Top 10 Garden Room Companies in Surrey, Hampshire & Berkshire 2025

Comprehensive review of leading garden room companies serving Surrey, Hampshire, and Berkshire. Criteria: customer reviews (Checkatrade/Trustpilot), portfolio quality, warranty terms (10-25 years), pricing transparency, build timeline, and specialist capabilities (steel-frame, large spans, contemporary design). Featured companies include national brands (Garden Spaces, Rubicon), regional specialists with local planning expertise, and independent builders offering best value. Price ranges: national brands £35k-£80k, regional £28k-£60k, independents £22k-£50k for 4m x 4m room. Key differentiators: some specialize in steel-frame systems (iFrame certified), others in traditional timber, some offer turnkey including electrics/plumbing, others shell-only. Includes what to ask before commissioning: warranty details, payment schedule, planning permission support, and portfolio viewing.