Greater London · England
Window & door mastic in Botany Bay, Greater London
Problem with your window and door frames in Botany Bay? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Untidy mastic left by window fitters
- Cracked sealant at the sill ends
- Cold air getting in at the frame edge
About our window mastic in Botany Bay
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. Common call-outs are for gaps between the frame and the inside reveal and old mastic that has gone black or come away, across timber windows & doors, uPVC windows and composite doors.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
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.
- Location
- Botany Bay (EN2)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
We bring everything the job needs with us, so you don’t need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for a handful of frames, longer for a whole house. In a London area like Botany Bay, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- On commercial sites, let us know about site rules
- Clear items away from the joints we’re working on
Getting a quote
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Clear any debris from frame drain holes
- Ventilate rooms so frames do not stay wet inside
- Walk round the house once a year and look at the joints
- Keep jet washers away from the mastic
Silicone cannot generally be painted, so if you’re planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
Surface by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it, where a rigid one would crack.
What happens if it’s left?
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Botany Bay, the repair is bigger than a sealant job.
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Why choose Mr Mastic in Botany Bay
- Anti-fungal silicone where joints get wet
- ARBOMaster approved applicator
- Colour agreed with you before any work starts
- Colour picked to suit the job
Read our cost guide and customer reviews.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- A frame that has rotted at the joint
- A door that needs adjusting, rehanging or new seals
- A sash or casement that will not close properly
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Window sills
- Timber windows & doors
- Composite doors
- Patio & French doors
- Aluminium frames
- uPVC windows
Quotes for window mastic in Botany Bay
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Which sealant suits the joint
- Any mould that needs treating
- The old material and how stubborn it is
- The number and length of the joints
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and agree the price before starting.
What to tell us for a quote
To help us quote quickly, let us know:
- Where the job is, and your postcode
- Any previous sealing or DIY work
- The rough size of the job
- The problem you’ve noticed
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Nearby places to Botany Bay
More services for Botany Bay
FAQs for Botany Bay
Can parking be tricky for a visit in Botany Bay?
Parking in Botany Bay, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
I let a flat near Crews Hill station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
Does the work come with a guarantee?
Yes, for 12 months. Keeping drainage clear and checking the joints yearly helps them last.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Can new window sealant be painted?
Not normally, if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Windows and doors in Botany Bay
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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
As a London address, Botany Bay can be tricky for parking: let us know about parking bays, permits or a driveway. Historic houses such as Forty Hall, about 2.5 miles east, show how far back building around Botany Bay goes, and older homes nearby need a sealant that suits their walls.
Botany Bay is about 3 miles south-east of Potters Bar, in Greater London. Whether you’re in the middle of Botany Bay or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, Botany Bay among them. London is on our list too, about 12 miles from Botany Bay.
Postcode districts we cover here for window mastic: EN2. Local streets include The Ridgeway and East Lodge Lane, and we cover them all. Being close to the A1005, Botany Bay is easy for our applicators to reach for window mastic. Close by, we work in Northaw Valley (1 mile north-west), Cockfosters (2 miles south-west), Grange Park (2 miles south-east), Hadley Wood (2 miles south-west) and World's End (2 miles south). We also work in nearby towns such as London (12 miles south), City of Westminster (11 miles south), Marylebone (11 miles south), Kensington (13 miles south), St Pancras (10 miles south) and Shoreditch (11 miles south).
Near you in Botany Bay
Locally, jobs take us to homes and businesses close to The Robin Hood pub, Trent Park and Highlands School. Botany Bay’s nearest station is Crews Hill station, roughly 1 mile north-east. Well-known places in the area include Museum of Enfield (2.7 miles south-east) and Chase Farm Hospital (1.2 miles south-east). Not far away are Fir and Pond Woods and Bowyer's Water.
Signs you need window mastic in Botany Bay
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
Signs it’s time to call us include:
- Sealant in the wrong colour for the frame
- Mastic that has split away from the wall
- Gaps left after new windows were fitted
- Gaps where the sill meets the wall
Rented homes near Crews Hill station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Before you book anyone
- The length of the guarantee
- Whether they seal over old material or remove it
- Which sealant they’ll use, and why
- Whether you can choose the colour