Rear & Side Extensions
Pitched or flat, tied into the existing roof or abutting the wall. The most common new roof we install across Bagshot.
New Roof Installations In Bagshot
New Roof Installations In Bagshot
A roof on something newly built is a different job to replacing an old one. It has to meet current regulations, and it has to marry into the existing roof as though it was always there.
A Different Job
New Build Roofing Versus Re-Roofing
Replacing a roof means putting back something that already worked. Installing a new one means creating something that has never existed — on a structure that is itself brand new, against a building that has moved and settled for the last eighty years.
That junction is where the skill sits. A new extension roof has to be tied into the original roof or wall so that the two behave as one building, with leadwork designed to absorb differential movement rather than resist it. Get that wrong and the leak appears at the join within a couple of winters, precisely where it is most awkward to fix.
There is also considerably more regulation involved than most homeowners expect. New roofs are required to meet current standards for insulation, ventilation and structural performance — not the standards that applied when the house was built. That affects the build-up depth, the ridge height and sometimes the design itself.
We work on new roofs across Bagshot alongside builders, architects and homeowners project-managing their own extensions. The earlier we are involved, the fewer compromises get baked in before we arrive.
What We Roof
New Structures We Install Roofs On
If it is newly built and needs covering, it is likely something we take on.
Loft Conversions
Working with your conversion specialist on new dormers, rooflights and the alterations to the main roof that the conversion requires.
Dormers
Cheeks, roof and the flashings that tie them into the main slope — the detail that decides whether a dormer stays dry.
Garages & Car Ports
New detached garages, car ports and workshops, in pitched tile or a modern flat system depending on the design.
Garden Rooms & Outbuildings
Home offices, studios and garden rooms, where insulation and ventilation matter as much as they do on the house.
New Build Housing
Complete roofs on new dwellings and plot developments, from first truss to final ridge.
Working Together
How A New Roof Installation Runs
New build work involves other trades, so sequencing and communication matter as much as the roofing itself.
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Drawings & Specification
We review the plans, agree the covering, build-up and ventilation strategy, and flag anything that will not work in practice before materials are ordered.
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Programming With The Build
A roof cannot go on before the structure is ready, and every trade after us waits on the building being watertight. We book realistically and hold the date.
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Structure & Weatherproofing
Membrane, battens and covering go on to make the building watertight as quickly as possible, so the internal trades can get moving.
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Tying In & Finishing
Leadwork to abutments, flashings into the existing roof, and the roofline finished so the new work reads as part of the original house.
Planning An Extension Or Conversion?
Talk to us before the drawings are finalised. Roofing input at that stage costs nothing and regularly saves money later.
What's Involved
What A New Roof Installation Covers
Everything from the membrane up, plus the junctions that connect the new work to the old.
- Breathable membrane, treated battens and the chosen covering
- Pitched tile, natural slate or a modern flat roof system
- All leadwork tying new work into existing roofs and walls
- Valley formation where a new pitch meets the original roof
- Dormer roofs, cheeks and their flashings
- Rooflight and lantern kerbs built and detailed in
- Fascias, soffits, guttering and downpipes on the new elevation
- Ventilation designed in at eaves and ridge to meet current standards
Why Us
A New Roof That Looks Original
The mark of a good extension roof is that a visitor cannot tell where the old house stops.
- Coverings matched sympathetically to the existing roof
- Junctions formed in dressed lead, designed for movement
- Ventilation and insulation specified to current standards
- Realistic programming, so following trades are not left waiting
- Direct communication with your builder or architect throughout
Common Questions
New Roof Installation Questions
What homeowners and builders ask us before a new roof goes on.
Cannot see your question? We are always happy to talk it through — there is no such thing as a silly question when it comes to your roof.
Can you work alongside my builder?
Regularly, and it is how a lot of our new build work comes about. We liaise directly with the builder or main contractor on sequencing and detailing so nobody is waiting on anybody, and you are not left relaying technical questions between two trades.
Will the new roof match my existing one?
That is always the aim, and on visible elevations it matters a great deal. Where the original tile is still manufactured we use it; where it is not, we source the closest match in profile and colour. Bear in mind a new covering will look brighter until it has weathered a season or two.
Do I need building regulations approval?
For a new extension, dormer or loft conversion, yes — the roof forms part of that application and must meet current thermal, ventilation and structural standards. We build to those requirements and provide whatever detail your building control officer needs.
How soon can the building be made watertight?
That is usually the priority for everyone on site, since the internal trades cannot start until it is. Once the structure is ready for us, membrane and battens can go on quickly, and we will always prioritise getting the building closed in over finishing cosmetic detail.
Can you roof a garden room or home office?
Yes, and they are worth doing properly. A garden room roof with poor insulation or no ventilation becomes an unusable room — freezing in January, unbearable in July, and prone to condensation. The roof build-up matters more on a small building, not less.
Do you handle the guttering on new work too?
We do. Fascias, soffits, guttering and downpipes on the new elevation are all part of what we install, matched to the existing roofline and discharged so the water actually goes somewhere sensible.
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