- Postcode district
- GU9
- Survey
- Free for new and replacement doors
- Typical lead time
- Typically 4–6 weeks for the door after the opening is measured; building work scheduled around approvals
- Guide price
- From £6,595 inc VAT
- Nearby
- Aldershot, Fleet, Farnborough
- Building rules
- England
Is a sliding door for a new opening a good fit for your home in Farnham?
Most homeowners choosing sliding doors for new openings want the same things: more light, a clear view and a door that is easy to live with.
For homes in Farnham that are listed or covered by an Article 4 direction, ask the council about the new opening before paying for structural calculations.
Where a Farnham house has a bay, chimney breast or upstairs window directly above the planned opening, the engineer will need to account for it in the steel design.
- Temporary propping holds up the wall above while the masonry is cut out, keeping floors, ceilings and the roof safely supported throughout the work.
- Telling the engineer that a sliding door will sit beneath the beam lets them limit its deflection, which matters because a beam that sags can stop panels sliding freely.
- Making good the reveals and head after the steel goes in leaves a square, plumb opening, which is what a precision-made sliding door needs to run smoothly.
Daylight in Farnham and what it means for your glass
Daylight in Farnham runs from about 7 h 52 min in December to 16 h 35 min in June, with the noon sun at roughly 15° and 62° respectively. Use that to choose your glass: standard low-E double glazing for north and east elevations, and consider solar-control or triple glazing for sunny south and west walls.
Guide prices for sliding doors for new openings in Farnham
Guide prices cover the door and forming the opening — steel beam, padstones, making good and structural calculations — fitted, including VAT. Building Control fees are set by your council and are extra.
| Overall width | Typical panels | Guide price (fitted, inc VAT) |
|---|---|---|
| 1.5 m | 2 panels | £6,595–£7,295 |
| 1.8 m | 2 panels | £6,995–£7,795 |
| 2.4 m | 2 panels | £7,895–£8,895 |
See every size on the sliding doors for new openings page or try the guide price tool.
What happens when you order sliding doors for new openings in Farnham?
Nothing is ordered until you sign off the surveyed specification. The door is made from the finished opening sizes (typically 4–6 weeks for the door after the opening is measured; building work scheduled around approvals), and fitting usually takes 3–5 days of building work, then 1–2 days to fit the door. If you are in Aldershot or Fleet, the same process and prices apply.
Rules for sliding doors for new openings in England
A new or wider opening in England needs Building Control approval for the structural work as well as compliance for the door itself under Approved Documents L and K. Expect structural calculations, a steel beam and, where a party wall is involved, notices under the Party Wall etc. Act 1996.
Choosing the specification
- Widening an existing door. Removing masonry each side of an old patio door to take a wider slider.
- Steel beam with padstones. A beam sized by the engineer to carry the wall, floors and roof above.
- Window to door conversion. Cutting down below an existing window to form a door opening to the garden.
Questions about sliding doors for new openings in Farnham
How soon can you survey in Farnham?
Surveys in the GU9 district are booked at a time that suits you, and we offer survey dates when we reply to your enquiry. After you approve the written quote, manufacture is typically 4–6 weeks for the door after the opening is measured; building work scheduled around approvals.
Why does beam deflection matter for sliding doors?
Beam deflection matters because a sliding door needs a straight, level head to run properly. Every beam bends slightly under load, and if it bends too much the frame can be squeezed, making panels stiff or causing them to bind. Telling the structural engineer that a large sliding door will go underneath allows them to design a stiffer beam.
Do I need building regulations to widen a door opening?
Yes, forming or widening an opening is structural work and needs a Building Regulations application in England, supported by structural calculations. Building Control inspects the work, typically including the steel and its bearings. In Scotland a building warrant is needed. Wales and Northern Ireland follow their own building regulations through local authority or district council building control.
How long does it take to form a new opening?
Forming or widening an opening typically involves 3–5 days of building work, including propping, cutting out, installing the steel and padstones, and making good. The sliding door is then made to the finished opening, which typically takes 4–6 weeks for aluminium, so a secure temporary closure is fitted in between. The door itself typically goes in within one to two days.