Shed Conversion Across London
Got a tired shed or unused outbuilding sitting at the bottom of the garden? A shed conversion is one of the smartest, most cost-effective ways to gain extra space at home. At SBDS Construction Ltd, we provide complete shed conversion services across London and Essex — transforming cold, damp, forgotten sheds into warm, insulated, fully usable rooms you can enjoy all year round.
As experienced shed conversion specialists in London, our skilled team manages the entire project under one roof: structural repairs, insulation, damp proofing, flooring, electrics, lighting, heating, windows, doors and finishing. We handle every detail 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 project.
From a quiet garden office or home gym to a studio, playroom or garden room, we tailor each conversion to your space, your budget and how you want to use it. Whatever your vision, 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 Shed Conversion Specialists Across London
As an established shed conversion company in London, SBDS Construction Ltd has built its reputation on quality workmanship and reliable delivery. Our shed conversion builders combine practical construction experience with a genuine eye for design, so the finished room is warm, dry, properly finished and genuinely usable — not just a shed with a carpet in it.
When you choose our shed conversion contractors in London, you get qualified, experienced tradespeople, fully insured work, and a team that understands what makes a garden building actually work: proper insulation, effective damp proofing, a sound base, and safe, compliant electrics. Every project is handled end to end by one dedicated point of contact. We are local, we are accountable, and we are here long after the job is done.
What Is A Shed Conversion?
A shed conversion is the process of transforming an existing garden shed or outbuilding into a fully usable, insulated room — such as a home office, gym or studio. It involves upgrading the structure, adding insulation, damp proofing, flooring, electrics, lighting and heating so the space is comfortable to use all year round.
Unlike simply tidying up a shed, a proper conversion tackles everything that stops a garden building being usable: cold, damp, poor light and no power. We strengthen and weatherproof the structure, insulate the walls, floor and roof, install a damp-proof layer, run a safe electrical supply, and finish the interior to the same standard as a room inside your home. Across London — where garden space is often more available than indoor space — shed conversions have become hugely popular, offering a fast, affordable way to gain a whole extra room without extending the house.
Why Invest In A Shed Conversion In London?
With London property prices among the highest in the UK, extending or moving is expensive. A shed conversion creates a genuinely usable extra room for a fraction of the cost of an extension, usually without planning permission, and typically in weeks rather than months — making it one of the best-value ways to gain space.
For many London households, the biggest need is simply somewhere separate: a quiet place to work, exercise or create. A shed conversion delivers exactly that, without losing a bedroom indoors or disrupting your home with a major build. It is far quicker and cheaper than an extension, causes minimal disruption inside the house, and adds a well-presented garden room that appeals strongly to buyers — particularly now that home working is so common. You keep your garden, gain a room, and avoid the stamp duty, fees and stress of moving.
Types Of Shed Conversions We Offer
We convert sheds and outbuildings for almost any use. The right specification depends on how you plan to use the space. Here is a clear guide.
Garden Office Conversion London
Transform your shed into a fully insulated garden office with power, lighting, heating and internet connectivity. Enjoy a quiet, professional workspace away from household distractions, creating the perfect environment for working from home comfortably throughout every season.
Garden Room / Living Space London
Convert your shed into a warm, comfortable garden room for relaxing, entertaining or spending quality family time. Finished to a high standard with insulation and lighting, it provides valuable extra living space without the expense of extending your home.
Home Gym Conversion London
Create a private home gym with reinforced flooring, proper ventilation, lighting and electrical points for your fitness equipment. Enjoy convenient workouts whenever you choose while saving space indoors and eliminating the need for costly gym memberships.
Garden Studio & Workshop London
Turn your shed into a bright, practical studio or workshop designed for creative projects, music, crafts or DIY. With excellent lighting, insulation and power, you'll have a dedicated space that keeps noise and mess outside your home.
Shed Refurbishment & Storage Upgrade London
Refresh your existing shed with structural repairs, weatherproofing, roofing improvements and secure doors. This cost-effective upgrade restores strength, extends the building's lifespan and creates a safe, reliable storage space for tools, equipment and household items.
Garden Annexe / Guest Room London
Upgrade your outbuilding into a premium, fully insulated guest room offering year-round comfort for family and visitors. Finished to a high standard with modern facilities, it adds value and flexibility, while larger projects may require planning approval.
| Conversion Type | Typical Scope | Relative Cost | Timelines |
|---|---|---|---|
| Shed Refurbishment | Repair & weatherproof | £ | 3 - 7 Days |
| Garden Office | Insulated room + power | ££ | 2 - 3 weeks |
| Home Gym | Insulated room + robust floor | ££–£££ | 2 - 3 Weeks |
| Garden Studio / Workshop | Insulated room + lighting | £££ | 2 - 3 Weeks |
| Garden Room | Fully finished living space | £££ | 2 - 4 Weeks |
| Garden Annexe / Guest Room | High-spec, full build standard | ££–£££ | 4 - 8 Weeks |
Benefits Of A Shed Conversion
An extra room
gain usable space without extending your home.
Far cheaper than an extension
A fraction of the cost, for a whole new room.
Fast to complete
most conversions take weeks, not months.
Perfect for home working
A quiet, separate office away from household noise.
Adds property appeal
A finished garden room is a strong selling point.
Warm all year round
Insulation and heating make it usable in winter.
Minimal disruption
The work happens outside, not inside your home.
How Much Does A Shed Conversion Cost In London?
The cost of a shed conversion in London depends on the size and condition of the existing structure, how much repair work is needed, the level of insulation and finish, and whether electrics, heating or plumbing are being installed. Because every shed is different, we provide a free site visit and an accurate, itemised written quote.
The main factors that affect the cost of your shed conversion are:
Size of the shed
Larger buildings need more materials and labour.
Existing condition
A sound structure costs less to convert than one needing repair or a new base.
Insulation & damp proofing
The specification determines year-round comfort.
Electrics & heating
Running a supply from the house and fitting lighting and heating.
Windows & doors
New glazing, French or bifold doors add cost and light.
Interior finish
Flooring, plasterboarding, decoration and any fitted furniture.
Rather than guess, we give you a clear, itemised quote so you know exactly what you are paying for.
Our Shed Conversion Process
1
Consultation
We discuss how you plan to use the space, your requirements and budget to recommend the most suitable shed conversion solution.
2
Survey
We inspect the shed's structure, base, condition and site access to identify any repairs or upgrades required.
3
Design
We create the layout, plan insulation, electrical installation, windows, doors and interior finishes to suit your needs.
4
Preparation
We carry out structural repairs, strengthen the building, improve weatherproofing and ensure the base is dry, stable and ready.
5
Waterproofing
We install high-quality insulation to the walls, floor and roof for comfortable year-round use and improved energy efficiency.
6
Electrics
We install a safe electrical supply, sockets, lighting, heating connections and data points where required.
7
Installation
We fit new windows, secure doors, flooring, wall linings and any built-in storage or furniture.
8
Finishing
We complete plastering or panelling, decorating, painting and all final details for a polished appearance.
9
Completion
We carry out a final inspection, ensure everything meets our quality standards, hand over the finished space and provide your warranty.
Shed Conversion Timeline
Every project is different, but a typical garden office or garden room conversion in London runs to roughly this schedule:
Days 1–2
Clearance, survey checks and structural repairs.
Days 3–4
Base works, damp proofing and weatherproofing.
Days 5–7
Insulation to walls, floor and roof.
Days 8–9
Electrical first fix — supply, sockets, lighting and data.
Days 10–11
Windows, doors and any external finishing.
Days 12–13
Interior boarding, flooring and second-fix electrics.
Day 14
Decoration, final finishing and handover.
Most conversions take around two to three weeks; simple refurbishments are quicker and high-specification garden rooms take longer. We confirm a realistic schedule in your quote.
Do You Need Planning Permission For A Shed Conversion In London?
Usually not. Garden outbuildings normally fall under permitted development, provided they are single storey, no more than 2.5m to the eaves, no more than 4m high overall (3m for a flat or single-pitch roof), and used for purposes incidental to the home — such as an office, gym or studio. Under permitted development rules for outbuildings, key limits generally include: single storey only; a maximum eaves height of 2.5 metres; a maximum overall height of 4 metres for a dual-pitched roof or 3 metres for other roof types; and — importantly — a maximum total height of just 2.5 metres if the building sits within 2 metres of a boundary. Outbuildings must also not sit forward of the principal elevation, must not include verandas or raised platforms above 0.3m, and together with other buildings must not cover more than 50% of the land around the original house. The key legal test is that the building must be "incidental to the enjoyment of the dwellinghouse." An office, gym, studio or garden room is normally fine. However, creating self-contained living accommodation — an annexe with its own sleeping, kitchen and bathroom facilities for independent living — is not incidental and will normally require planning permission. You may also need permission if the property is a listed building, sits in a conservation area or on designated land, or is subject to an Article 4 direction. We assess your property and handle any application for you. Always confirm requirements with your local planning authority before starting work.
Why Choose SBDS Construction?
When you trust us with your shed conversion, you get a team that treats your property as if it were our own:
Experienced team with proven shed and outbuilding conversion expertise
Local London builders who know the planning rules for garden buildings
Proper insulation and damp proofing — a room that is genuinely usable all year
Transparent pricing with clear, itemised written quotes
Dedicated project manager as your single point of contact
Fully insured work (confirm details on your site)
Excellent reviews — 5.0 stars from 55 Google reviews
Excellent reviews — 5.0 stars from 55 Google reviews
Shed Conversion Ideas
Not sure how to use your new space? A converted shed can become almost anything:
- Home Office
- Home Gym
- Art or Music Studio
- Workshop
- Garden Room
- Playroom
- Home Bar
- Reading Room or Library
- Yoga & Meditation Space
- Hobby Room
- Home Cinema
- Guest Room
Whatever you have in mind, we will help you design a space that fits your lifestyle and makes the most of your garden.
Areas We Cover Across London
We convert sheds and outbuildings right across London and the surrounding areas, bringing local knowledge to every project.
- Shed Conversion in North London
From compact terraced gardens to larger family plots, we convert sheds across North London into warm, usable rooms.
- Shed Conversion in South London
We help South London homeowners turn tired garden buildings into offices, gyms and garden rooms.
- Shed Conversion in East London
As a Chadwell Heath–based company, East London is our home turf. We know the properties and gardens here inside out.
- Shed Conversion in West London
We deliver high-specification garden offices and garden rooms across West London.
- Shed Conversion in Central London
We carry out carefully managed conversions in Central London, working within access and space 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 Shed Conversion Projects
Take a look at some of our recent shed and garden room 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 shed conversion transforms an existing garden shed or outbuilding into a fully usable, insulated room — such as a home office, gym or studio — with damp proofing, flooring, electrics, lighting and heating.
Usually not. Garden outbuildings normally fall under permitted development if they are single storey and within the height limits, and used for purposes incidental to the home. Self-contained living accommodation does require permission.
The cost depends on the size and condition of the shed, the insulation and finish, and whether electrics and heating are installed. We provide a free survey and an accurate, itemised written quote.
Most garden office and garden room conversions take around two to three weeks. Simple refurbishments are quicker and high-specification builds take longer.
Most sheds can, provided the structure and base are sound or can be repaired. We assess this during the survey and advise honestly if a rebuild would be the better option.
Yes. We insulate the walls, floor and roof and can install heating, so the room is comfortable to use all year round.
Yes. We run a safe, armoured supply from the house and install sockets, lighting and data. Electrical work in outbuildings is notifiable under Part P and is fully certified.
It depends on size and use. Outbuildings under 15m² without sleeping accommodation are generally exempt, and 15–30m² may be exempt subject to conditions. Any sleeping accommodation always requires approval.
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 Shed Conversion Quote
Ready to turn your shed into a room you will actually use? Get in touch with SBDS Construction Ltd today for honest advice and a free, no-obligation quote.