Greater London · England
Hammersmith Window Mastic
Mastic around window and door frames, sills and patio doors for Hammersmith, backed by a 12-month guarantee. Call for a quick quote.
- Whistling draughts around closed windows
- A bead that does not match the frame
- Old mastic that has gone black or come away
Quotes for window mastic in Hammersmith
We do not publish a price list, because no two jobs are the same. What we look at:
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- Any working-time requirements on site
- The number of rooms or windows
What you pay reflects the work, not guesswork. That’s why we ask about the job first and give you a clear price before work begins.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it has been sealed before
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
Need a quote? Please phone 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Window mastic in Hammersmith, done properly
Homes in Hammersmith have every kind of window: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. If you have gaps left after new windows were fitted and white mastic on grey or black frames, we can help, whatever the surface.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Hammersmith.
All our work is covered by our 12-month guarantee, wherever you are in Greater London.
- Place
- Hammersmith (W6, W14, W12, W4)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
FAQs for Hammersmith
Can you do window mastic in Hammersmith?
Yes, Hammersmith is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Do you work for landlords with property near Kensington Olympia station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we’ll tell you.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
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 sealing both is often worthwhile.
How do I get a quote for window mastic in Hammersmith?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or send us an email and let us know what needs doing and where.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Frames and glazing around Hammersmith
Historic houses like Kelmscott House (about 0.5 miles south-west) are a reminder that the area around Hammersmith has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Hammersmith is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For an older house near a landmark such as Church of the Holy Innocents, the joint between an old wall and a newer frame is generally the first place rain gets in.
Hammersmith is about 1 mile west of Kensington, in Greater London. For window mastic in and around Hammersmith, please call 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base, Hammersmith included. We cover 764 towns and villages across Greater London, from the larger towns to small villages. For nearby work, see our London page, about 6 miles away.
Work in W6, W14, W12 and W4 is quoted and booked the same way as anywhere else. We cover properties on The Square, Ravenscourt Square and Westcroft Square. Neighbouring places we cover for window mastic include Brackenbury Village (1 mile north-west), Brook Green (1 mile east), North End (1 mile east), West Kensington (1 mile east) and Old Chiswick (1 mile south-west). Within a short drive, we also cover London (6 miles east), City of Westminster (4 miles east), Marylebone (4 miles north-east), St Pancras (5 miles north-east), Shoreditch (7 miles east) and Walthamstow (11 miles north-east).
What’s near Hammersmith
In Hammersmith, that means homes and buildings near The Duke of Hammersmith pub, Brook Green and Polish Library POSK in London and the streets around them. The nearest railway station is Kensington Olympia station, roughly 0.8 miles east of the centre. Well-known places in the area include West London Hospital (less than half a mile south-east) and Kurdish Museum Library and Archive (under half a mile south-west). Green spaces nearby include Campden Hill and WWT London Wetland Centre.
How the visit works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a handful of frames, longer for a whole house, and the area is left clean. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Hammersmith. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we go round the frames with you and agree the list.
- 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.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Mention any parking rules near the property
- Move anything stored near the joints
- On commercial sites, let us know about site rules
How to get a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Advice
Do you need window mastic in Hammersmith?
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
The most common problems we see are:
- Old mastic that has gone black or come away
- Cracked sealant at the sill ends
- Whistling draughts around closed windows
- Hard, cracked sealant around windows
If you look after a building such as Corona Theatre School, the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- How the surfaces are prepared before sealing
- What the quote includes, VAT included or not
- When the joint can take water or movement
- How much experience the applicator has
Why deal with it now?
Resealing frames is a short job: the visit takes a morning for a couple of windows and a door. Leave it until water is coming in and you may need plastering and decorating as well. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in Hammersmith.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
Why choose Mr Mastic in Hammersmith
- White, clear, grey or another colour, product permitting
- 20+ years of sealant experience
- Colour agreed with you before we start
- ARBOMaster approved applicator
For landlords and businesses
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we are fully insured for the work.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
How to look after the new joints
After the cure time, these simple habits help:
- Repaint timber before it’s bare
- Ventilate rooms so frames don’t stay wet inside
- Check the mastic once a year
- Clean frames with a soft cloth and soapy water
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 the old mastic shrinks further, more air gets through, and a cold room gets colder. A new joint closes it up.
How the job changes by surface
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
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.