Extensions & garden rooms
Warm-roof packages for modern extensions, garden rooms and compact domestic projects.
Dorset · Hampshire · Southern England
Single-ply roofing,
built around the detail.
Specialist membrane roofing for extensions, new builds, refurbishments and commercial projects—installed by an experienced team approved across three leading systems.
Anthony's Avenue / Lilliput, Poole17years combined experience
3approved membrane systems
25year warranties available
Single-ply specialists
A high-performance roof is only as good as its details.
Single-ply is at the centre of what we do. We install complete warm-roof and membrane waterproofing packages, with close attention to vapour control, insulation, falls, fixings and every junction that keeps the roof performing properly.
That same care carries through rooflights, outlets, box gutters, parapets, penetrations and interfaces with adjoining roof coverings. We work from plans or visit site, identify potential issues early and set out a clear specification before installation begins.
Where it works
One material.
Many applications.
The right membrane, fixing method and build-up depend on the project. We provide a practical specification that fits the roof design rather than treating every job the same.
New builds
Single-ply systems coordinated with the wider roof package, programme and adjoining trades.
Commercial roofing
Dependable membrane installations for larger roof areas, multiple outlets and detailed layouts.
Re-roofing & overlays
Carefully assessed refurbishment options, including compatible overlay systems where the existing build-up allows.
Approved installation
Specified for the roof.
Installed to the system.
As approved contractors for Alwitra, Siltec and Protan, we can recommend a system around the substrate, roof geometry, programme and required finish. Depending on the specification, membranes can be mechanically fixed, bonded or self-adhered.
- Complete warm-roof build-ups
- Rooflights, upstands, outlets and box gutters
- Compatible refurbishment and overlay solutions
- Manufacturer-backed warranties up to 25 years
Approved systemsALWITRASILTECPROTANSystem choice is confirmed against the individual roof specification.
Project evidence
Recent single-ply
in practice.
Two different residential projects showing how the membrane work is adapted to the roof, surrounding construction and level of detailing required.
Lilliput, Poole
Anthony's Avenue extension
A mechanically fixed Siltec warm-roof installation incorporating a vapour-control layer, 150mm insulation, two rooflights, two box gutters, outlets and carefully formed parapet details.
Residential new build
Corfe Way
A live new-build project where the flat-roof waterproofing had to coordinate cleanly with rooflights, pitched roof areas and perimeter junctions. Early detail review and sequencing helped keep the different roof elements working together.
Common questions
Before you specify
single-ply.
What is single-ply roofing?+
Single-ply roofing uses a flexible, purpose-made membrane to waterproof flat and low-pitched roofs. It is well suited to extensions, new builds, commercial roofs and refurbishment work because it can be formed neatly around rooflights, outlets, gutters and upstands.
Which single-ply systems do Monos install?+
Monos Roofing is an approved contractor for Alwitra, Siltec and Protan. We select the system and fixing method around the roof design, substrate, build-up and manufacturer requirements.
Are warranties available?+
Manufacturer-backed warranties of up to 25 years are available on suitable specifications, including IBW options. The warranty offered depends on the selected system and project requirements.
Where do you install single-ply roofs?+
We are based in the Bournemouth and Poole area and regularly work across Dorset and Hampshire, including Ringwood and Southampton. We also travel across southern England for the right project.
Planning a single-ply roof?
Send us the plans.
We'll handle the detail.
Share your drawings, measurements or site photographs. We aim to respond to every enquiry within 24 hours.