Greater London · England
Seething Wells Window Mastic
Problem with your window and door frames in Seething Wells? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Sealant in the wrong colour for the frame
- Gaps where the sill meets the wall
- Water coming in at the bottom corners of a door
Why it’s worth doing now in Seething Wells
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. Resealing now is a small job by comparison. In a flat in Seething Wells, 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.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Why book with us
- We leave the area clean and tidy
- White, clear, grey or coloured to suit, where the product allows
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
Read our cost guide or what customers say.
Window mastic in Seething Wells
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that cannot move properly, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. If you’re dealing with black, perished sealant on frames and cracked internal joints between frame and plaster, we can put it right, on timber windows & doors, window sills and aluminium frames alike.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking, and access in Seething Wells is something to talk through when you book.
All of our work is guaranteed for twelve months, in Seething Wells and everywhere else we cover.
- Location
- Seething Wells (KT6, KT1, KT7)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
A little care helps the new joints last. We recommend:
- Keep solvents and bleach off the sealant
- Look round the frames every year or so
- Keep timber frames painted
- Keep paint off silicone joints
Most silicone sealants won’t take paint, so mention any painting plans before we start. There are paintable sealants for joints that need it.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
What we’re called out for in Seething Wells
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, while a joint packed solid can’t stretch. That’s what backing rod is for.
People generally contact us when they notice one of these:
- Gaps where the sill meets the wall
- Whistling draughts around closed windows
- Mastic that has split away from the wall
- Cracked internal joints between frame and plaster
If you look after a building such as Maple Infants' School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- Is VAT in the price?
- Which colour the sealant will be
- Whether the sealant suits the joint
- What happens if the job turns out different
Towns and villages near Seething Wells
More services for Seething Wells
Surface by surface
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. We’ll point out any rot we find, as that is a job for a joiner.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the threshold joint takes a lot of water. We prepare and reseal every joint, backing the deep ones.
Your questions about window mastic in Seething Wells
I let a flat near Surbiton station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Do you cover Seething Wells for window mastic?
Yes, Seething Wells is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear quote.
Are you insured?
Yes, we’re fully insured for every job we do.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Where is Mr Mastic based?
We are based in Crawley, and we work across South East England, London and Scotland.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Quotes for window mastic in Seething Wells
Every job gets its own quote. These are the things that affect it:
- How many areas need sealing
- The size of the job
- When we can work, for business premises
- How easy the joints are to reach
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll go through it with you.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Where the property is
- Whether it’s a home or a business
- The problem you’ve noticed
- Whether it has been sealed before
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before work begins. Most jobs take most of a day for a typical house, less for a few frames. In Seething Wells, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
- Move anything stored near the joints
How to get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved and send you a clear quote.
Related advice
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Seething Wells homes and the weather
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. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
As a London address, Seething Wells can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Homes close to St Andrew's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Seething Wells is about 4 miles north-west of Ewell, in Greater London. Every kind of property in Seething Wells is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 764 places across Greater London. London is on our list too, about 12 miles from Seething Wells.
We cover every part of KT6, KT1 and KT7 for window mastic and the streets around it. That includes homes and businesses on Maple Road, Grove Road and North Road and the roads around them. Other places close to Seething Wells include Surbiton Park (1 mile north-east), Long Ditton (1 mile south), Thames Ditton (1 mile west), Ditton Hill (1 mile south) and Weston Green (1 mile west). Further out, we also cover London (12 miles north-east), City of Westminster (11 miles north-east), Marylebone (11 miles north-east), Kensington (9 miles north-east), St Pancras (12 miles north-east) and Shoreditch (14 miles north-east).
Local landmarks in Seething Wells
Typical jobs here are in homes near The Hollyfield School and Sixth Form Centre, The City Arms and Hampton Court Park, among other places. There’s a railway station in Seething Wells itself: Surbiton station. A little further out are Chessington Castle Hill (2.6 miles south) and Metropolitan Police Mounted Branch Museum (1.6 miles west). For a walk, there’s The Wood and Kingston Hill Road area.