Greater London · England
Stratford Window Mastic
Window mastic in Stratford from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rain getting in at the frame or under the sill
- Mastic that’s falling out in pieces
- Gaps where the sill meets the wall
Window mastic for homes and businesses in Stratford
Around Stratford we seal all kinds of frames: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. Typical jobs include draughty joints inside around the window and rain getting in at the frame or under the sill, on composite doors, timber windows & doors and patio & French doors.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
Each job carries a 12-month guarantee, large or small.
- Where
- Stratford (E15, E20, E3)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Stratford
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. A sealant that can’t keep up eventually tears.
Keep an eye out for these signs:
- Whistling draughts around closed windows
- Gaps where the sill meets the wall
- Water coming in at the bottom corners of a door
- Gaps left after new windows were fitted
Rented homes near Stratford (London) station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
What to look for in a quote
- What product goes in the joint
- What insurance they hold
- What the cure time is
- Is the old sealant removed completely?
What we do, step by step
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before work begins. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. For a job in Stratford, 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.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Clear items away from the joints we are working on
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
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What the job involves on each surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We’ll tell you which suits your home.
Patio & French doors
Water at the foot of a door frame isn’t always the mastic: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We look for the cause first.
Can I do it myself?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Don’t paint over the silicone
- Wash the frames with mild soapy water
- Keep solvents and bleach off the sealant
- Air rooms to keep condensation down around windows
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
Look out for the warning signs: 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.
What window mastic looks like in Stratford
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 it’s worth checking before booking.
Stratford is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. In the older streets around Church of St John the Evangelist, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Stratford is about 5 miles north-east of London, in Greater London. Stratford gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Stratford is one of 764 places in Greater London we cover for window mastic.
Postcode districts we cover here for window mastic: E15, E20 and E3. You will find streets such as Gay Road, Cam Road and Eve Road, all of which we cover. Nearby, we also carry out window mastic in Maryland (1 mile east), East Village (1 mile north-west), Temple Mills (1 mile north-west), West Ham (1 mile south-east) and Hackney Wick (1 mile west). Larger places within reach include London (5 miles south-west), City of Westminster (7 miles west), Marylebone (6 miles west), Kensington (9 miles west), St Pancras (5 miles west) and Shoreditch (3 miles west).
What’s near Stratford
Locally, jobs take us to homes and businesses close to Carpenters Primary School, The Two Puddings pub and Sarah Bonnell School and the streets around them. There’s a railway station in Stratford itself: Stratford (London) station. A little further out are Stratford Centre (under half a mile south-east) and V&A East (0.5 miles west). Green spaces nearby include Hollow Pond and Old Ford Island.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Broken hinges, locks or handles
- Draughts through the window seals rather than the frame
- Damp coming through the wall itself rather than the frame joint
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before you book.
Joints and surfaces we work on
- Composite doors
- Timber windows & doors
- Window sills
- Patio & French doors
- uPVC windows
- Aluminium frames
Stratford questions
I let a flat near Stratford (London) station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Can you do window mastic in Stratford?
Yes, Stratford is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Which products 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 will explain our choice.
Can you work on commercial sites?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Is it OK to seal over old sealant?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Why it’s worth doing now in Stratford
A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. Resealing now is a small job by comparison. 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.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why Stratford clients choose us
- Fully insured
- We never seal over old sealant
- A 12-month guarantee on all work
- You choose the colour before work begins
Take a look at what affects the cost or our reviews.