Greater London · England
Window Mastic in Parsons Green
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Parsons Green. Fully insured, ARBOMaster approved and guaranteed for a year.
- Black, perished sealant on frames
- Sealant in the wrong colour for the frame
- Hard, cracked sealant around windows
How we handle window mastic in Parsons Green
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. If you have a bead that doesn’t match the frame and old mastic that has gone black or come away, we can put it right.
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, letting in draughts and water.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Parsons Green (SW6, SW10)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Surface by surface
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. The paint or stain needs to be sound where the sealant meets it.
Leave it or put it right?
Draughts and leaks do not always mean new windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we will tell you. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
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.
Why us?
- Tidy, careful work
- Colour agreed with you before we start
- Fully insured
- Approved under the ARBOMaster scheme
Take a look at how sealant jobs are priced and customer reviews.
Common questions in Parsons Green
Can you help a landlord with a rental near Imperial Wharf station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Can parking be tricky for a visit in Parsons Green?
Parking in Parsons Green, 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.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
When is the sealant fully cured?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Do you do commercial work?
Yes. We can plan bigger jobs in stages.
Do you work in Parsons Green?
Yes. We are based in Crawley and work across South East England, London and Scotland, Parsons Green included.
Can you get sealant to suit coloured frames?
Usually, yes. Mention the frame colour when you ask for a quote and we’ll match it as closely as we can.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
How the visit works
All our tools and materials come with us in the van. Once we’ve agreed what’s being done, we protect the area and start. It normally takes a morning for a couple of windows and a door. For a job in Parsons Green, 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.
- 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.
How to prepare
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
- Let us know about earlier repairs to the joints
Ask for a quote
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Read more
Signs you need window mastic in Parsons Green
Timber windows bring their own problems. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
If you can see any of these, it’s time to have the joints looked at:
- Old mastic that has gone black or come away
- Draughty joints inside around the window
- Damp patches on the reveal after heavy rain
- Untidy mastic left by window fitters
Parsons Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What to look for in a quote
- Who turns up on the day
- How long to leave it before use
- How long the guarantee is
- How hidden problems are handled
Towns and villages near Parsons Green
Other services in Parsons Green
What we can’t put right
Before booking, it’s worth knowing the limits too:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Rotten timber, which needs a joiner first
- A door that needs adjusting, rehanging or new seals
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
What we seal
- Window sills
- Patio & French doors
- uPVC windows
- Composite doors
- Timber windows & doors
- Aluminium frames
Windows and doors in Parsons Green
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
Schools such as Lady Margaret School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. For an older house near a landmark such as St Dionis, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Parsons Green is about 2 miles south of Kensington, in Greater London. Jobs in Parsons Green get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 764 places across Greater London, large and small.
We cover every part of SW6 and SW10 for window mastic. Local streets include Buer Road, Vera Road and Ewald Road, and we cover them all. Being close to the A304, Parsons Green is simple for us to get to for window mastic. We also cover Hurlingham (1 mile south), Walham Green (1 mile north-east), Chelsea Harbour (1 mile east), Sands End (1 mile east) and West Brompton (1 mile north). Within a short drive, we also cover London (5 miles east), City of Westminster (3 miles north-east), Marylebone (4 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles north-east) and Walthamstow (11 miles north-east).
Local landmarks in Parsons Green
Typical jobs here are in homes near Natural History Museum Library and Archives, Parsons Green (park) and The White Horse pub and the streets around them. Also close by are Holy Cross RC School (under half a mile north) and Queensmill School (less than half a mile south-east). The closest station to Parsons Green is Imperial Wharf station, roughly 0.7 miles east of the centre. Other landmarks nearby include Baynard's Castle (5 miles north-east) and Western Hospital (0.8 miles north). The countryside around Parsons Green includes WWT London Wetland Centre and Campden Hill.
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Parsons Green and across Greater London. Several sites can go on one quote, and we are fully insured for the work.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.