Greater London · England
Kitts End Window Mastic
Window mastic across Kitts End and nearby, with every bit of old sealant taken out first.
- Gaps left after new windows were fitted
- Cracked or shrunken mastic around the frame
- Black, perished sealant on frames
About our window mastic in Kitts End
Around Kitts End we seal all kinds of frames: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. If you are dealing with cracked internal joints between frame and plaster and mastic that has split away from the wall, we can put it right, whatever the surface.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
We stand behind the work with a one-year guarantee.
- Where
- Kitts End (EN5)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of window mastic
Every job gets its own quote. This is what makes a difference:
- How much there is to do
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- Any working-time requirements on site
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- What’s wrong with the joints now
- Any previous sealing or DIY work
- The type of property
- The rough size of the job
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Also near Kitts End
Also in Kitts End
When to call us in Kitts End
Mastic ages in the weather. Sunlight dries the surface out, until it loses its stretch and starts to crack.
These are the problems we are asked about most:
- Mastic that is falling out in pieces
- A bead that doesn’t match the frame
- Draughts coming in around windows and doors
- Untidy mastic left by window fitters
In the older streets around Parish Church of St Mary the Virgin, the joint between an old wall and a newer frame is usually the first place rain gets in.
What your quote should include
- What guarantee comes with the work
- How much experience the applicator has
- When the joint can take water or movement
- Whether they seal over old material or remove it
What happens if it’s left?
Failed mastic isn’t a reason to replace sound windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. In a flat in Kitts End, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why Kitts End customers choose us
- One-year guarantee on every job
- We never seal over old sealant
- An ARBOMaster approved applicator
- Sealant colour chosen to suit
What we can’t put right
To be straight with you, some problems need a different trade:
- Broken hinges, locks or handles
- Rotten timber, which needs a joiner first
- Worn gaskets, brush seals or a door that has dropped
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Composite doors
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Window sills
- Aluminium frames
Windows and doors in Kitts End
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Kitts End is in London, so parking needs planning: let us know about parking bays, permits or a driveway. If you let a flat or house near Hadley Wood station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Kitts End is about 2 miles south-west of Potters Bar, in Greater London. Kitts End gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. We cover 764 towns and villages across Greater London, large and small. We also work in London, about 13 miles from Kitts End.
Here we cover the EN5 postcode area for window mastic. We also cover the places around Kitts End: Dancers Hill (1 mile north-west), Hadley (1 mile south), High Barnet (1 mile south), South Mimms (2 miles north-west) and Ridge (2 miles north-west). Larger places within reach include London (13 miles south), City of Westminster (11 miles south), Marylebone (11 miles south), Kensington (12 miles south), St Pancras (11 miles south) and Shoreditch (11 miles south-east).
What’s near Kitts End
In Kitts End, that means homes and buildings near King George's Fields (Monken Hadley), Former King William IV Public House and Susi Earnshaw Theatre School and the streets around them. Kitts End’s nearest station is Hadley Wood station, about 1.1 miles east of the centre. Well-known places in the area include Spires Shopping Centre (1.2 miles south) and Potters Bar Museum (1.6 miles north). Not far away are Hadley Green and Darland's Lake.
Kitts End questions
I let a flat near Hadley Wood station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Is Kitts End in your area for window mastic?
Yes. Our work covers London and the South East, and Kitts End is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Can you do upstairs windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
What we do, step by step
We keep the work tidy and contained to the area we are working on. The job normally takes a morning for a couple of windows and a door, and we tell you how long to leave it before we go. In Kitts End, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Try not to wet indoor joints just before the visit
- Keep pets and children clear of the area while we work
How to get a quote
Every job is quoted individually. Just ring 0345 464 0079 or send us an email with the details, and pictures are welcome.
Related advice
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Ventilate rooms so frames don’t stay wet inside
- Keep paint off silicone joints
- Check the mastic once a year
- Avoid harsh chemicals near the mastic
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. A new joint closes it up.