Metal Roofing for Extensions
Zinc, aluminium, and single-ply roofing systems for residential extensions — flat roof extensions, single-storey, and wrap-around.
Extensions are one of the most common projects we work on. Getting the roofing specification right at design stage makes the installation straightforward and avoids problems at the junctions where the extension meets the existing building. We are happy to engage early — including directly with architects — before the spec is finalised.
Zinc standing seam and aluminium systems are particularly well-suited to extension work, offering clean lines and a lifespan that will outlast the building. Single-ply membrane is a practical and cost-effective option for flat roof extensions where a metal finish is not required.
Planning requirements vary depending on the property and location. We can advise on what falls within permitted development and flag anything that may require formal consent before you commit to a material or specification.
We work on single-storey and two-storey extensions, flat roof extensions, and wrap-around extensions across London and the South East. Contact us early and we can provide costs for different material options to help inform the decision.
Frequently asked questions
What is the minimum pitch for a metal roof on an extension?
Standing seam zinc and aluminium systems can be taken down to 1.5–2 degrees with the correct detailing and drainage design. Single-ply membrane is suitable for flat and near-flat applications. The minimum pitch affects the choice of material, the drainage strategy, and the detailing at junctions and upstands — all of which we advise on at specification stage.
Does an extension roof need planning permission?
Most single-storey extension roofs fall within permitted development, but there are exceptions — particularly in conservation areas, on listed buildings, or where the extension exceeds permitted development limits in size or height. We can advise on what is likely to require consent, though formal planning queries should always be confirmed with your local authority.
Can you match the roofing material to the existing house roof?
We can specify materials that complement or intentionally contrast with the existing roof. For extensions on period properties, natural zinc or copper often suits the character of the building. For contemporary extensions, a clean standing seam finish in zinc, aluminium, or steel is a popular choice. We will advise on what works best for the specific property and planning context.
When in the build programme should the roofer be on site?
Typically once the structural frame or deck is complete and watertight temporary protection is in place. For extensions with complex interfaces — where the new roof meets an existing wall or roof covering — early engagement with us at design stage avoids detailing problems that are much harder to solve once the frame is built.
Materials
See all materials →Zinc
Zinc roofing and cladding: an 80–100 year lifespan, a natural patina finish, and the workability to handle complex detailing and bespoke roof forms.
Aluminium
Aluminium roofing and cladding: lightweight, corrosion-resistant, and available in a wide range of colours and profiles for modern homes and commercial projects.
Single Ply
Single ply roofing: a fast, lightweight flat roof system with 20–25 year warranties, suitable for extensions, apartment blocks, and commercial buildings.
Articles
See all articles →Metal Roofing for Residential Extensions: What to Consider
A practical guide to specifying metal roofing on residential extensions, covering material choice, flat vs pitched roofs, and planning.
Flat Roof Replacement: Single-Ply vs Metal
Deciding between single-ply membrane and metal for a flat roof replacement? This guide covers performance, cost, lifespan, and which system suits which project.
Standing Seam Metal Roofs: Are They a Smart Investment?
Standing seam metal roofing has no exposed fixings and needs almost no maintenance. Here's how it works and whether it's right for your project.
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Tell us about your project and we'll advise on materials, detailing, and give you a free written quote.