Greater London · England
Window Mastic in Strand-on-the-Green
Mastic around window and door frames, sills and patio doors for homes and businesses in Strand-on-the-Green and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Mastic that has split away from the wall
- Untidy mastic left by window fitters
- Cold air getting in at the frame edge
When it isn’t the sealant
A few problems are outside what sealant work can do:
- Condensation trapped between the panes
- Rotten timber, which needs a joiner first
- A sash or casement that won’t close properly
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before you book.
What we seal
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- uPVC windows
- Window sills
- Composite doors
Window mastic for homes and businesses in Strand-on-the-Green
The new joint doesn’t have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. Common call-outs are for gaps between the frame and the inside reveal and mastic that has split away from the wall, across uPVC windows, composite doors and aluminium frames.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or send us an email.
- Place
- Strand-on-the-Green (W4, TW9, TW8)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
We keep the work tidy and contained to the joints we are treating, 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 tell you how long to leave it before we go. In Strand-on-the-Green, 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.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- 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 about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
- Mention any leaks or damp you’ve noticed
How to get a quote
We quote each job on its own. Simply phone 0345 464 0079 or email us and describe the job.
Read more
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What window mastic looks like in Strand-on-the-Green
With historic houses such as Kew Palace (about 0.7 miles west) nearby, there’s older building stock in the area around Strand-on-the-Green as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you let a flat or house near Chiswick station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. In the older streets around St Paul's Church, the joint between an old wall and a newer frame is usually the first place rain gets in. Strand-on-the-Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Strand-on-the-Green is about 2 miles south of Acton, in Greater London. If you need window mastic in Strand-on-the-Green, please ring 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Greater London. We cover 764 towns and villages across Greater London. There’s also a page for London, roughly 8 miles from Strand-on-the-Green.
Every address in W4, TW9 and TW8 is within our area for window mastic, from the main roads to the quietest streets. Window mastic is available to properties on Kew Road, Maze Road and Kent Road and the roads around them. Main roads around Strand-on-the-Green include the A3000, so getting to you is simple. Neighbouring places we cover for window mastic include Kew (1 mile south), Grove Park (1 mile east), Gunnersbury (1 mile north), North Sheen (1 mile south) and Turnham Green (1 mile east). Larger places within reach include London (8 miles east), City of Westminster (6 miles east), Marylebone (6 miles east), Kensington (3 miles east), St Pancras (7 miles north-east) and Shoreditch (9 miles east).
Local landmarks in Strand-on-the-Green
Around Strand-on-the-Green, our work takes us to homes and buildings near Chiswick School, Kew Green and Bull's Head pub, among other places. You will also find Library for Iranian Studies (1.6 miles north) and Kew College Prep (within half a mile south-west). The nearest railway station is Chiswick station, about 0.5 miles south-east of the centre. A little further out are Livat Hammersmith (2.2 miles east) and Barnes Hospital (1.5 miles south-east). Green spaces nearby include Richmond Hill and Kew Gardens Lake.
How we quote for window mastic
Call for a quick quote. The main things that affect it are:
- The number and length of the joints
- Any working-time requirements on site
- The type of sealant required
- Any mould that needs treating
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Asking for a quote
When you contact us, it’s useful to know:
- How we’d reach the joints
- Where the job is, and your postcode
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or drop us an email.
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Clean frames with a soft cloth and soapy water
- Repaint timber before it’s bare
- Walk round the house once a year and look at the joints
- Keep jet washers away from the mastic
Silicone cannot normally be painted, so mention any painting plans before work begins. We can use a paintable sealant where that matters.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
Nearby places to Strand-on-the-Green
What else we do in Strand-on-the-Green
Your questions about window mastic in Strand-on-the-Green
Is parking an issue for window mastic in Strand-on-the-Green?
Parking in Strand-on-the-Green, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you do window mastic in Strand-on-the-Green?
Yes, Strand-on-the-Green is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages.
How many windows can you do in a day?
That depends on the number of frames, how they’re reached and the state of the old mastic. We will tell you how long your job needs when we quote.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Strand-on-the-Green, along with the rest of our area.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that generally means someone at home.
For landlords and businesses
Letting agents and landlords in Strand-on-the-Green can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Different surfaces, different methods
uPVC windows
We clean the frame edge carefully so the plastic isn’t marked, then the new bead is laid against the frame and the wall and tooled smooth.
Composite doors
A composite door normally sits in a plastic outer frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.