How we chose
We started from the garden room builders Google Maps shows across Telford. Scheme memberships were sourced from the issuing registers and each firm's own website [3] [4] [5]. Each business must first meet our basic checks: it is who it says it is, it is trading today and can be reached, and anything it must hold by law is in place, with no trade registration mandatory for garden rooms. All eight firms met all three. What customers say counts most toward the score, then qualifications, then whether the firm has traded for two years or more and whether its cover is stated, then pricing clarity and website detail. All evidence is dated September 2026.
How to hire
Start with planning permission, because it decides what you can build. Most garden rooms count as permitted development and need no application, provided the building sits behind the front wall of the house, stays single storey with eaves no higher than 2.5 metres, keeps within the height limit for its distance from the boundary, and covers no more than half the garden with everything else built around the house [1]. The room must stay incidental to the house: a home office passes, while self-contained living accommodation does not [1]. Listed buildings and conservation areas play by different rules, so check with Telford and Wrekin Council before you order [1].
Building regulations usually stay out of small detached rooms: below fifteen square metres needs no approval, and rooms up to thirty square metres escape it too where nobody sleeps overnight and the building stands clear of the boundary or is built substantially from non-combustible materials [2]. The wiring gets no such pass. Electrical work in the room must comply, so ask who does it and check the name or number yourself on the NICEIC or NAPIT register rather than trusting a logo on a van [3] [4]. A scheme member can self-certify the work instead of going through building control [7]. Ask which certificate you will receive for the new circuit before work starts.
No single trade register covers garden room builders, so judge competence from voluntary proof. Federation of Master Builders lists builders whose work is inspected [5], and TrustMark is the government-endorsed scheme for work in and around the home [6]. Only Rubik Builders in this round holds either on the record. For everyone else, weigh recent room photos, case studies and the electrician's scheme number, and check each claim yourself on the register before you book [3] [4].
Get three written quotes on the same scope, which is TrustMark's standing advice before any home job [6]. Each quote should separate the base and groundworks, the building shell, insulation, glazing, electrics, heating and decoration, with labour, materials and VAT shown apart, plus start and finish dates and payment stages [6]. A deposit for materials is normal, while full payment before completion is not [6]. Confirm whether the headline price is turnkey or leaves the base, the wiring and the decorating out, since those extras decide the real comparison.
Agree the unglamorous extras in writing. Ask who removes spoil, offcuts and packaging, and check the carrier on the Environment Agency public register of waste carriers [10]. Ask for the insurance detail in writing too: only the top firm in this round publishes amounts, so for the rest a certificate with the quote tells you more than a line on a website. Always use a written contract naming what will be done, when and for how much, and agree any change in writing as well [6].
At the end, collect the paperwork before you pay the balance: the electrical certificate for the new circuit with the building-regulations notification where the self-certification route applies [7], the written warranty with its exact terms and who honours it, and the final invoice matching the quote. Photograph the finished room, the consumer-unit labels and any marks on paths or fences, and file everything with the house papers, since you will need it when you sell or let. If a dispute survives the firm's own complaints route, Citizens Advice sets out your consumer options [11].
Pricing
As of autumn 2026, rough Telford ranges run like this: a self-assembly mini garden room £2,500–£8,000, with professional assembly around £1,250 on top; a small insulated office assembled £3,200–£7,800; a home office pod £3,500–£20,000 [8]. Those Checkatrade figures were updated in spring 2026 and describe typical UK prices [8]. List prices are rare in this round: only Shed City prices its rooms per model, including a composite garden room reduced from £8,920.
Size and year-round spec move the price most: insulation, double glazing, heating, electrics and any plumbing each add a layer, and electrical and decorating time is typically charged by the hour [8]. Groundworks and the base are often quoted apart from the headline figure, so confirm exactly what your quote includes before you compare prices.
Ask whether VAT sits inside or on top of the figure: the standard rate is twenty per cent [9], and only Shed City in this round publishes a VAT number, so for every other quote confirm the VAT position in writing before you agree anything.
Get the scope in writing before work starts, which base, building, wiring, heating and finishes are included, what changes the price if the ground proves worse than expected, and payment stages tied to finished work. Agree the warranty terms alongside the price, and keep every quote, invoice and certificate together [6].
Red flags
Quotes a bespoke room without visiting the garden or asking for measurements, photos and access detail.
Cannot name who certifies the electrical work or give a scheme number you can check on the NICEIC or NAPIT register [3] [4].
Starts work with no written contract naming the scope, price and dates [6].
Asks for full payment before completion, where a deposit for materials is the normal limit [6].
Gives one fixed price with no breakdown of base, building, electrics and VAT [8].
Waves away planning and building-regulations checks instead of measuring the room against the limits [1] [2].
Hauls spoil and packaging away with no waste carrier detail you can check on the public register [10].
Will not put the warranty terms and the aftercare route in writing.
The bottom line
For most people, start with Rubik Builders: registered memberships on the record, stated insurance with amounts, and retrofit, electrics and improvements under the same roof. Its site shows little garden-room detail and no prices, so ask for room examples and an itemised quote before you go further.
For particular needs, pick Shed City to compare buildings in person and buy at a listed price, or Custom Garden Rooms for a bespoke room or annexe quoted to measure. Noah suits an online design route with installation by its own team.
Then ask each shortlisted firm for the same written scope, proof of cover and warranty terms, and compare the quotes line by line before you pay anything.
Corrections and business responses
Tell us what needs checking, or ask to claim a listing and reply to an assessment.