Greater London · England
Window & door mastic in Gipsy Hill, Greater London
Professional window mastic in and around Gipsy Hill, with old sealant always removed completely.
- Gaps where the sill meets the wall
- Sealant in the wrong colour for the frame
- Mastic that’s falling out in pieces
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Window mastic for homes and businesses in Gipsy Hill
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. If you have rain getting in at the frame or under the sill and a bead that doesn’t match the frame, we can put it right, on timber windows & doors, patio & French doors and aluminium frames alike.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Place
- Gipsy Hill (SE19, SE27, SE21)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Gipsy Hill
If you manage several properties in or around Gipsy Hill, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
What we do, step by step
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the job takes a few hours for a handful of frames, longer for a whole house for a typical job. In Gipsy Hill, 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.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- Let us know about parking restrictions
- Clear the area around the work
- Try not to wet indoor joints just before the visit
How to get a quote
There’s no standard price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or drop us an email.
Advice
Why deal with it now?
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 Gipsy Hill, 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.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Why book with us
- Over 20 years’ experience
- You choose the colour before work begins
- 4.9 on Google from 180+ five-star reviews
- A choice of colours where the product allows
Read our cost guide or what customers say.
Gipsy Hill questions
Is parking a problem for a job in Gipsy Hill?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Is Gipsy Hill in your area for window mastic?
Yes. Our work covers London and the South East, and Gipsy Hill is part of that. Just call 0345 464 0079 or email us with a few details of the job.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or email us.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Can you match the sealant to my frames?
Yes, in most cases. Tell us the frame colour when you get in touch and we will use the nearest match.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
Gipsy Hill homes and the weather
Historic houses like Kingswood House (about 0.5 miles north) are a reminder that the area around Gipsy Hill has older buildings as well as new. 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. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
In the older streets around Christ Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Rented homes near Gipsy Hill station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Gipsy Hill is about 3 miles south-east of Stockwell, in Greater London. Our applicators cover window mastic for homeowners, landlords and businesses in Gipsy Hill and nearby. Gipsy Hill is one of 764 places in Greater London where we work for window mastic.
Every address in SE19, SE27 and SE21 is within our area for window mastic. You will find streets such as Dover Road, Gipsy Road and Berry Lane, all of which we cover. We also cover the places around Gipsy Hill: Upper Norwood (1 mile south-west), Norwood New Town (1 mile south-west), West Norwood (1 mile north-west), Crystal Palace (1 mile east) and West Dulwich (1 mile north). Further out, we also cover London (5 miles north), City of Westminster (7 miles north-west), Marylebone (7 miles north), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Around Gipsy Hill
Around Gipsy Hill, our work takes us to homes and buildings near Gipsy Hill Tavern, Hillcrest and Virgo Fidelis Convent Senior School and the streets around them. There’s a railway station in Gipsy Hill itself: Gipsy Hill station. A little further out are Whitgift Centre (3.3 miles south) and St Christopher's Hospice (1.2 miles east). The countryside around Gipsy Hill includes Knight's Hill and Dulwich Upper Wood.
Nearby places to Gipsy Hill
What else we do in Gipsy Hill
How to look after the new joints
To keep the joints looking good and working properly:
- Repaint timber before it’s bare
- Wash the frames with mild soapy water
- Keep solvents and bleach off the sealant
- Keep jet washers away from the mastic
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Common problems we fix in Gipsy Hill
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. A sealant that cannot keep up eventually tears.
These are the problems we’re asked about most:
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
- Untidy mastic left by window fitters
As a London address, Gipsy Hill can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
- Whether all the old sealant comes out first
- Whether they’re fully insured
Honest limits
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Damp coming through the wall itself rather than the frame joint
- Broken hinges, locks or handles
- A failed sealed unit that has misted up
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Timber windows & doors
- Window sills
- Patio & French doors
- Aluminium frames
- Composite doors
- uPVC windows