Greater London · England
Window Mastic in Newington Green
Window mastic in Newington Green from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cold air getting in at the frame edge
- Mastic that’s falling out in pieces
- Mastic that has split away from the wall
Window mastic in Newington Green, done properly
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. If you have untidy mastic left by window fitters and whistling draughts around closed windows, we can help, whatever the surface.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Newington Green.
All our work comes with our 12-month guarantee, wherever you are in Greater London.
- Place
- Newington Green (N16, N1, N5)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Why it’s worth doing now in Newington Green
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
What you get with us
- We never seal over old sealant
- More than 20 years in sealant work
- You choose the colour before work begins
- A choice of colours where the product allows
Take a look at how sealant jobs are priced or what customers say.
Landlords, agents and businesses in Newington Green
If you manage several properties in or around Newington Green, several properties can be quoted together. Send us the addresses and the work at each.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Newington Green: your questions answered
Do you work for landlords with property near Canonbury station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
Can parking be tricky for a visit in Newington Green?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Can you seal the gap between the frame and the plaster indoors?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Where are you based?
Our base is in Crawley, and we work across South East England, London and Scotland.
Do you come to Newington Green?
Yes. We’re based in Crawley and work across South East England, London and Scotland.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Common problems we fix in Newington Green
Some failures date back to when the windows were fitted. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, so it comes away long before its time.
Any of these means the joints need attention:
- Water coming in at the bottom corners of a door
- Mastic that has split away from the wall
- Whistling draughts around closed windows
- White mastic on grey or black frames
For an older house near a landmark such as Newington Green Unitarian Church, the joint between an old wall and a newer frame is generally the first place rain gets in.
Comparing quotes
- Whether they seal over old material or remove it
- Whether you can choose the colour
- How the surfaces are prepared before sealing
- Whether the sealant suits the joint
Towns and villages near Newington Green
Also in Newington Green
How the visit works
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. It generally takes most of a day for a typical house, less for a few frames. For a job in Newington Green, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Before we arrive
- Tell us if parking is tricky
- Let us know about stairs, lifts or work at height
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Advice
Newington Green homes and the weather
With historic houses such as Sutton House (about 1.5 miles east) nearby, there’s older building stock in the area around Newington Green as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
Rented homes near Canonbury station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. Schools such as Newington Green Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Newington Green is about 1 mile north of Hoxton, in Greater London. Homes, rented property, offices and hotels in Newington Green is covered for window mastic. Every job comes with our 12-month guarantee. We cover 764 towns and villages across Greater London.
Here we cover the N16, N1 and N5 postcode area for window mastic. You will find streets such as Dove Road, Burma Road and Piano Lane, all of which we cover. You’ll find Newington Green on the A1199, which makes it straightforward to reach with everything needed for window mastic. Neighbouring places we cover for window mastic include Mildmay (1 mile south), Highbury (1 mile west), Canonbury (1 mile south), De Beauvoir Town (1 mile south) and Kingsland (1 mile south-east). We also work in nearby towns such as London (4 miles south), City of Westminster (4 miles south-west), Marylebone (4 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Whitechapel (3 miles south).
Landmarks near Newington Green
In Newington Green, that means homes and buildings near Stoke Newington School and Sixth Form, Highbury Fields and Army and Navy pub. There’s a railway station in Newington Green itself: Canonbury station. A little further out are Hackney Walk (1.5 miles east) and Clowns Gallery-Museum (0.7 miles south-east). Not far away are Dartmouth Park Hill and Gillespie Park.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Paint up to the joint, not over it
- Keep paint and stain on wooden frames in good order
- Don’t aim a pressure washer at the joints
- Keep solvents and bleach off the sealant
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- A door that needs adjusting, rehanging or new seals
- A failed sealed unit that has misted up
- Broken hinges, locks or handles
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- uPVC windows
- Window sills
- Aluminium frames
- Composite doors
- Patio & French doors
- Timber windows & doors