Greater London · England
Window & door mastic in Mortlake, Greater London
Mastic around window and door frames, sills and patio doors in Mortlake, with a one-year guarantee on every job. Ask us for a quote.
- Rain getting in at the frame or under the sill
- Old mastic that has gone black or come away
- White mastic on grey or black frames
Window mastic for homes and businesses in Mortlake
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that cannot flex, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. We work on composite doors, window sills and timber windows & doors, and the jobs we see most are black, perished sealant on frames and cold air getting in at the frame edge.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
All our work is covered by a 12-month guarantee, wherever you are in Greater London.
- Place
- Mortlake (SW14, SW13, SW15)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- Any working-time requirements on site
- Any mould that needs treating
- The product the joint needs
- Access and height
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and give you a clear quote before any work starts.
What we need to know
To help us quote quickly, let us know:
- Whether it’s a home or a business
- The rough size of the job
- The address or postcode of the job
- The problem you’ve noticed
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
How to look after the new joints
To keep the joints looking good and working properly:
- Look round the frames every year or so
- Wash the frames with mild soapy water
- Don’t use solvent cleaners on the joint
- Keep timber frames painted
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
FAQs for Mortlake
Is parking a problem for a job in Mortlake?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Can you do window mastic in Mortlake?
Yes, Mortlake is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Do you work for letting agents?
Yes, we do. We work in homes, commercial premises and hotels.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or send us an email.
How long will my window job take?
Allow a few hours for a few frames, or a day or more for a whole house. Access and the amount of old mastic make the biggest difference.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Also near Mortlake
More services for Mortlake
How it works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours for a few frames, or a day or more for a whole house. For a job in Mortlake, 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.
- We check how each frame can be reached safely.
- 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.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we are working on
How to get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we will take it from there.
Read more
Different surfaces, different methods
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour keeps the clean look.
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain cannot run into the wall.
Windows and doors in Mortlake
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Historic houses like Chiswick House (about 1.3 miles north) are a reminder that the area around Mortlake has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Mortlake is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Homes close to All Saints' Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Mortlake is about 3 miles west of Fulham, in Greater London. For window mastic in and around Mortlake, it’s easy to get a quote: please phone 0345 464 0079 or email us. We cover Greater London from our Crawley base, Mortlake included. Mortlake is one of 764 places in Greater London where we work. You can also see our page for London, roughly 8 miles from Mortlake.
Postcode districts we cover here for window mastic: SW14, SW13 and SW15. Streets in the area include Elm Road, Well Lane and Coval Road, and we cover them all. Being close to the A3003, Mortlake is easy for our applicators to reach for window mastic. Other places close to Mortlake include East Sheen (1 mile south-west), North Sheen (1 mile north-west), Barnes (1 mile north-east), Grove Park (1 mile north) and Roehampton (1 mile south-east). Within a short drive, we also cover London (8 miles east), City of Westminster (6 miles north-east), Marylebone (6 miles north-east), Kensington (4 miles north-east), St Pancras (8 miles north-east) and Shoreditch (9 miles north-east).
Landmarks near Mortlake
In Mortlake, that means homes and buildings near Richmond Park Academy, Hare and Hounds pub and Palewell Park, among other places. Mortlake has its own railway station: Mortlake station. A little further out are Ubuntu Museum: African Museum of Humanity (1.1 miles south-east) and Barnes Hospital (within half a mile east). For a walk, there’s Richmond Hill and Kew Gardens Lake.
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Common problems we fix in Mortlake
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.
Keep an eye out for any of the following:
- Gaps between the frame and the inside reveal
- Sealant in the wrong colour for the frame
- Leaking joints at the ends of sills
- Gaps left after new windows were fitted
For landlords with property near Mortlake station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What to look for in a quote
- Is the old sealant removed completely?
- What product goes in the joint
- How long to leave it before use
- Whether VAT is included
Landlords, agents and businesses in Mortlake
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.