Knowledge Hub / FAQs & Resources
FAQs & Resources
Costs, timescales, finance and foundations — straight answers to the questions we’re asked most, so you can plan your project with confidence.
- West Midlands
- 20+ years' experience
- Fixed, itemised quotes
Quick answers
How much does an Oaklight garden room cost?
Our four standard CoreBuild™ designs have guide prices from £14,500 for the 3 × 3m Compact Escape to £28,080 for the 6 × 3m Multi-Purpose Retreat, fully installed. Every build is confirmed with a fixed quote after a site survey. See the full breakdown on our Price Guide.
How much does a home extension cost?
Our single-storey rear extensions start from around £35,000, with side return, build-over and two-storey extensions priced from there. See our extension guide prices.
How long does a garden room take to build?
Most garden rooms take 4–6 weeks on site, and around 8–12 weeks from first enquiry to handover once the survey and design stages are included. Read the full timeline.
Do I need planning permission?
Most garden rooms are built under permitted development, so they don’t need planning permission, as long as they meet the size, height and position rules. We check your plot at the site survey. Read our planning guide.
What warranty do you offer?
Every Oaklight garden room comes with a 10-year structural warranty and CareCover™ aftercare support. See what’s included.
Which areas do you cover?
We design and build garden rooms and home extensions across the West Midlands.
In-depth guides
How much does a garden room cost in 2026?
Typical UK price ranges, what drives the cost, and our current guide prices.
Garden room cost per square metre
Why smaller rooms cost more per m², and why specification matters more than size.
Garden room vs conservatory vs extension
How the three compare on cost, disruption, approvals and build time.
Can you get finance for a garden room?
The common ways people spread the cost, and what to check before you commit.
How long does it take to build a garden room?
The full timeline, stage by stage, from first enquiry to handover.
Garden room foundations explained
Concrete, ground screws and slabs compared — and why we build every room on concrete.
More resources: Price Guide · Our Process · Features & Options · Warranty & Aftercare · Legal & Compliance
Still have a question?
Ask us anything — we’ll give you a straight answer, and a fixed quote after a free site survey if you’d like one.
