Greater London · England
Putney Window Mastic
Window and door frames in Putney need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- A bead that does not match the frame
- Old mastic that has gone black or come away
- Gaps where the sill meets the wall
Window mastic for homes and businesses in Putney
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. Typical jobs include sealant in the wrong colour for the frame and rain getting in at the frame or under the sill, across uPVC windows, timber windows & doors and patio & French doors.
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, which is when draughts and damp patches appear in homes in Putney.
There’s a 12-month guarantee on every job.
- Where
- Putney (SW15, SW19, SW13)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Putney
I let a flat near Putney station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is Putney in your area for window mastic?
Yes. We work across London and the South East, and Putney is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Will new mastic stop draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Is the work guaranteed?
Yes. Our 12-month guarantee covers every job.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Can you match the sealant to my frames?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
What does window mastic cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or drop us an email with a short description of the job.
Surface by surface
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so they get particular care.
Do you need window mastic in Putney?
Mastic ages in the weather. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
Look out for these signs:
- Old mastic that has gone black or come away
- Leaking joints at the ends of sills
- Draughty joints inside around the window
- Rushed sealant from a window installation
If you live in an older home near Polish Church of St John the Evangelist, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before booking anyone
- What the quote includes, VAT included or not
- How the colour is chosen
- What preparation is included
- What the cure time is
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Clear any debris from frame drain holes
- Keep solvents and bleach off the sealant
- Don’t aim a pressure washer at the joints
- Wipe condensation off the frames
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
The process
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes anything from an hour or two to a full day, depending on how many frames there are, depending on how much there is to do. For a job in Putney, 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 start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Finally we tidy up and check each joint.
How to prepare
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- On commercial sites, let us know about site rules
Getting a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Read more
What window mastic looks like in Putney
With historic houses such as Fulham Palace (about 0.6 miles north-east) nearby, there’s older building stock in the area around Putney as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Putney is in London, so parking needs planning: let us know about parking bays, permits or a driveway. If you look after a building such as Our Lady of Victories Catholic Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Putney is about 1 mile south-west of Fulham, in Greater London. Whether you are in the middle of Putney or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, Putney among them. For nearby work, see our London page, about 6 miles away.
Work in SW15, SW19 and SW13 works the same way as everywhere else we cover. If you need window mastic at a property on Putney High Street, Upper Richmond Road and Spencer Walk or anywhere close by, we can help. Putney sits on or near the A3 and B306, so getting to you is simple. Other places close to Putney include Roehampton (1 mile south-west), Barnes (1 mile north-west), Fulham (1 mile north-east), Mortlake (2 miles west) and Wimbledon Park (2 miles south). We also work in nearby towns such as London (6 miles north-east), City of Westminster (5 miles north-east), Marylebone (5 miles north-east), Kensington (3 miles north), St Pancras (6 miles north-east) and Shoreditch (8 miles north-east).
Near you in Putney
Around Putney, our work takes us to homes and buildings near Putney School of Art and Design, Bishops Park and The Railway pub, among other places. Putney has its own railway station: Putney station. Nearby you’ll also find Putney Exchange (less than half a mile east) and Antique Breadboard Museum (under half a mile north-east). Not far away are Henman Hill and Battersea Park Lake.
Nearby places to Putney
More services for Putney
Why deal with it now?
The work is quick compared with the damage it prevents: the visit takes most of a day for a typical house, less for a few frames. Leave it until water is coming in and you may need plastering and decorating as well. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Doing several joints on one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
What you get with us
- Domestic, commercial and hotel work
- A choice of colours where the product allows
- Over 20 years’ experience
- Anti-fungal sanitary silicone in wet areas
Take a look at how sealant jobs are priced or our reviews.
What sealant work can’t fix
It helps to know what we cannot do:
- Draughts through the window seals rather than the frame
- Faulty window hardware
- Condensation trapped between the panes
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before you book.
Where we work in Putney
- Timber windows & doors
- Composite doors
- Aluminium frames
- Window sills
- uPVC windows
- Patio & French doors
Can I do it myself?
A careful DIYer can reseal a simple joint, 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.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.