flooring, final finishing and handover.
Timelines vary with the type and size of conversion; we confirm a realistic schedule in your quote.
Planning Permission for Loft Conversions
Many loft conversions in London fall under permitted development and do not require full planning permission, provided they stay within certain size and design limits. However, planning permission is usually needed for larger conversions, flats, listed buildings, and homes in conservation areas.
✓ Permitted Development — Often Allowed
- Stays within volume allowances (up to 40m³ for terraced, 50m³ for detached/semi)
- Does not extend beyond the existing roof slope on the front elevation
- Uses materials similar to the existing house
- Standard dormer and Velux conversions on most houses
⚠ Planning Permission — Usually Needed
- Flats and maisonettes
- Listed buildings
- Properties in conservation areas or under Article 4 direction
- Conversions exceeding permitted development limits
- Mansard conversions that alter the roof slope significantly
Building Regulations
Every loft conversion in London must comply with Building Regulations, regardless of whether planning permission is required. These regulations make sure your new space is safe, warm and structurally sound. Key areas include:
Fire safety
Protected escape routes, fire doors and mains-interlinked smoke alarms.
Insulation
Meeting thermal efficiency standards for walls, roof and floor.
Staircase
A safe, compliant permanent staircase with adequate headroom.
Roof strength
Ensuring the roof structure can support the changes.
Structural steel
Beams to carry the new floor and any roof alterations.
Ventilation
Adequate airflow to prevent damp and condensation.
Escape windows
Emergency egress windows where required.
Our team manages Building Regulations approval as part of the project, so your conversion is fully compliant and signed off.
Why Choose SBDS Construction?
When you trust us with your loft conversion, you get a team that treats your home as if it were our own:
Experienced team with proven loft conversion expertise
Local London builders who know the housing stock and planning rules
High-quality materials from trusted suppliers
Transparent pricing with clear, itemised written quotes
Dedicated project manager as your single point of contact
Fully insured work
Excellent reviews — 5.0 stars from 55 Google reviews
Excellent reviews — 5.0 stars from 55 Google reviews
Loft Conversion Timeline
Not sure how to use your new space? A loft conversion can become almost anything:
- Master Bedroom
- Walk-in Wardrobe
- Guest Room
- Home Office
- Gaming Room
- Home Cinema
- Gym
- Study
- Kids' Room
- Library
Whatever you have in mind, we will help you design a space that fits your lifestyle and makes the most of every corner of your loft.
Areas We Cover Across London
We provide loft conversions right across London and the surrounding areas, bringing local knowledge to every project.
- Loft Conversion in North London
From period terraces to family semis, we convert lofts across North London, working sympathetically with the area's mix of Victorian and 1930s homes.
- Loft Conversion in South London
We help South London homeowners gain extra bedrooms and home offices, tailoring each conversion to the local housing styles.
- Loft Conversion in East London
As a Chadwell Heath–based company, East London is our home turf. We know the terraces and semis here inside out.
- Loft Conversion in West London
We deliver high-specification conversions across West London, from compact Velux projects to full mansards.
- Loft Conversion in Central London
We carry out carefully managed conversions in Central London, working within conservation and planning constraints where needed.
- Boroughs We Cover
- Camden
- Islington
- Barnet
- Croydon
- Ealing
- Hounslow
- Richmond
- Harrow
- Kingston
- Greenwich
- Hackney
- Enfield
- Bromley
- Wandsworth
- Westminster
- Chelsea
- Fulham
- Brent
- Hillingdon
- Havering
- Romford
- Ilford
- Hackney
- Barking
- Dagenham
London Coverage Map
Chadwell Heath, Romford RM6 6AX — covering all London boroughs & Essex
Recent Loft Conversion Projects
Take a look at some of our recent loft conversion work across London.
Dormer Loft Conversion
Location: East London
Type: Dormer
Duration: 7 weeks
Master Suite Conversion
Location: North London
Type: Hip to Gable
Duration: 8 weeks
Full Mansard Conversion
Location: South London
Type: Mansard
Duration: 10 weeks
CUSTOMER REVIEWS
Our customers consistently rate us 5.0 stars on Google. Here is what a few of them say:
5.0 Rating
· 55 Verified Google Reviews
“Outstanding quality and finished five days ahead of schedule. The team was professional throughout and the result exceeded our expectations.”
Sheenu Gill
Chadwell Heath
“Brilliant advice on the layout — completed professionally and on time. I would not hesitate to recommend SBDS to anyone looking for quality builders.”
Khushdeep Singh
Romford
“Fast, top-quality work on our whole bathroom — very reliable. Every detail was done to a high standard and the team left everything spotless.”
Raza Khan
Ilford
Frequently Asked Questions
A loft conversion turns unused attic or roof space into a habitable room, such as a bedroom or office, adding space and value without changing your home’s footprint.
Many loft conversions fall under permitted development and do not need planning permission, but larger conversions, flats, listed buildings and conservation areas usually do. We assess and handle this for you.
The cost depends on the type, size, structural work and finish. We provide a free site visit and an accurate written quote rather than a fixed one-size-fits-all price.
A typical loft conversion takes around 6 to 8 weeks, depending on the type and complexity. We confirm a realistic timeline in your quote.
Most houses can, but it depends on your roof type, head height and structure. We carry out a survey to confirm whether your loft is suitable.
Yes. A well-built loft conversion can add significant value to a London home — often up to around 20%, depending on the property and area.
For most London homeowners, yes. It adds living space and value for far less than the cost of moving, while letting you stay in the home you love.
A Velux or roof light conversion is the most affordable, as it uses the existing roof shape without major structural changes.
Yes. Every loft conversion must comply with Building Regulations for safety, fire protection, insulation and structure. We manage this as part of the project.
In most cases, yes. Much of the early work is done from outside via scaffolding, though there will be some disruption during certain stages.
As a general guide, you need around 2.2 metres of usable head height at the highest point. We measure this during the survey.
A dormer extends part of the roof to add space and headroom, while a mansard rebuilds the whole roof slope into a near-vertical wall for maximum space.
Yes. Building Regulations require a permanent, safe staircase to access the new room, which we design to fit your home.
There is some unavoidable noise and dust, but our team works cleanly, protects your home and keeps disruption to a minimum throughout.
Yes. We offer a full design-and-build service, handling everything from drawings and planning to construction and finishing under one roof.
Yes, many of our conversions include en-suite bathrooms. We handle all the plumbing and waterproofing as part of the project.
We assess your roof type, property and budget during a free consultation and recommend the most suitable and cost-effective option.
Modern loft conversions use high-performance insulation that improves your home’s warmth and can help reduce heating costs.
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A quality loft conversion, especially one that adds a bedroom and bathroom, can add a substantial percentage to your property’s value in London.
All our loft conversions are covered by a written warranty of 3 to 5 years, giving you long-term peace of mind.
Yes. Converting a bungalow loft into a full first floor is one of the most transformative projects we offer.
We can include acoustic insulation to reduce noise between the new room and the rest of the house.
Simply call us, email us or fill in our form. We will arrange a free survey and provide a clear, no-obligation quote.
We cover London and the surrounding Essex area, including most boroughs across the capital. Get in touch and we will confirm.
Why London Homeowners Trust SBDS Construction
London homeowners trust SBDS Construction Ltd because we combine genuine experience with honesty and care. We communicate clearly at every stage, deliver quality workmanship using premium materials, and stand behind every project with a written guarantee. We work safely and tidily, respect your home and your time, and provide transparent, itemised quotes with no hidden costs. That combination of expertise, reliability and straightforward dealing is why so much of our work comes from recommendations and repeat customers.
Get Your Free Loft Conversion Quote
Ready to unlock the potential of your loft? Get in touch with SBDS Construction Ltd today for honest advice and a free, no-obligation quote.
Urgent enquiry? Call us directly for a fast response.