Greater London · England
Window & door mastic in Forestdale, Greater London
Specialist window mastic for Forestdale: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Water coming in at the bottom corners of a door
- Draughts coming in around windows and doors
- Draughty joints inside around the window
Forestdale questions
I let a flat near Sanderstead station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Is parking a problem for a job in Forestdale?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
How long does it take to reseal the windows on a house?
A few frames take a few hours, while a whole house takes longer. We confirm the timing with your quote.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Can you reach windows above the ground floor?
Yes, where they can be reached safely. Tell us about access when you get in touch so we can plan the job.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames normally suit brown.
Window mastic for homes and businesses in Forestdale
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through. Where the air is getting in through the window itself, we will say so. If you have leaking joints at the ends of sills and sealant in the wrong colour for the frame, we can put it right.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Forestdale as anywhere.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Place
- Forestdale (CR0, CR2)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
All our tools and materials come with us in the van. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for a handful of frames, longer for a whole house. In Forestdale, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Preparing for the visit
- Mention any parking rules near the property
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Advice
Nearby places to Forestdale
What else we do in Forestdale
DIY sealant or a professional job?
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 does not work out, we can still put it right.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Windows and doors in Forestdale
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. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Forestdale 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 Sanderstead station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. For an older house near a landmark such as St Francis, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Forestdale is about 3 miles south-east of Croydon, in Greater London. Across the CR0 area, we can carry out window mastic at your property. 764 places in Greater London are on our list, large and small. There’s also a page for London, about 11 miles away.
Here we cover the CR0 and CR2 postcode area for window mastic. Whether your property is on Courtwood Lane, Goldfinch Road and Bardolph Avenue or anywhere close by, our applicators can take on the job. If you’re just outside Forestdale, we cover Selsdon (1 mile west), New Addington (1 mile east), Addington (1 mile north), Farleigh (1 mile south) and Fickleshole (2 miles south-east). Larger places within reach include London (11 miles north), City of Westminster (13 miles north-west), Marylebone (13 miles north), Kensington (13 miles north-west), St Pancras (13 miles north) and Shoreditch (13 miles north).
Near you in Forestdale
Typical jobs here are in homes near John Ruskin College and Addington Park. For rail, the closest station is Sanderstead station, about 2.4 miles west of the centre. Nearby you’ll also find Warlingham Park Hospital (1.9 miles south) and Croydon Airport Visitor Centre (3.5 miles west). Not far away are Nore Hill and Hutchinson's Bank.
Landlord and commercial work in Forestdale
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
What happens if it’s left?
Running fresh sealant over the old joint is tempting, but it will not grip old, dirty sealant. It peels before long, and water still gets in behind. The old mastic has to come out. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Forestdale.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Why us?
- ARBOMaster approved applicator
- A sealant colour to suit the surroundings
- White, clear, grey or another colour, product permitting
- You choose the colour before work begins
Read what affects the cost and customer reviews.
Surface by surface
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Wash the frames with mild soapy water
- Walk round the house once a year and look at the joints
- Avoid blasting the frames with a pressure washer
- Do not use solvent cleaners on the joint
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early.
Leaks generally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
What sealant work cannot fix
New sealant can’t fix everything, and we will tell you before any work starts. Sealant won’t put right:
- A failed sealed unit that has misted up
- A frame that has rotted at the joint
- Damp problems in the wall away from the window
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Composite doors
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- uPVC windows
- Window sills