Greater London · England
Selsdon Window Mastic
Professional window mastic in and around Selsdon, with every bit of old sealant taken out first.
- Gaps between the frame and the inside reveal
- Untidy mastic left by window fitters
- Cold air getting in at the frame edge
Window mastic in Selsdon, done properly
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. If the draught is through the window seals instead, we’ll tell you. We work on timber windows & doors, patio & French doors and composite doors, and the jobs we see most are a bead that doesn’t match the frame and hard, cracked sealant around windows. We’re sealant specialists rather than general builders, so window mastic in Selsdon is done by someone who does this every day.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking.
Every job comes with our 12-month guarantee, wherever you are in Greater London.
- Location
- Selsdon (CR2, CR0)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 07833 053749
- Updated
- 26 October 2026
Your questions about window mastic in Selsdon
Can parking be tricky for a visit in Selsdon?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can you help a landlord with a rental near Sanderstead station?
Yes, landlords and agents are among the people we work for. Just ring 07833 053749 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
How many windows can you do in a day?
The work takes a morning for a couple of windows and a door. Access and how stubborn the old mastic is affect the time most.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Where are you based?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
The process
We bring everything the job needs with us, so there’s nothing for you to buy. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take a morning for a couple of windows and a door. In Selsdon, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we’re working on
- Let us know about parking restrictions
Ask for a quote
For window mastic in Selsdon, call 07833 053749 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
When it is not the sealant
In fairness, some problems need a different trade:
- Damp problems in the wall away from the window
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Draughts through the window seals rather than the frame
Not sure which it is? You can phone 07833 053749 or email us and we’ll tell you honestly.
Surfaces we seal
- uPVC windows
- Window sills
- Timber windows & doors
- Composite doors
- Patio & French doors
- Aluminium frames
Nearby places to Selsdon
More services for Selsdon
Looking after it afterwards
To keep the joints looking good and working properly:
- Make sure the drainage slots are not blocked
- Check the mastic once a year
- Don’t paint over the silicone
- Avoid harsh chemicals near the mastic
Check the drainage slots in the frames aren’t blocked, so rain drains out rather than building up at the sealant.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Different surfaces, different methods
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so the joint must stay flexible. The paint or stain needs to be sound where the sealant meets it.
Composite doors
Front doors take the weather head on. Those corners get the most care.
Signs you need window mastic in Selsdon
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
The problems people normally mention when they call are:
- Whistling draughts around closed windows
- Water coming in at the bottom corners of a door
- Gaps where the sill meets the wall
- Black, perished sealant on frames
Letting a property close to Sanderstead station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Before you book anyone
- How the surfaces are prepared before sealing
- Which colour the sealant will be
- How hidden problems are handled
- The length of the guarantee
Landlord and commercial work in Selsdon
We also work for property managers and facilities teams in Selsdon and across Greater London. Several sites can be quoted together, and we are fully insured for the work.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Windows and doors in Selsdon
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Addington Palace (about 1 mile north-east) are a reminder that the area around Selsdon has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as St Francis, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. As a London address, Selsdon can be tricky for parking: let us know about parking bays, permits or a driveway.
Selsdon is about 2 miles south-east of Croydon, in Greater London. Every kind of property in Selsdon can book us for window mastic. The work is guaranteed for a year. Selsdon is one of 786 places in Greater London we cover.
Jobs for window mastic in CR2 and CR0 is quoted and booked the same way as anywhere else. We cover properties on York Road, Byron Road and Abbey Road. If you are just outside Selsdon, we cover Forestdale (1 mile east), Addington (1 mile north-east), Sanderstead (1 mile south-west), Coombe (1 mile north-west) and Farleigh (2 miles south-east). Larger places within reach include London (11 miles north), City of Westminster (12 miles north), Marylebone (13 miles north), Kensington (12 miles north-west), St Pancras (13 miles north) and Shoreditch (13 miles north).
Landmarks near Selsdon
Around Selsdon, our work takes us to homes and buildings near Royal Russell School, The Sir Julian Huxley pub and The Quest Academy, among other places. The closest station to Selsdon is Sanderstead station, about 1.7 miles west of the centre. Other landmarks nearby include St George's Walk (2.7 miles north-west) and Croydon Airport Visitor Centre (2.9 miles west). Not far away are Duppas Hill and Bramley Bank.