Greater London · England
Window Mastic in Hornchurch Marshes
Our applicators work in Hornchurch Marshes on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Cracked sealant at the sill ends
- Cold air getting in at the frame edge
- Draughty joints inside around the window
Window mastic in Hornchurch Marshes, done properly
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. If you have cracked or shrunken mastic around the frame and damp patches on the reveal after heavy rain, we can help, on window sills, aluminium frames and composite doors alike.
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.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Location
- Hornchurch Marshes (RM13, RM9, RM10)
- Region
- Greater London
- Cover
- One year on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in Hornchurch Marshes
Choosing the product is half the job. Decorators’ caulk and bathroom silicone are not designed for outside joints that move. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Hornchurch Marshes.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why us?
- You choose the colour before work begins
- Anti-fungal sanitary silicone in wet areas
- White, clear, grey or coloured to suit, where the product allows
- ARBOMaster approved applicator
Read our cost guide or what customers say.
Questions from Hornchurch Marshes
Is parking an issue for window mastic in Hornchurch Marshes?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Is Hornchurch Marshes in your area for window mastic?
Yes, Hornchurch Marshes is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll send you a clear quote.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we’re fully insured.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
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’ll explain our choice.
What window mastic looks like in Hornchurch Marshes
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Historic houses like Rainham Hall (about 1.1 miles east) are a reminder that the area around Hornchurch Marshes has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Brook Sixth Form and Academy are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Church of St Helen and St Giles, the joint between an old wall and a newer frame is generally the first place rain gets in.
Hornchurch Marshes is about 2 miles south of Dagenham, in Greater London. From the centre of Hornchurch Marshes to the outskirts, we cover window mastic for every kind of property. Our area takes in 764 places across Greater London. For nearby work, see our London page (11 miles or so).
Our applicators cover all of RM13, RM9 and RM10 for window mastic. If you need window mastic at a property on Frog Lane, Consul Avenue and Fairlane Road or anywhere close by, our applicators can take on the job. Nearby, we also carry out window mastic in Beam Park (1 mile north-east), Dagenham Green (1 mile north-west), Dagenham Dock (1 mile west), South Hornchurch (1 mile north-east) and Rainham (1 mile east). 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 north-west).
Landmarks near Hornchurch Marshes
Around Hornchurch Marshes, our work takes us to homes and buildings near Beam Primary School and Wildspace Conservation Park and the streets around them. The closest station to Hornchurch Marshes is Dagenham Dock station, roughly 1 mile north-west of the centre. Other landmarks nearby include Erith Museum (2.6 miles south) and Erith and District Hospital (2.8 miles south). Not far away are Crossness Nature Reserve.
When to call us in Hornchurch Marshes
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and timber moves with moisture as well as temperature.
Most people get in touch when they notice one of these:
- Mastic that is falling out in pieces
- Cracked internal joints between frame and plaster
- Draughts coming in around windows and doors
- Mastic that has split away from the wall
As a London address, Hornchurch Marshes can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- How long the guarantee is
- How hidden problems are handled
- Whether VAT is included
- How much experience the applicator has
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
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.
How the job changes by surface
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. They’re cut out and resealed with exterior sealant.
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it without cracking.
Places near Hornchurch Marshes
What else we do in Hornchurch Marshes
How it works
Good joint work is mostly preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes anything from an hour or two to a full day, depending on how many frames there are. For a job in Hornchurch Marshes, 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 how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Clear items away from the joints we are working on
- Keep children and pets away from the work area
How to get a quote
We don’t publish a price list, because every job is different. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or drop us an email.
Related advice
Landlord and commercial work in Hornchurch Marshes
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
For anyone letting property in or around Hornchurch Marshes, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and photos by email help.
Looking after it afterwards
To keep the joints looking good and working properly:
- Ventilate rooms so frames do not stay wet inside
- Keep paint and stain on wooden frames in good order
- Check the mastic once a year
- Clean frames with a soft cloth and soapy water
Keep the new mastic undisturbed while it cures, following the cure time we give you. Keep jet washers away from the frames.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.