Greater London · England
Window Mastic in South Acton
Mastic around window and door frames, sills and patio doors for homes and businesses in South Acton and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- White mastic on grey or black frames
- Mastic that is falling out in pieces
- Whistling draughts around closed windows
What affects the cost of window mastic
Your quote is based on your job. We look at:
- Which sealant suits the joint
- Working hours on commercial sites
- How much old sealant there is and how hard it is to remove
- Whether there’s mould to deal with
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Asking for a quote
When you contact us, these details help:
- Whether it has been sealed before
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- The type of property
We quote each job on its own. Simply ring 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
Window mastic in South Acton, done properly
Most frames have an outside joint and an inside one. The external joint is the weather seal; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. We work on patio & French doors, window sills and uPVC windows, and common reasons people get in touch are cold air getting in at the frame edge and rain getting in at the frame or under the sill.
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.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- South Acton (W3, W5, W4)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that without cracking.
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Common questions in South Acton
Is South Acton in your area for window mastic?
Yes. Our work covers London and the South East, and South Acton is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Is parking a problem for a job in South Acton?
Parking in South Acton, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints.
Where are you based?
Mr Mastic is based in Crawley. We cover South Acton and the rest of Greater London.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
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 call 0345 464 0079 or send us an email.
Do you work for letting agents?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels.
Will resealing my frames help with draughts?
In many cases. Air often gets in between the frame and the wall, and resealing inside and out closes it.
Signs you need window mastic in South Acton
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
These are the problems we are asked about most:
- Draughty joints inside around the window
- Hard, cracked sealant around windows
- Mastic that is falling out in pieces
- White mastic on grey or black frames
If you look after a building such as Ark Acton Academy, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- Whether they seal over old material or remove it
- How hidden problems are handled
- Whether the sealant suits the joint
- How long to leave it before use
Windows and doors in South Acton
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. With historic houses such as Gunnersbury Park (about 0.3 miles south-west) nearby, there’s older building stock in the area around South Acton as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
As a London address, South Acton can be tricky for parking: let us know about parking bays, permits or a driveway. Rented homes near South Acton station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
South Acton is about 1 mile south-west of Acton, in Greater London. We provide window mastic to homeowners, landlords and businesses in South Acton, as part of our work across Greater London. South Acton is one of 764 places in Greater London where we work for window mastic. Our London page covers work nearby (8 miles or so).
Every address in W3, W5 and W4 is covered for window mastic, from the main roads to the quietest streets. Whether your property is on Power Road, Bollo Lane and Pope's Lane or anywhere close by, our applicators can take on the job. Nearby, we also carry out window mastic in Acton Green (1 mile east), Bedford Park (1 mile east), Acton (1 mile north-east), Hanger Hill (1 mile north) and Acton Vale (2 miles east). Larger places within reach include London (8 miles east), City of Westminster (6 miles east), Marylebone (6 miles east), Kensington (4 miles east), St Pancras (7 miles east) and Shoreditch (9 miles east).
Around South Acton
Locally, jobs take us to homes and businesses close to Leap Service - the National Autistics Society, Berrymede Junior School and Library for Iranian Studies. Other local landmarks include Clayton Hotel Chiswick (0.6 miles south-east) and Gunnersbury Park (within half a mile south-west). For rail, the closest station is South Acton station, about 0.7 miles east. Other landmarks nearby include Livat Hammersmith (2.6 miles east) and Gunnersbury Park House - Large Mansion (less than half a mile south). Green spaces nearby include Castlebar Hill and Kew Gardens Lake.
When something else is needed
It helps to know what we cannot do too:
- Worn gaskets, brush seals or a door that has dropped
- Damp problems in the wall away from the window
- Faulty window hardware
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before booking.
Where we work in South Acton
- Patio & French doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
- Timber windows & doors
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Do not paint over the silicone
- Keep drainage slots and sill grooves clear
- Air rooms to keep condensation down around windows
- Keep paint and stain on wooden frames in good order
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. Resealing closes it.
What happens on the day
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a handful of frames, longer for a whole house. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Mention any tricky access
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, ring 0345 464 0079 or send us an email.
Advice
Also near South Acton
Also in South Acton
Why it’s worth doing now in South Acton
The work is quick compared with the damage it prevents: it takes most of a day for a typical house, less for a few frames. Wait for damp to appear and there may be plaster and decorating to sort out too. In a flat in South Acton, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- You choose the colour before work begins
- Domestic, commercial and hotel work
- Full insurance on every job
- Over 20 years’ experience
See our cost guide or our reviews.