Greater London · England
Orpington Window Mastic
Window mastic for Orpington, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps left after new windows were fitted
- Mastic that has split away from the wall
- Old mastic that has gone black or come away
How it works
At the end, we look at the finished work together. The work normally takes a morning for a couple of windows and a door, depending on how much there is to do. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
- Let us know about stairs, lifts or work at height
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Advice
Window mastic for homes and businesses in Orpington
There are two joints on most windows. The external joint is the weather seal; inside, the joint between frame and plaster stops draughts and tidies the reveal. Either or both can be done. We’re often asked to deal with sealant in the wrong colour for the frame and mastic that’s falling out in pieces, across aluminium frames, patio & French doors and uPVC windows.
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.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Orpington (BR5, BR6, BR7, DA14)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Also near Orpington
Other services in Orpington
What window mastic looks like in Orpington
Historic houses like Bromley Palace (about 3.8 miles west) are a reminder that the area around Orpington has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
If you live in an older home near St Andrew's, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Orpington is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Orpington is about 12 miles south-east of London, in Greater London. If you need window mastic in Orpington, please ring 0345 464 0079 or drop us an email for a quick quote. We cover Greater London from our Crawley base. Orpington is one of 764 places in Greater London where we work. London is on our list too, around 12 miles away.
Work in BR5, BR6, BR7 and DA14 is quoted and booked the same way as anywhere else. Streets in the area include High Street, Furzehill Square and Station Road, and we cover them all. With the A224 and B258 close by, Orpington is simple for us to get to. We also cover the places around Orpington: Poverest (1 mile north), Derry Downs (1 mile east), St Mary Cray (1 mile north), St Paul's Cray (1 mile north) and Goddington (1 mile south). We also work in nearby towns such as London (12 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (13 miles north-west).
Landmarks near Orpington
Around Orpington, our work takes us to homes and buildings near The Priory School, Jubilee Country Park and Harris Academy Orpington. Orpington’s nearest station is St Mary Cray station, roughly 0.7 miles north of the centre. Well-known places in the area include Lullingstone Castle (4.4 miles south-east) and Orpington Hospital (1.5 miles south). The countryside around Orpington includes The Warren and Summer Hill.
Why deal with it now?
Resealing frames is a short job: it takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. In a flat in Orpington, 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.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- Rated 4.9 stars on Google
- Approved under the ARBOMaster scheme
- White, clear, grey or coloured to suit, where the product allows
- Trusted Arbo and Everbuild sealants
Read our cost guide and what customers say.
Do you need window mastic in Orpington?
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
It’s worth asking for a quote if you see:
- Gaps where the sill meets the wall
- Gaps left after new windows were fitted
- Water coming in at the bottom corners of a door
- Black, perished sealant on frames
Managing a site like Perry Hall Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Before you book anyone
- What happens if the job turns out different
- Who does the work, and how experienced they are
- Whether the sealant suits the joint
- When the joint can take water or movement
When something else is needed
New sealant can’t fix everything, and we will tell you before work begins. It will not solve:
- Broken hinges, locks or handles
- A failed sealed unit that has misted up
- Rotten timber, which needs a joiner first
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Timber windows & doors
- Window sills
- Composite doors
- uPVC windows
- Patio & French doors
- Aluminium frames
Your questions about window mastic in Orpington
Do you cover Orpington for window mastic?
Yes. Our work covers London and the South East, and Orpington is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Is parking an issue for window mastic in Orpington?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you work for letting agents?
Yes. We work in homes, commercial premises and hotels, and we are fully insured.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
How long will my window job take?
That depends on the number of frames, how they’re reached and the state of the old mastic. We will tell you how long your job needs when we quote.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- The type of sealant required
- Whether the work is at height
No two jobs are quite the same, 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.
Helping us quote
To help us quote quickly, please include:
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
- Roughly how big the job is
Want a quote for window mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before we start.
Landlord and commercial work in Orpington
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for property managers and facilities teams in Orpington and across Greater London. Several sites can be quoted together, and we are fully insured.