Greater London · England
Window Mastic in Hounslow West
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Hounslow West. Fully insured, ARBOMaster approved and guaranteed for a year.
- Black, perished sealant on frames
- Water coming in at the bottom corners of a door
- Leaking joints at the ends of sills
Window mastic in Hounslow West
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on composite doors, uPVC windows and aluminium frames, and common reasons people get in touch are untidy mastic left by window fitters and cold air getting in at the frame edge.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Hounslow West.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Hounslow West (TW4, TW3, TW5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Keep jet washers away from the mastic
- Do not paint over the silicone
- Make sure the drainage slots are not blocked
- Check the mastic once a year
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
Common problems we fix in Hounslow West
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
The most common problems we see are:
- Cold air getting in at the frame edge
- White mastic on grey or black frames
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
Hounslow West is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What your quote should include
- How long to leave it before use
- What the quote includes, VAT included or not
- What product goes in the joint
- How much experience the applicator has
What the job involves on each surface
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Work for landlords, hotels and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We work for landlords and letting agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
More services for Hounslow West
The process
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes a few hours for a handful of frames, longer for a whole house for a typical job. For a job in Hounslow West, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Let us know about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
For window mastic in Hounslow West, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
What sealant work can’t fix
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- A door that needs adjusting, rehanging or new seals
- Broken hinges, locks or handles
- Damp coming through the wall itself rather than the frame joint
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Timber windows & doors
- Aluminium frames
- Window sills
- uPVC windows
- Patio & French doors
- Composite doors
Hounslow West questions
Can you help a landlord with a rental near Hounslow station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Is parking a problem for a job in Hounslow West?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Are you fully insured?
Yes. We are fully insured.
How long does it take to reseal the windows on a house?
A few frames take a few hours, while a whole house takes longer. You will get a timescale with the quote.
Can I paint over the new sealant?
Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
Window mastic in Hounslow West: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Osterley House (about 2.1 miles north-east) are a reminder that the area around Hounslow West has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as Church of St Paul, the joint between an old wall and a newer frame is normally the first place rain gets in. If you let a flat or house near Hounslow station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Hounslow West is about 2 miles west of Hounslow, in Greater London. Hounslow West 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. Our London page covers work nearby, about 13 miles away.
Every address in TW4, TW3 and TW5 is covered for window mastic, from the main roads to the quietest streets. That includes homes and businesses on Ivy Lane, Toad Lane and Bath Road. Main roads around Hounslow West include the A3006 and A3063. Nearby, we also carry out window mastic in Heston (1 mile north), Lampton (1 mile east), North Hyde (2 miles north), Hounslow (2 miles east) and Woodlands (2 miles east). Within a short drive, we also cover London (13 miles east), City of Westminster (11 miles east), Marylebone (11 miles east), Kensington (8 miles east), St Pancras (12 miles east) and Shoreditch (14 miles east).
What’s near Hounslow West
Locally, jobs take us to homes and businesses close to Hounslow Heath, The Heathland School and Gunnersbury Catholic School. Hounslow West’s nearest station is Hounslow station, about 1.2 miles east of the centre. Well-known places in the area include Museum of Army Music (1.9 miles south-east) and Hounslow Hospital (0.7 miles east). Open spaces near Hounslow West include Richmond Hill and Garden Lake.