Greater London · England
Norwood Green Window Mastic
Window mastic in Norwood Green from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Hard, cracked sealant around windows
- Mastic that is falling out in pieces
- Cold air getting in at the frame edge
How we handle window mastic in Norwood Green
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We are often asked to deal with white mastic on grey or black frames and leaking joints at the ends of sills, on window sills, patio & French doors and uPVC windows.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Location
- Norwood Green (UB2, TW5, TW7)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for window mastic in Norwood Green
The quote reflects the job in front of us. We take into account:
- Whether the work is at height
- Working hours on commercial sites
- The amount of work
- How much old sealant there is and how hard it is to remove
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
- If someone has resealed it before
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job, and we will take it from there.
Window mastic in Norwood Green: local notes
With historic houses such as Osterley House (about 0.6 miles south-east) nearby, there’s older building stock in the area around Norwood Green as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
In the older streets around Church of St Mary, the joint between an old wall and a newer frame is usually the first place rain gets in. Letting a property close to Southall station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Norwood Green is about 1 mile south-east of Southall, in Greater London. Anywhere in UB2, we cover window mastic for homes and businesses. Norwood Green is one of 764 towns and villages in Greater London where we work for window mastic. You can also see our page for London, about 12 miles away.
We cover every part of UB2, TW5 and TW7 for window mastic and the streets around it. If you need window mastic at a property on Norwood Road, Stour Avenue and Durham Avenue or anywhere close by, our applicators can take on the job. Norwood Green sits on or near the M4 and A3005. Neighbouring places we cover for window mastic include North Hyde (1 mile west), Heston (1 mile south-west), Osterley (1 mile south-east), Spring Grove (1 mile south-east) and Lampton (1 mile south). We also work in nearby towns such as London (12 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (7 miles east), St Pancras (11 miles east) and Shoreditch (13 miles east).
Around Norwood Green
Typical jobs here are in homes near Inwood Park, The Plough Public House and Heston Community School and the streets around them. The nearest railway station is Southall station, about 1 mile north-west. A little further out are St Bernard's Hospital (1 mile north-east) and Museum of Army Music (2.7 miles south). Green spaces nearby include Garden Lake and Castlebar Hill.
Why it’s worth doing now in Norwood Green
Resealing frames is a short job: the visit takes anything from an hour or two to a full day, depending on how many frames there are. Leave it until water is coming in and you may need plastering and decorating as well. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Norwood Green, the repair is bigger than a sealant job.
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
Why book with us
- White, clear, grey or coloured to suit, where the product allows
- Any old sealant cut out fully, not covered over
- Neat joints and a tidy finish
- Sealant colour chosen to suit
Read what affects the cost and what customers say.
Common problems we fix in Norwood Green
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, so it comes away long before its time.
Common reasons people contact us are:
- Damp patches on the reveal after heavy rain
- Sealant in the wrong colour for the frame
- Gaps where the sill meets the wall
- Whistling draughts around closed windows
As a London address, Norwood Green can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- Whether they seal over old material or remove it
- Who does the work, and how experienced they are
- Is VAT in the price?
- Whether you can choose the colour
Also near Norwood Green
More services for Norwood Green
Norwood Green questions
Do you cover Norwood Green for window mastic?
Yes, Norwood Green is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
I let a flat near Southall station. Can you help?
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 drop us an email with the address and what needs doing, and we will give you a clear quote.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or drop us an email.
What does window mastic cost?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Where is Mr Mastic based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Can you reach windows above the ground floor?
Yes, in most cases. Access is planned before any work starts, so mention the height and anything in the way.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used before we leave.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Keep solvents and bleach off the sealant
- Avoid blasting the frames with a pressure washer
- Keep timber frames painted
- Ventilate rooms so frames do not stay wet inside
Try not to touch the new joint while it cures, following the cure time we give you. Do not point a pressure washer at the joints.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
What happens on the day
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. Expect the work to take most of a day for a typical house, less for a few frames, and we tell you how long to leave it before we go. In a London area like Norwood Green, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- 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.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
Ask for a quote
To get a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Related advice
When something else is needed
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- A door that needs adjusting, rehanging or new seals
- Condensation trapped between the panes
- Soft or decayed wood in the frame
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before booking.
Surfaces we seal
- Patio & French doors
- Timber windows & doors
- Composite doors
- uPVC windows
- Window sills
- Aluminium frames
Should I try it myself first?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.