Greater London · England
Window & door mastic in Dagenham, Greater London
Window mastic in Dagenham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps left after new windows were fitted
- Mastic that has split away from the wall
- Water coming in at the bottom corners of a door
What happens on the day
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and tidy away. It generally takes a few hours for a handful of frames, longer for a whole house. In Dagenham, flats, stairs and shared entrances are part of the routine. 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.
How to prepare
- Let us know if you’ve seen damp or leaks
- Clear items away from the joints we’re working on
- Let us know about parking restrictions
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
Advice
Window mastic for homes and businesses in Dagenham
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 work on timber windows & doors, composite doors and aluminium frames, and common reasons people get in touch are untidy mastic left by window fitters and cold air getting in at the frame edge.
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 Dagenham as anywhere.
All our work comes with a 12-month guarantee.
- Location
- Dagenham (RM10, RM9, RM13, RM7)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Damp coming through the wall itself rather than the frame joint
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Faulty window hardware
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Window sills
- Timber windows & doors
- uPVC windows
- Composite doors
- Aluminium frames
- Patio & French doors
Dagenham homes and the weather
Historic houses like Rainham Hall (about 2 miles south-east) are a reminder that the area around Dagenham 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. 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.
As a London address, Dagenham can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Managing a site like Village Infants' School? Then its window and door frames need their mastic kept sound, just like a home’s.
Dagenham is about 3 miles south of Romford, in Greater London. Across the RM10 area, our applicators can take on window mastic. We cover 764 towns and villages across Greater London, large and small. We also work in London, about 11 miles from Dagenham.
We cover every part of RM10, RM9, RM13 and RM7 for window mastic. Whether your property is on Exeter Road, Plumtree Close and Rodwell Place or a nearby road, we can help. With the B178 close by, Dagenham is simple for us to get to for window mastic. Neighbouring places we cover for window mastic include Becontree (1 mile north-west), Dagenham Green (1 mile south-west), Beam Park (1 mile south), South Hornchurch (1 mile south-east) and Hornchurch Marshes (2 miles south). We also work in nearby towns such as London (11 miles west), City of Westminster (14 miles west), Marylebone (13 miles west), St Pancras (12 miles west), Shoreditch (10 miles west) and Walthamstow (9 miles west).
What’s near Dagenham
We work in homes and buildings around Dagenham Park Community School, Beam Valley Country Park and Cross Keys pub. The closest station to Dagenham is Dagenham Dock station, roughly 1.2 miles south-west. Nearby you will also find Rush Green Hospital (1.5 miles north-east) and The Brewery (2.5 miles north). The countryside around Dagenham includes Dagenham Village Churchyard.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Repaint timber before it’s bare
- Use gentle cleaners on frames and sealant
- Make sure the drainage slots are not blocked
- Air rooms to keep condensation down around windows
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Signs to watch for: 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 affects the cost of window mastic
Your quote is based on your job. We look at:
- Access and height
- How many areas need sealing
- How much there is to do
- The type of sealant required
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
To help us quote quickly, please include:
- Whether it has been sealed before
- Where the job is, and your postcode
- What’s wrong with the joints now
- Any access issues, like height or stairs
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.
Surface by surface
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that without cracking.
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We’ll point out any rot we find, as that’s a job for a joiner.
Common questions in Dagenham
Do you work for landlords with property near Dagenham Dock station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Can parking be tricky for a visit in Dagenham?
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.
What do you need from me for a quote?
A short description and the location. We’ll ask anything else we need to know.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Can you do the inside joint as well?
Yes. Inside, the joint between frame and plaster is sealed neatly.
Can you get sealant to suit coloured frames?
Yes, in most cases. Tell us the frame colour when you get in touch and we will use the nearest match.
Do the sealants smell?
There can be a smell while the sealant cures. Ventilation helps.
Places near Dagenham
Also in Dagenham
Do you need window mastic in Dagenham?
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar never bonded as it should, and it lets go sooner than it should.
These are the problems we are asked about most:
- Cracked internal joints between frame and plaster
- Leaking joints at the ends of sills
- Black, perished sealant on frames
- Cold air getting in at the frame edge
For an older house near a landmark such as St. Peter and St. Paul, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- How the joint is cleaned and prepared
- What guarantee comes with the work
- What product goes in the joint
- When the joint can take water or movement