Greater London · England
Window Mastic in De Beauvoir Town
Mastic around window and door frames, sills and patio doors in De Beauvoir Town, with a 12-month guarantee on every job. Call for a quick quote.
- Cracked sealant at the sill ends
- Draughty joints inside around the window
- Draughts coming in around windows and doors
Window mastic in De Beauvoir Town
Most frames have an outside joint and an inside one. The external joint is the weather seal; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. We are often asked to deal with leaking joints at the ends of sills and draughty joints inside around the window, across timber windows & doors, composite doors and uPVC windows.
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, letting in draughts and water.
A one-year guarantee comes as standard.
- Place
- De Beauvoir Town (N1, E8, N16)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we’re called out for in De Beauvoir Town
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, and a gap filled solid cannot flex. That’s what backing rod is for.
Keep an eye out for any of the following:
- Rain getting in at the frame or under the sill
- Leaking joints at the ends of sills
- Whistling draughts around closed windows
- Black, perished sealant on frames
As a London address, De Beauvoir Town can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- The length of the guarantee
- Whether all the old sealant comes out first
- How hidden problems are handled
- How the colour is chosen
Questions from De Beauvoir Town
Is parking a problem for a job in De Beauvoir Town?
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 Dalston Junction station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Can resealing stop a draught around my window?
Often, yes. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
How long will my window job take?
The work takes a few hours for a handful of frames, longer for a whole house. Access and how stubborn the old mastic is affect the time most.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
When it is not the sealant
We will not take on work that will not last, so here’s what sealant cannot put right:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp coming through the wall itself rather than the frame joint
- A frame that has rotted at the joint
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Where we work in De Beauvoir Town
- Aluminium frames
- Patio & French doors
- Timber windows & doors
- uPVC windows
- Window sills
- Composite doors
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Use gentle cleaners on frames and sealant
- Avoid blasting the frames with a pressure washer
- Clear any debris from frame drain holes
- Air rooms to keep condensation down around windows
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Landlords, agents and businesses in De Beauvoir Town
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Why it’s worth doing now in De Beauvoir Town
A quick bead over the top of old mastic looks like an easy fix, but new sealant can’t bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. The old mastic has to come out. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in De Beauvoir Town, the repair is bigger than the sealant job would have been.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Why De Beauvoir Town customers choose us
- We agree the colour with you first
- A sealant colour to suit the surroundings
- Old sealant always removed completely
- Domestic, commercial and hotel work
Read what affects the cost and what customers say.
What affects the quote in De Beauvoir Town
You’ll get a clear quote before work begins. It’s based on:
- Whether old sealant or filler has to be cut out
- Access and height
- When we can work, for business premises
- The product the joint needs
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
What we need to know
Photos by email are helpful but not essential. Please mention:
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- The rough size of the job
- Pictures of the joints, sent by email
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
How it works
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from an hour or two to a full day, depending on how many frames there are, depending on how much there is to do. In De Beauvoir Town, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Before we arrive
- Clear items away from the joints we are working on
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved before giving you a price.
Read more
Frames and glazing around De Beauvoir Town
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
Schools such as Our Lady and St Joseph Catholic Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Dalston Junction station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
De Beauvoir Town is about 1 mile north of Hoxton, in Greater London. De Beauvoir Town gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. De Beauvoir Town is one of 764 places in Greater London where we work.
Our applicators cover all of the N1, E8 and N16 postcode area for window mastic. Whether your property is on Dove Road, Essex Road and Clare Lane or anywhere close by, we can help. If you’re just outside De Beauvoir Town, we cover Kingsland (1 mile north-east), Canonbury (1 mile west), Mildmay (1 mile north), Dalston (1 mile east) and Newington Green (1 mile north). We also work in nearby towns such as London (3 miles south), City of Westminster (4 miles south-west), Marylebone (3 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Hampstead (4 miles west).
Local landmarks in De Beauvoir Town
Around De Beauvoir Town, our work takes us to homes and buildings near Hackney New School, Bishopsgate Institute Special Collections and Archives and Kingsland Secondary School, among other places. You’ll also find The Prince of Wales pub (within half a mile east) and Shoreditch Park (0.7 miles south-west). De Beauvoir Town has its own railway station: Dalston Junction station. Nearby you will also find Clowns Gallery-Museum (within half a mile east) and Montfichet's Tower (2.3 miles south-west). Not far away are St. James's Park Lake and Ludgate Hill.