Greater London · England
Dalston Window Mastic
Specialist window mastic for Dalston: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Black, perished sealant on frames
- Rushed sealant from a window installation
- Damp patches on the reveal after heavy rain
Window mastic for homes and businesses in Dalston
From a single sill to a whole house of windows, the work is priced before anything is done. Just ring 0345 464 0079 or email us and tell us how many frames there are and how they’re reached. We work on aluminium frames, composite doors and patio & French doors, and the jobs we see most are rain getting in at the frame or under the sill and gaps where the sill meets the wall.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Dalston as anywhere.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Where
- Dalston (E8, N1, N16)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Dalston
I let a flat near Dalston Junction station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Is parking an issue for window mastic in Dalston?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Do you have sealant for grey or black windows?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Does the work come with a guarantee?
Yes. Our one-year guarantee covers every job.
Should I try DIY first?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
The process
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours for a handful of frames, longer for a whole house. 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.
- The old mastic is cut out and scraped back to clean surfaces.
- 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.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
How to get a quote
For window mastic in Dalston, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
Landlord and commercial work in Dalston
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Faulty window hardware
- Rotten timber, which needs a joiner first
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Timber windows & doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
- Patio & French doors
Windows and doors in Dalston
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Sutton House (about 0.9 miles east) are a reminder that the area around Dalston has older buildings as well as new. 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.
Letting a property close to Dalston Junction 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 Holy Trinity Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Dalston is about 1 mile north-east of Hoxton, in Greater London. For window mastic in and around Dalston, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We’re based in Crawley and cover Greater London, Dalston included. Dalston is one of 764 towns and villages in Greater London where we work.
All of E8, N1 and N16 is within our area for window mastic, from the main roads to the quietest streets. If you need window mastic at a property on Glebe Road, Forest Road and Boleyn Road or anywhere close by, we can help. Main roads around Dalston include the A107 and A1207. We also cover the places around Dalston: Kingsland (1 mile west), De Beauvoir Town (1 mile west), Hackney Central (1 mile east), London Fields (1 mile south-east) and Shacklewell (1 mile north). We also work in nearby towns such as London (3 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 Hampstead (5 miles west).
Local landmarks in Dalston
We work in homes and buildings around Kingsland Secondary School, The Petchey Academy and The Duke Of Richmond Public House, among other places. Nearby too are Haggerston Park (0.8 miles south) and Bishopsgate Institute Special Collections and Archives (1.9 miles south). Dalston has its own railway station: Dalston Junction station. Other landmarks nearby include Clowns Gallery-Museum (within half a mile west) and Montfichet's Tower (2.6 miles south-west). For a walk, there’s Gillespie Park and Ludgate Hill.
Keeping the joints in good condition
So the new joints stay in good condition:
- Paint up to the joint, not over it
- Keep jet washers away from the mastic
- Keep paint and stain on wooden frames in good order
- Make sure the drainage slots are not blocked
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Different surfaces, different methods
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour suits the frame.
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. Each is cleaned out and resealed.
What we are called out for in Dalston
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, and it lets go sooner than it should.
Look out for any of the following:
- Black, perished sealant on frames
- Mastic that has split away from the wall
- Rain getting in at the frame or under the sill
- Gaps left after new windows were fitted
As a London address, Dalston can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- How the surfaces are prepared before sealing
- How the colour is chosen
- Whether all the old sealant comes out first
- How long the guarantee is
What else we do in Dalston
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you do try it yourself, take your time over the 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.