Greater London · England
Window Mastic in St Paul's Cray
Mastic around window and door frames, sills and patio doors in St Paul's Cray, with a one-year guarantee on every job. Ask us for a quote.
- Draughty joints inside around the window
- Mastic that is falling out in pieces
- Whistling draughts around closed windows
Why deal with it now?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in St Paul's Cray.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will explain what it covers.
What you get with us
- You choose the colour before work begins
- Trusted Arbo and Everbuild sealants
- Neat joints and a tidy finish
- Approved under the ARBOMaster scheme
Read our cost guide or our reviews.
How we handle window mastic in St Paul's Cray
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. Typical jobs include whistling draughts around closed windows and black, perished sealant on frames, across composite doors, 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. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
Each job carries a 12-month guarantee, large or small.
- Location
- St Paul's Cray (BR5, BR7)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
St Paul's Cray questions
Can parking be tricky for a visit in St Paul's Cray?
Parking in St Paul's Cray, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you work for landlords with property near St Mary Cray station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Can you do upstairs windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Does the work come with a guarantee?
Yes. All our work carries a 12-month guarantee, and we are ARBOMaster approved applicators.
Can you match the sealant to my frames?
Yes. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Can resealing stop a draught around my window?
If the draught is coming in around the frame, yes. If it’s through the window’s own seals or a hinge, that is a different fix, and we will say so.
Do you cover St Paul's Cray?
We do. Our applicators work in St Paul's Cray.
How it works
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours for a few frames, or a day or more for a whole house. For a job in St Paul's Cray, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Where the joints are inside, avoid wetting them before we arrive
- For business premises, tell us about site rules or sign-in
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work.
Advice
Window mastic in St Paul's Cray: local notes
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Historic houses like Bromley Palace (about 3.7 miles west) are a reminder that the area around St Paul's Cray 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 is traditional sand mastic.
St Paul's Cray is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Letting a property close to St Mary Cray station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you live in an older home near St Barnabas, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
St Paul's Cray is about 1 mile north of Orpington, in Greater London. Whether you are in the middle of St Paul's Cray or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. We cover 764 towns and villages across Greater London, from the larger towns to small villages. We also work in London, around 11 miles away.
Work in BR5 and BR7 works the same way as everywhere else we cover. If you need window mastic at a property on Main Road, Murray Road and Rushet Road or anywhere close by, we can help. If you’re just outside St Paul's Cray, we cover St Mary Cray (1 mile south), Poverest (1 mile south), Derry Downs (1 mile south), Orpington (1 mile south) and Kevington (2 miles south-east). Within a short drive, we also cover London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north-west).
Near you in St Paul's Cray
We work in homes and buildings around Kemnal Technology College, The Blue Anchor Public House and Walsingham School, among other places. There’s a railway station in St Paul's Cray itself: St Mary Cray station. Well-known places in the area include Lullingstone Castle (4.8 miles south-east) and London Borough of Bromley Museum (1.5 miles south). The countryside around St Paul's Cray includes The Warren and Summer Hill.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
When it isn’t the sealant
New sealant can’t fix everything, and we will tell you before work begins. Sealant won’t put right:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Broken hinges, locks or handles
- Damp coming through the wall itself rather than the frame joint
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Window sills
- Aluminium frames
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Composite doors
Places near St Paul's Cray
Also in St Paul's Cray
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Different surfaces, different methods
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. We will point out any rot we find, as that is a job for a joiner.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Don’t use solvent cleaners on the joint
- Don’t paint over the silicone
- Use gentle cleaners on frames and sealant
- Walk round the house once a year and look at the joints
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.