Greater London · England
Well Hill Window Mastic
Problem with your window and door frames in Well Hill? We remove the old material, prepare the joints and seal them properly.
- Rain getting in at the frame or under the sill
- Rushed sealant from a window installation
- Draughty joints inside around the window
Window mastic in Well Hill, done properly
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so deep gaps get backing rod first. The sealant then grips the two sides it should. If you have gaps left after new windows were fitted and mastic that’s falling out in pieces, we can help, on uPVC windows, patio & French doors and timber windows & doors alike.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking.
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.
- Place
- Well Hill (BR6)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work can’t fix
New sealant cannot fix everything, and we will tell you before work begins. Sealant will not put right:
- A door that needs adjusting, rehanging or new seals
- Broken hinges, locks or handles
- Condensation trapped between the panes
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Surfaces we seal
- Patio & French doors
- Aluminium frames
- Composite doors
- Window sills
- Timber windows & doors
- uPVC windows
Leave it or put it right?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Well Hill, the repair is bigger than a sealant job.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll go through it with you.
What you get with us
- We agree the colour with you first
- A sealant colour to suit the surroundings
- White, clear, grey or coloured to suit, where the product allows
- Every job guaranteed for a year
Landlord and commercial work in Well Hill
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
How it works
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take a few hours for a handful of frames, longer for a whole house. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Well Hill. It helps if you can point us to a visitor permit or a bay close to the door.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
Ask for a quote
Asking for a quote is easy: let us know the job and the location. A few pictures by email make the job easier to understand.
Related advice
Well Hill: your questions answered
Do you cover Well Hill for window mastic?
Yes, Well Hill is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Is parking an issue for window mastic in Well Hill?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Well Hill, along with the rest of our area.
Can new window sealant be painted?
It depends on the sealant. Some hybrid sealants can be painted; silicone can’t. Tell us if you are decorating and we’ll choose accordingly.
What does window mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or drop us an email with a short description of the job.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
Do you have insurance?
Yes, we are fully insured.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
What we are called out for in Well Hill
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’re asked about most:
- Cracked sealant at the sill ends
- A bead that does not match the frame
- Gaps left after new windows were fitted
- Black, perished sealant on frames
Rented homes near Knockholt station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Before you book anyone
- What the cure time is
- How hidden problems are handled
- Whether you can choose the colour
- Whether all the old sealant comes out first
Keeping the joints in good condition
After the cure time, these simple habits help:
- Clear any debris from frame drain holes
- Keep paint off silicone joints
- Ventilate rooms so frames don’t stay wet inside
- Use gentle cleaners on frames and sealant
Most silicone sealants won’t take paint, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.
How we quote for window mastic
Call for a quick quote. What matters most is:
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- How many areas need sealing
- Working hours on commercial sites
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first.
Helping us quote
You don’t need to know the technical terms. Just tell us:
- Whether it’s a home or a business
- Photos by email, if that is easy
- The address or postcode of the job
- What’s wrong with the joints now
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
Frames and glazing around Well Hill
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. Historic houses like Lullingstone Castle (about 2 miles east) are a reminder that the area around Well 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’s traditional sand mastic.
As a London address, Well Hill can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For site and facilities teams at buildings such as Chelsfield Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Well Hill is about 3 miles south-east of Orpington, in Greater London. Every kind of property in Well Hill is covered for window mastic, old or new, large or small. The work is guaranteed for a year. We cover 764 towns and villages across Greater London. London is on our list too, around 14 miles away.
Jobs for window mastic in BR6 works the same way as everywhere else we cover. Whether your property is on Well Hill, Pump Lane and Firmingers Road or anywhere close by, our applicators can take on the job. Other places close to Well Hill include Maypole (1 mile west), Bopeep (1 mile south-west), Chelsfield (1 mile west), Badgers Mount (1 mile south) and Goddington (2 miles west). We also work in nearby towns such as London (14 miles north-west), Shoreditch (15 miles north-west), Whitechapel (15 miles north-west), Stockwell (14 miles north-west), Orpington (3 miles north-west) and Plaistow (13 miles north-west).
Landmarks near Well Hill
Around Well Hill, our work takes us to homes and buildings near Harris Academy Orpington, Hewitt's Chalk Bank and The Rock And Fountain Public House. Well Hill’s nearest station is Knockholt station, about 1.1 miles south-west of the centre. Other landmarks nearby include Lullingstone Castle (2 miles east) and London Borough of Bromley Museum (2.5 miles north-west). Not far away are The Warren.