JR General Building
Bespoke Garden Rooms
Your space. Your escape.
Whether you're creating a peaceful garden retreat, a garden office, a gym or an entertainment space, JR General Building designs and builds bespoke, fully insulated garden rooms tailored to your lifestyle.
Call 07450 015 853- Credential 01
SMAS Worksafe
SMAS Worksafe accredited
- Credential 02
Marshalls Approved
Marshalls Approved Installer
- Credential 03
City & Guilds
City & Guilds qualified bricklayers
- Credential 04
CSCS Registered
CSCS registered crews
Bespoke garden rooms in Milton Keynes
A garden room is the fastest way to add genuinely usable space to your home — a quiet garden office, a studio, a gym or a calm retreat — without extending the house or losing a bedroom. Because it sits in the garden, disruption is minimal and most builds are quick.
JR General Building designs and builds bespoke, fully insulated garden rooms across Milton Keynes and the Home Counties — built on proper foundations, wired, heated and finished for comfortable use all year round.
Extra space
Extend your living space into the garden
A well-built garden room creates valuable additional space without changing your existing home, and without the cost of a full extension.
Every project is designed around how you want to use the building, so it complements both your property and your garden.
Use your garden room as a
- Garden office
- Studio
- Home gym
- Hobby room
- Entertainment space
- Guest room
Not just for summer
Insulated and finished for year-round use
A cheap flat-pack kit is cold by October. Ours are built like a small house — insulated walls, floor and roof, proper glazing, electrics and heating — so the space is just as usable in January as in July.
Whether it becomes a garden office you work in every day or a room to relax in, it's built to be warm, quiet and dry.
Built in as standard
- Insulated walls, floor and roof
- Double-glazed windows and doors
- Power, lighting and data
- Heating options
- Quality internal finish
- Durable, low-maintenance cladding
Bespoke build
Built around your requirements
Every garden room is bespoke — the result is a building that's practical, attractive and built to last.
We can provide
- Groundworks
- Concrete bases
- Brick or timber construction
- Insulation
- Roofing
- Doors and glazing
- Electrical installation
- Heating options
- Internal plastering and finishes
- External landscaping
Usually not needed
Planning permission for garden rooms — usually not needed
Most garden rooms are built under permitted development as outbuildings, so they don't normally need planning permission — provided they stay within the size, height and position rules and aren't used as self-contained living or sleeping accommodation.
Rules are tighter in conservation areas, on listed properties and near boundaries. We check your site's position and design to stay within permitted development wherever possible — or help with an application if you'd prefer something larger.
Your space. Your escape.
Design, build and transform — all under one roof, with our own trades on every project.
Compare
Flat-pack kit or bespoke garden room?
Garden rooms are often sold as "summer houses" — a term that covers everything from a timber kit to a fully insulated building. Here is the difference that matters.
We build proper, insulated garden rooms — whatever you choose to call them.
Cost & quotes
What affects the cost of a garden room
Every garden room is bespoke, so we design and quote to your brief. The main factors are:
We give you a clear written quote after a free design visit — no pressure and no vague phone estimates.
What affects the price
- Overall size and shape
- Insulation and glazing specification
- Bi-fold or French doors
- Electrics, lighting, heating and data
- Plumbing, if you want a WC or kitchenette
- Foundations and ground conditions
- Cladding and internal finish
- Any landscaping or access work
Our process
How your garden room is built
Designed around your garden, built by our own team.
- 01
Design consultation
We visit your garden, discuss how you'll use the room and agree a size, layout and specification.
- 02
Base & groundworks
We prepare proper foundations or a base suited to your ground — the part cheap builds skip.
- 03
Build & weatherproof
Structure, insulation, cladding, roof, doors and glazing — made watertight quickly.
- 04
Fit-out & finish
Electrics, heating, internal finishes and any landscaping, ready to use.
The JR difference
Why choose JR General Building?
Our reputation has been built on delivering quality workmanship with honest advice and clear communication throughout every project.
- Fully insulated, year-round buildings
- Proper foundations, not slabs
- In-house groundwork and trades
- Complete project management
- Transparent quotations
- A professional, lasting finish
FAQs
Garden room questions, answered
What people ask us most before adding a garden room.
Do I need planning permission for a garden room?
Most garden rooms are built under permitted development as outbuildings and don't need planning permission, as long as they meet the size, height and position rules and aren't used as self-contained sleeping accommodation. Conservation areas, listed buildings and boundary distances can change this — we check your site before designing.
Can I use a garden room all year round?
Yes. We insulate the walls, floor and roof, fit double glazing and install heating and power, so the room stays warm and dry through winter — ideal for a garden office or gym.
What's the difference between a garden room, garden office and summer house?
They're all buildings in the garden — the difference is the specification. Ours are bespoke, fully insulated garden rooms, so whether you call it a summer house, garden office or studio, it's built for real, year-round use.
How long do garden rooms last?
A well-built, properly founded garden room lasts for decades. We build on proper foundations with quality, low-maintenance materials, rather than a timber kit on paving slabs.
Can I have a bathroom or kitchenette in my garden room?
Yes. We can add plumbing and drainage for a WC, shower or kitchenette. Adding facilities can affect the planning position, which we'll advise on.
Timber or brick — what are my options?
Both. We build timber-framed and clad garden rooms as well as brick and blockwork buildings, depending on the look, budget and how you will use the space.
Do you build the base and foundations?
Yes. Groundworks are one of our core trades, so the base is designed for your ground conditions and built by the same team — not subcontracted or skipped.
How long does it take to build a garden room?
Most garden rooms take a few weeks on site once the base is in. We give you a clear programme with your quote.
Can it be used as a home office, gym or guest room?
Yes — offices, studios, gyms, hobby rooms and guest space are the most popular uses. Using it as permanent sleeping accommodation has planning implications, which we'll explain.
Do garden rooms need building regulations approval?
Many garden rooms are exempt from Building Regulations when they're under 15 m² of internal floor area. Between 15 and 30 m² they're usually still exempt if they sit at least a metre from the boundary or are built from non-combustible materials, and anything over 30 m² — or used for sleeping — needs approval. We build to the right standard for your size and confirm the position for your project.
How well insulated are your garden rooms?
We insulate the walls, floor and roof and fit double-glazed doors and windows, so the building performs like a warm, year-round room rather than a summer-only shed. Upgraded glazing and heating options are available for garden offices and gyms that are used every day.
Can a garden office be soundproofed?
Yes. For a garden office, studio or music room we can add acoustic insulation and upgraded glazing to reduce noise both ways — so you can work undisturbed and neighbours aren’t affected either.
Do you handle the electrics and heating?
Yes. Power, lighting, data and heating are all part of the build, so the room is ready to use on handover.
Create your ideal garden space
Whether you're looking for a modern garden office or a relaxing retreat, we'll help bring your ideas to life. Arrange your free design consultation today.
Where we work
Based in Milton Keynes. Covering Milton Keynes and the Home Counties.
From the MK borough — Bletchley, Stony Stratford, Wolverton, Newport Pagnell — out to Bedford, Northampton, Aylesbury, Luton, Watford and Greater London. If you're unsure whether you're in our area, please call — we usually are.
Primary towns
- Buckinghamshire
- Bedfordshire
- Northamptonshire
- Hertfordshire
- Greater London
Surrounding towns
- Stony Stratford
- Wolverton
- Bletchley
- Newport Pagnell
- Cranfield
- Olney
- Towcester
- Buckingham
- Leighton Buzzard
- Northampton
- Bedford
- Aylesbury
- Luton
- Hemel Hempstead
- Watford
- London
Map centred on Milton Keynes — coverage radiates across Buckinghamshire, Bedfordshire, Northamptonshire, Hertfordshire and into Greater London.