Roof Extensions and New Builds Preston
What we roof
| Project | Typical roof | What matters most |
|---|---|---|
| Single-storey extension | Pitched, lean-to or flat | The junction with the house wall |
| Two-storey extension | Pitched, tied into the main roof | Matching the existing slates or tiles |
| Kitchen or garden room | Flat or lean-to | Falls, outlets and flashing |
| Dormer | Flat or pitched dormer roof | Cheeks, flashings and covering |
| Garage or outbuilding | Pitched or flat | Choosing the right covering for the use |
| New build house | Pitched, in slate or tile | Membrane, battens, ventilation and details |
Pitched roofs
On a pitched extension roof or a new build, we fit breathable membrane, battens and the roof covering, then finish the ridges, hips, verges and valleys properly. We fit slate roofs and tiled roofs. Most of what decides how long a pitched roof lasts is hidden once the covering is on, so we take as much care with the layers underneath as with the finish.
Flat roofs
Flat roofs suit many single-storey extensions, kitchen extensions and dormers. We fit felt, EPDM rubber and GRP fibreglass, laid to proper falls so water drains away rather than ponding. Our new flat roofs come with 20+ year guarantees. See our flat roofing page.
Where the new roof meets the old
The join between an extension roof and the existing house is where leaks most often start. A lean-to roof has to be sealed where it meets the house wall. A two-storey extension often ties into the main roof, with a new valley or abutment. Both need lead flashing dressed and fixed correctly. We take as much care over this junction as over the rest of the roof, because it's the part that's hardest to put right later.
Matching the existing house
On an extension, the new roof should look like it belongs. We match the slates or tiles to the house as closely as we can. On older houses, an exact match isn't always possible, because the original materials may no longer be made or have weathered over the years. When that's the case, we'll show you the closest options before we order anything.
Choosing between flat and pitched
The choice is usually set by the design and the planning approval, but it helps to know the trade-offs:
- Pitched roofs shed water quickly and can match the main house, but need more height and cost more to build.
- Flat roofs suit low extensions and keep the roofline simple, but need proper falls and good detailing to stay watertight.
- Lean-to roofs sit against the house wall and need a well-made junction with it.
Your designer or builder will usually decide, and we're happy to talk through the options.
Planning and building regulations
Many extensions need building regulations approval, and some need planning permission. That's usually arranged by you, your architect or your builder before work starts. We'll build the roof to the approved drawings, and talk to your builder or designer if anything on site needs agreeing. If the extension is on or near your boundary, the government says you must tell your neighbours about building work near or on your shared property boundary.
Working with your builder
If a builder is putting up the walls, we fit the roof when the structure is ready. Tell us who's doing what and when, and we'll fit in with the build. Once the roof is on, the building is weathertight and the inside work can carry on.
What helps us quote
To quote accurately for an extension or new build roof, it helps to have:
- The approved drawings, showing the roof shape, pitch and covering.
- The planned timing, so we know when the structure will be ready.
- Who's doing what, if a builder or other trades are involved.
- Any conditions from the planning approval about materials.
If you don't have all of this yet, we can still look at the job and talk it through.
How we work
- Look at the drawings and the site, and agree what's included.
- Quote before any work, with the materials set out.
- Agree timing with you or your builder.
- Fit the roof from membrane and battens to the covering and details.
- Seal the junctions with the existing house.
- Clear up and show you what's been done.
Our warranty
Our premium roofing projects come with a 30-year warranty on materials and workmanship. Ask us for the details when we quote.
Frequently asked questions
Can you match the roof on my extension to my house?
We match the slates or tiles as closely as we can. On older houses, an exact match isn't always possible, and we'll show you the options.
Flat or pitched roof for my extension?
It depends on the design, the planning approval and the budget. Your designer will usually set this, and we can talk through the options.
Do you work with builders and self-builders?
Yes. We fit roofs for homeowners, self-builders and builders.
Do you fit roofs on new build houses?
Yes. We fit new roofs in slate or tile. See our new roof installations page.
Do you roof dormers?
Yes. We fit flat and pitched dormer roofs, with the flashings and cheeks finished properly.
Are your quotes free?
Yes. Call 07742 720 236 for a free quote.
Planning an extension or new build in Preston?
Call Danny on 07742 720 236 or request a free quote. For all our building-project roofing, see our construction company page.