Greater London · England
Window & door mastic in Southall, Greater London
Professional window mastic in and around Southall, with old sealant always removed completely.
- Cracked sealant at the sill ends
- Old mastic that has gone black or come away
- Whistling draughts around closed windows
Why deal with it now?
Draughts and leaks do not always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email for an honest opinion and a quote.
Why book with us
- Approved under the ARBOMaster scheme
- Colour picked to suit the job
- 4.9 on Google from 180+ five-star reviews
- More than 20 years in sealant work
See how sealant jobs are priced and our reviews.
Window mastic for homes and businesses in Southall
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. We work on patio & French doors, uPVC windows and aluminium frames, and common reasons people get in touch are gaps left after new windows were fitted and whistling draughts around closed windows.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Southall is something to talk through when you book.
You get a one-year guarantee, the same in Southall as everywhere else we work.
- Location
- Southall (UB2, UB1, UB6, W7)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Southall
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
Look out for these signs:
- Hard, cracked sealant around windows
- Gaps where the sill meets the wall
- Mastic that is falling out in pieces
- Cold air getting in at the frame edge
If you look after a building such as Hambrough Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- Is VAT in the price?
- Who does the work, and how experienced they are
- What insurance they hold
- How the surfaces are prepared before sealing
When it isn’t the sealant
We’d rather tell you now than do work that won’t last, so these are the limits:
- Worn gaskets, brush seals or a door that has dropped
- A sash or casement that will not close properly
- Condensation trapped between the panes
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Where we work in Southall
- Patio & French doors
- uPVC windows
- Aluminium frames
- Composite doors
- Window sills
- Timber windows & doors
Towns and villages near Southall
More services for Southall
Frames and glazing around Southall
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. Historic houses like Osterley House (about 1.7 miles south-east) are a reminder that the area around Southall has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Homes close to Saint John include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. As a London address, Southall can be tricky for parking: let us know about parking bays, permits or a driveway.
Southall is about 3 miles west of Ealing, in Greater London. For window mastic in and around Southall, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base. Across Greater London, we cover 764 places, Southall among them. We also work in London, around 12 miles away.
We cover every part of the UB2, UB1, UB6 and W7 postcode area for window mastic and the streets around it. If you need window mastic at a property on Uxbridge Road High Street, Emerald Square and Randolph Road or anywhere close by, our applicators can take on the job. We also cover the places around Southall: Dormers Wells (1 mile north-east), West Ealing (2 miles east), Yeading (2 miles north), Yiewsley (2 miles north) and Hanwell (2 miles east). Within a short drive, we also cover London (12 miles east), City of Westminster (10 miles east), Marylebone (10 miles east), Kensington (8 miles east), St Pancras (11 miles east) and Shoreditch (13 miles east).
Around Southall
Locally, jobs take us to homes and businesses close to Minet Country Park, Glassy Junction pub and Villiers High School. There’s a railway station in Southall itself: Southall station. A little further out are Treaty Centre (2.8 miles south) and Museum of Army Music (3.8 miles south). Open spaces near Southall include Northala Fields and Middle Lake.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Wash the frames with mild soapy water
- Keep drainage slots and sill grooves clear
- Do not paint over the silicone
- Avoid blasting the frames with a pressure washer
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
If you manage several properties in or around Southall, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
What we do, step by step
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from an hour or two to a full day, depending on how many frames there are. In Southall, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- 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
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any previous sealing or DIY attempts
- Move anything stored near the joints
How to get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work.
Read more
Your questions about window mastic in Southall
Can you help a landlord with a rental near Southall station?
Yes. We work for landlords and agents as well as homeowners, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Can parking be tricky for a visit in Southall?
Parking in Southall, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
What information do you need?
A short description and the location, with photos by email if possible. We will ask anything else we need to know.
Can I paint over the new sealant?
It depends on the sealant. Silicone is not paintable, but some hybrid sealants are. Tell us if you’re decorating and we’ll choose accordingly.
Can you seal the gap between the frame and the plaster indoors?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Will resealing my frames help with draughts?
In many cases. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Surface by surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. We prepare and reseal every joint, backing the deep ones.
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so we pay close attention there.