Your Own Private Retreat, Just Steps From Your Back Door
Fully Insulated. Bespoke. Installed In Days.
Premium garden rooms built using SIPs or bespoke traditional construction — ground screw foundations, 100mm Rockwool insulation, and a 10-year guarantee. No planning permission needed for most builds.
Your Own Private Retreat, Just Steps From Your Back Door
Fully Insulated. Bespoke. Installed In Days.
Premium garden rooms built using SIPs or bespoke traditional construction — ground screw foundations, 100mm Rockwool insulation, and a 10-year guarantee. No planning permission needed for most builds.
Design Your Garden Room In 3D & See Your Price Instantly
Choose your size, cladding, doors, windows, and extras — see it all come together in real time
No obligation • No hard sell
Why Choose LouMil?
We don't cut corners. Every garden room we build uses premium materials, our proprietary build system, and is backed by a 10-year guarantee.
100mm Rockwool Insulation
Every build uses 100mm Rockwool insulation as standard — keeping your room warm in winter and cool in summer.
SIPs or Bespoke Build
Choose from our SignatureSIPs™ panel system for rapid, airtight construction — or a fully bespoke traditional build tailored to your exact specification.
10-Year Structural Guarantee
Every garden room comes with a comprehensive 10-year guarantee. We stand behind every build we do.
Installed In As Little As One Week
From ground screws to handover, most builds are complete in 5–7 working days. No foundations, no mess.
Completely Bespoke To You
Every room is designed to your exact requirements — size, layout, cladding, doors, windows, electrics, and more.
5-Star Rated On Google
Don't just take our word for it. Our customers consistently rate us 5 stars for quality, communication, and value.
Design Your Garden Room In 3D
Choose your size, cladding, doors, and extras — see your price in real time
No obligation • No hard sell
What Our Customers Say
"Great service and top-quality garden room. The team was professional and customised everything to my needs. Couldn't be happier with the result."
— Charlotte Adams
"Excellent service from Ricky and his team. I had build a 4m x 2.5m garden office with a small 1m storage space for my semi-detached home. Pretty quickly done with and was customisable based on my requirements."
— Harish Sukumaran
"LouMil built our garden office and we couldn't be happier. The whole build was fast, professional and the room is warm even in winter. Highly recommend."
— James Carter
Ready To See Your Garden Room In 3D?
Enter your details, design your bespoke garden room, and see exactly what it will cost — no obligation.
No obligation • Takes 60 seconds • Accurate pricing