Greater London · England
Window Mastic in Bromley Common
Window mastic for Bromley Common, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Leaking joints at the ends of sills
- A bead that doesn’t match the frame
- Mastic that has split away from the wall
FAQs for Bromley Common
I let a flat near Bickley station. Can you help?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
Can you do window mastic in Bromley Common?
Yes, Bromley Common is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will send you a clear quote.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Do you guarantee window mastic?
Yes, with our 12-month guarantee. Keeping drainage clear and checking the joints yearly helps them last.
Can you do the inside joint as well?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
Window mastic in Bromley Common, done properly
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 we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you have water coming in at the bottom corners of a door and cold air getting in at the frame edge, we can put it right, whatever the surface.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Bromley Common (BR2, BR1)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of window mastic
Call for a quick quote. What matters most is:
- How easy the joints are to reach
- Working hours on commercial sites
- How much old sealant there is and how hard it is to remove
- How many areas need sealing
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What we need to know
Before you ask for a quote, have a think about:
- Photos by email, if that is easy
- If someone has resealed it before
- How we’d reach the joints
- The type of property
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or send us an email with the details, and photos are welcome.
When to call us in Bromley Common
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 can’t keep up eventually tears.
Keep an eye out for any of the following:
- Cold air getting in at the frame edge
- Mastic that has split away from the wall
- Black, perished sealant on frames
- Draughty joints inside around the window
In the older streets around Holy Trinity Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before booking
- What guarantee comes with the work
- What the quote includes, VAT included or not
- How long to leave it before use
- What insurance they hold
What window mastic looks like in Bromley Common
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Letting a property close to Bickley station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. For site and facilities teams at buildings such as Trinity Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Bromley Common is about 2 miles south-east of Bromley, in Greater London. Jobs in Bromley Common get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Bromley Common is one of 764 places in Greater London where we work. London is on our list too, about 10 miles from Bromley Common.
All of BR2 and BR1 is within our area for window mastic, from the main roads to the quietest streets. That includes homes and businesses on Pope Road, Crown Lane and Church Lane. If you are just outside Bromley Common, we cover Southborough (1 mile north-east), Hayes (1 mile south-west), Locksbottom (1 mile south-east), Shortlands (2 miles north-west) and Keston (2 miles south). Within a short drive, we also cover London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (13 miles north-west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).
Landmarks near Bromley Common
Locally, jobs take us to homes and businesses close to Norman Park, The Chequers Public House and Bishop Justus CofE School and the streets around them. For rail, the closest station is Bickley station, roughly 1.2 miles north. Well-known places in the area include Bridgeways Day Hospital (less than half a mile east) and Bethlem Museum of the Mind (under half a mile south-west). Green spaces nearby include Summer Hill and Downham Woodland Walk.
Should I try it myself first?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
For landlords and businesses
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.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
When it isn’t the sealant
New sealant can’t fix everything, and we’ll tell you before any work starts. Sealant will not put right:
- Soft or decayed wood in the frame
- Damp coming through the wall itself rather than the frame joint
- Condensation trapped between the panes
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Surfaces we seal
- Timber windows & doors
- uPVC windows
- Composite doors
- Window sills
- Patio & French doors
- Aluminium frames
What the job involves on each surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal and we avoid acetoxy silicones, which can react with some metals. We use a neutral-cure product.
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. We cut it out, back any deep gaps and reseal properly.
What we do, step by step
There is not much for you to do on the day. Show us the job and we will take it from there. The work itself takes a few hours for a handful of frames, longer for a whole house, including the tidy-up. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Bromley Common. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
- Let us know about earlier repairs to the joints
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or email us.