21 Degrees Doncaster | Formerly Green Building Renewables
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Claim This ListingSolar installer 21 Degrees Doncaster | Formerly Green Building Renewables operates from Sheffield, covering South Yorkshire for residential and small-commercial solar panel installation jobs.
The 21 Degrees Doncaster | Formerly Green Building Renewables website (21degrees.com) positions the business as: “We are proud to have received a number of awards and accolades over our years of experience.”
Their Google business listing carries 13 reviews at 4.7★ — enough to spot patterns. Ask for two recent customer references before booking.
Verify 21 Degrees Doncaster | Formerly Green Building Renewables’s credentials before paying a deposit: MCS Certified for installer accreditation, RECC or HIES for consumer protection scheme membership, and Companies House for current trading status. EnergyRanked surfaces public signals but does not vet credentials on your behalf.
21 Degrees Doncaster | Formerly Green Building Renewables’s listed address: Unit 20, Guildhall Industrial Estate Sheffield DN3 1QR.
Verify before you sign: MCS register · RECC · HIES · Companies House
Services Offered
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Frequently asked questions
Are there other solar installers in Sheffield I should compare?
Yes — three quotes is the UK standard. Use EnergyRanked's Sheffield filter to compare 21 Degrees Doncaster | Formerly Green Building Renewables against other local installers on rating, review count, and accreditation. Don't just chase the cheapest quote; compare warranty terms and brand specs side-by-side.
Does 21 Degrees Doncaster | Formerly Green Building Renewables offer Insurance Backed Guarantees (IBG)?
An IBG is essential — it covers the workmanship warranty if the installer ceases trading. MCS-certified installers usually offer IBG via the MCS scheme. Confirm 21 Degrees Doncaster | Formerly Green Building Renewables provides an IBG certificate at handover; don't accept a workmanship guarantee that's only as good as the installer's continued existence.
When is the best time to book a solar install with 21 Degrees Doncaster | Formerly Green Building Renewables?
Demand peaks April–August across the UK. Booking in autumn or winter often means shorter waits and sometimes pricing flexibility. Installation itself is a year-round activity in most UK weather — the constraint is scheduling, not the season.
What questions should I ask 21 Degrees Doncaster | Formerly Green Building Renewables before booking a survey?
Key questions: panel and inverter brands (and warranties for each); installer MCS number; expected install lead-time; deposit terms and refund policy if cancelled before survey; who handles the DNO application; and roof/structural inspection responsibility. 21 Degrees Doncaster | Formerly Green Building Renewables should answer all of these without hesitation.
Is 21 Degrees Doncaster | Formerly Green Building Renewables MCS Certified for solar PV?
MCS certification is the industry standard for UK solar installers. Check the live MCS register at mcscertified.com — search by company name. If 21 Degrees Doncaster | Formerly Green Building Renewables is currently MCS Certified, their name and certificate number will appear. If not listed, ask why.
Unit 20, Guildhall Industrial Estate
Sheffield DN3 1QR
United Kingdom
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