Garden Rooms · Manchester & Greater Manchester
Garden Rooms In
Manchester — Built To
Use Year-Round.
Insulated garden rooms, home offices, gyms and studios across Greater Manchester — built on site from foundations up, full electrics from the house, year-round usable. Fixed-price contract.
FMB Member · Fully Insured (£2m PL & EL) · Fixed Written Quotes
Service Overview
Garden Rooms —
The Brief, In Plain English.
What It Is
A built-on-site garden room — concrete or screw-pile foundation, insulated timber frame, breathable membrane, larch / cedar / composite cladding, EPDM warm-roof, triple-glazed door and windows, mains electrics on a dedicated circuit from the house consumer unit, internal plaster or panel finish, heating sized for the floor area.
Who It's For
Homeworkers needing a real office with the door that closes; anyone wanting a gym, yoga studio, painting / music space or teenager's den; clients adding lettable annexe space (Permitted Development limits apply); families wanting more usable square metres without the cost or planning of an extension.
When You Need It
When the kitchen table office isn't working any more, when the garage is full, or when the spare room has become a bedroom and there's nowhere else for the home gym. Built any time of year — winter slows the foundation pour but rarely stops it.
Why It Matters
Garden rooms either become the most-used room in the property or rot in the corner of the garden inside five years. The difference is the build spec: proper foundation, full insulation envelope, EPDM warm roof, mains electrics — not a glorified shed with a heater.
What Happens If You Wait
The Cost Of
Doing Nothing.
Cheap garden rooms fail predictably. The roof leaks at the parapet, the floor goes cold, the cladding twists, and the electrics were always undersized.
Risks Of Ignoring It
- →Single-skin uninsulated build — usable in summer, unusable November to March.
- →Felt or torch-on roof on a flat deck without falls — pools water, fails in three winters.
- →Cladding fitted direct to sheathing with no ventilation cavity — moisture trapped, boards rot from behind.
- →Spur off a 13A socket for power — trips constantly under heater or PC load, no certificate.
- →No DPC or insulated floor — cold strikes up, condensation under furniture.
Common Mistakes Customers Make
- ×Buying a flat-pack from the cheapest online supplier and self-erecting — site spec rarely matches PD rules.
- ×Going under-spec on insulation to save a few hundred pounds — costs more in heating across one winter.
- ×Skipping the dedicated circuit from the consumer unit — power problems forever.
- ×Building closer than 2m to the boundary with combustible cladding — Permitted Development breach.
Our Process
First Call To
Final Sign-Off.
01
Survey & Feasibility
Site visit, position planning (PD volume / boundary distances), services routing from the house, foundation choice for ground conditions.
02
Design & Fixed Quote
Spec written against use case (office / gym / studio), itemised written quote, programme attached.
03
Foundations & Frame
Concrete pad, ring beam, raft slab or screw piles depending on ground; insulated timber frame erected on a level base.
04
Envelope & Services
EPDM warm roof, breather membrane, ventilated cladding cavity, cladding, triple-glazed door and windows, mains electrics on dedicated circuit from house consumer unit.
05
Finish & Sign-Off
Internal insulation, vapour barrier, plaster or panel finish, flooring, second-fix electrics with NAPIT certificate, contract guarantee in writing.
Credentials
What Stands
Behind The Work.
Fully Insured
£2m public liability and £2m employers' liability cover.
FMB Members
Federation of Master Builders — verified profile.
Structural Work In-House
Carried out by Ultra Build's own team — not subcontracted out.
Garden & External Works
Handled in-house alongside the main build.
NAPIT-Registered Electricians
Electrical work carried out by our NAPIT-registered specialist subcontractors, with certification on completion.
Gas Safe-Registered Engineers
Gas work carried out by our Gas Safe-registered specialist subcontractors, with certification on completion.
The Team
Around 7 full-time staff, and 20+ including long-standing subcontractors we've worked with for 5+ years.
Why It's Worth It
What You
Actually Get.
Usable Year-Round
Insulation envelope and triple glazing specced for UK weather — warm in winter, cool in summer, dry in autumn.
Mains Electrics On Dedicated Circuit
Wired back to the house consumer unit on its own RCD-protected circuit by a NAPIT-registered specialist — certificate issued.
EPDM Warm Roof
Single-piece EPDM rubber with proper falls — no felt seams, 20+ year material warranty.
Ventilated Cladding
Larch, cedar or composite cladding on a ventilated cavity — boards stay dry, finish lasts.
Fixed-Price Only
Written quote against your spec.
Workmanship Guarantee
Up to 5 years on internal renovation defects, written into the contract.
Workmanship Guarantee
Written Into
The Contract.
Every Ultra Build Northwest contract carries a workmanship guarantee in writing. It covers defects with the structural build and plumbing issues such as faulty fittings — not just a verbal promise.
10
Years
On Roofs
2
Years
On Extensions
Up To
5
Years
On Internal Renovation Defects
In Detail
Garden Rooms —
Every Variation Covered.
Materials, methods and the situations each variation applies to — so you know what you're buying before you buy it.
Working across
Manchester · Cheshire · Oldham · Salford · Stockport · Alderley Edge · Altrincham & Hale
Full Service Area MapHome Office Garden Rooms
The most common build — typically 3m x 4m, fully insulated, mains electrics, data run from house, heating sized for the floor area. Built to use 8 hours a day, 5 days a week, every week of the year.
Garden Gyms & Studios
Reinforced floor for racks and free weights, electrics sized for treadmills / cable machines, mirror wall, ventilation specced for sweat and moisture. Studios for yoga, music, painting and dance all built to the same standard.
Annexes & Multi-Generational Use
Larger garden rooms with kitchenette and shower room — note Permitted Development limits on independent living. We tell you straight at feasibility what's permissible without full planning.
Foundations & Site Conditions
Concrete pad and ring beam for typical Manchester clay; screw piles on tree-root influence zones or for minimum-impact installation; raft slab on softer ground. Engineer's design where the site warrants it.
Permitted Development & Planning
Most garden rooms fall under Permitted Development — height limits, volume limits and boundary distances apply. Lawful Development Certificate strongly recommended for resale. We confirm at survey.
Questions
Straight
Answers.
Cost, timeline, guarantees, lifespan, emergency availability — the questions everyone asks, answered before you call.
Ask YoursHow much does a garden room cost in Manchester?
+
Greater Manchester 2026: typical 3m x 4m insulated garden office £18,000–£28,000 including foundation, mains electrics and finished interior. Larger or higher-spec studios £28,000–£45,000. Fixed itemised written quote.
Do I need planning permission?
+
Usually no — most fall under Permitted Development (height under 2.5m within 2m of boundary, volume limits, no sleeping accommodation as independent dwelling). A Lawful Development Certificate is recommended for resale. We confirm at survey.
How long does it take to build?
+
Typically 3–5 weeks from foundation to handover, depending on size, cladding and ground conditions.
Can you wire it into the house properly?
+
Yes — dedicated circuit from the house consumer unit, RCD-protected, armoured cable run buried to depth, NAPIT-registered specialist with certificate issued on completion.
Is it warm enough to use in winter?
+
Yes — full insulation envelope (floor, walls, roof), triple-glazed door and windows, heating sized for the floor area. Most clients use a panel heater or air-con as the heat source.
Can I have a toilet or kitchenette in it?
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Yes — drainage and water run from the house, tanked wet zone, certified electrics. Note that adding sleeping accommodation with full kitchen and bathroom can take the building out of Permitted Development.
Do you guarantee the work?
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Yes — up to 5 years on internal renovation defects, written into the contract. EPDM roof carries a 20+ year material warranty.
Do you cover all of Greater Manchester and Cheshire?
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Yes — Manchester, Salford, Stockport, Trafford, Cheshire and surrounding towns.
What cladding options do you offer?
+
Larch (silvers naturally), cedar (warm tone, holds colour with treatment), composite (low-maintenance), painted timber. We show samples at survey.
Next Step
Build The Room You Actually Need.
Free site survey across Greater Manchester, fixed written quote — no obligation. FMB member, fully insured with £2m public liability and £2m employers' liability, Manchester-based.
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