Greater London · England
Window & door mastic in St Giles, Greater London
Mastic around window and door frames, sills and patio doors in St Giles, with a one-year guarantee on every job. Ask us for a quote.
- Rushed sealant from a window installation
- Sealant in the wrong colour for the frame
- Cold air getting in at the frame edge
What the job involves on each surface
Composite doors
Composite doors are normally hung in an uPVC-type frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. The threshold and the bottom corners take the most water, so they get particular care.
Window mastic in St Giles
Homes in St Giles have every kind of window: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We’re often asked to deal with mastic that’s falling out in pieces and whistling draughts around closed windows, across uPVC windows, window sills and composite doors.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Where
- St Giles (W1F, W1D, W1T)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Nearby places to St Giles
Also in St Giles
What window mastic looks like in St Giles
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
As a London address, St Giles can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Letting a property close to Tottenham Court Road station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
St Giles is about 1 mile east of City of Westminster, in Greater London. St Giles gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 764 places across Greater London.
Here we cover the W1F, W1D and W1T postcode area for window mastic. Whether your property is on Duck Lane, Drury Lane and Bridle Lane or a nearby road, our applicators can take on the job. You’ll find St Giles on the A301 and A400, which makes it straightforward to reach. If you’re just outside St Giles, we cover Seven Dials (1 mile south), West End (1 mile south-west), Soho (1 mile south-west), Covent Garden (1 mile south-east) and Chinatown (1 mile south-west). We also work in nearby towns such as Kensington (3 miles west), Walthamstow (7 miles north-east), Hampstead (4 miles north-west), Ruislip (13 miles west), Stockwell (3 miles south) and Orpington (13 miles south-east).
Local landmarks in St Giles
In St Giles, that means homes and buildings near LSE Shaw Library, The Crown pub and Mercers' School. Also close by are London Nautical School (1 mile south-east) and St Anne's Churchyard (within half a mile south-west). St Giles has its own railway station: Tottenham Court Road station. Nearby you’ll also find Montfichet's Tower (1.1 miles east) and Kingly Court (0.5 miles west). For a walk, there’s Barnsbury Wood and Ludgate Hill.
Looking after it afterwards
So the new joints stay in good condition:
- Paint up to the joint, not over it
- Wash the frames with mild soapy water
- Keep paint and stain on wooden frames in good order
- Ventilate rooms so frames don’t stay wet inside
Silicone can’t usually be painted, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. A new joint closes it up.
Why it’s worth doing now in St Giles
Getting a straight, even bead on an outside frame takes practice, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in St Giles, the repair is bigger than a sealant job.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- Experience in homes, commercial sites and hotels
- Sanitary silicone with an anti-fungal additive in wet areas
- We leave the area clean and tidy
- One-year guarantee on every job
See what affects the cost and our reviews.
Common questions in St Giles
Do you cover St Giles for window mastic?
Yes. We work across London and the South East, and St Giles is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Is parking a problem for a job in St Giles?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
How many windows can you do in a day?
A handful of frames is a short visit, while a whole house takes longer. We confirm the timing with your quote.
Do you guarantee window mastic?
Yes. All our work carries a 12-month guarantee, and we are fully insured.
What do you need from me for a quote?
A short description and the location, with pictures by email if possible. If we need more, we’ll ask.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Can you seal the gap between the frame and the plaster indoors?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
How the visit works
We keep the work tidy and contained to the area we are working on, so you can carry on as normal. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are, and we explain the cure time before we leave. In a London area like St Giles, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
- Try not to wet indoor joints just before the visit
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work before giving you a price.
Related advice
How we quote for window mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Access and height
- Any working-time requirements on site
- How many areas need sealing
- The product the joint needs
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
When you call or email, it’s useful to know:
- Photos by email, if that is easy
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- How many joints, rooms or windows are involved
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Signs you need window mastic in St Giles
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. Backing rod sets the right depth.
The problems people generally mention when they call include:
- Gaps left after new windows were fitted
- Gaps between the frame and the inside reveal
- Mastic that’s falling out in pieces
- Cracked sealant at the sill ends
For an older house near a landmark such as Soho Baptist Chapel, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before you book
- Which sealant they’ll use, and why
- What happens if the job turns out different
- Whether they’re fully insured
- What preparation is included
When something else is needed
A few problems are outside what sealant work can do:
- A failed sealed unit that has misted up
- A frame that has rotted at the joint
- Faulty window hardware
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in St Giles
- Timber windows & doors
- Patio & French doors
- Window sills
- Composite doors
- uPVC windows
- Aluminium frames