Greater London · England
Window & door mastic in Rainham, Greater London
Our applicators work in Rainham on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Water coming in at the bottom corners of a door
- Untidy mastic left by window fitters
- Cracked or shrunken mastic around the frame
Why it’s worth doing now in Rainham
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Rainham, the repair is bigger than the sealant job would have been.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- One-year guarantee on every job
- Homes, businesses and hotels
- You choose the colour before work begins
- Colour picked to suit the job
Window mastic in Rainham
There are two joints on most windows. 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 patio & French doors, window sills and aluminium frames, and people most often call us about cracked sealant at the sill ends and mastic that’s falling out in pieces.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Rainham is something to talk through when you book.
You get a one-year guarantee, the same in Rainham as everywhere else we work.
- Place
- Rainham (RM13)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Landlords and agents in Rainham can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
What happens on the day
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. The work usually takes a morning for a couple of windows and a door. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
Before we arrive
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
How to get a quote
If you are in Rainham and need window mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Related advice
Windows and doors in Rainham
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
Letting a property close to Rainham (Essex) station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Managing a site like Rainham Village Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Homes close to Church of St Helen and St Giles include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Rainham is about 4 miles south of Romford, in Greater London. Every kind of property in Rainham is covered for window mastic. Every job comes with our one-year guarantee. Our Greater London coverage runs to 764 places, Rainham among them. We also work in London, about 13 miles from Rainham.
Our applicators cover all of RM13 for window mastic and the streets around it. Local streets include New Road, Ferry Lane and Wantz Lane, and we cover them all. If you are just outside Rainham, we cover South Hornchurch (1 mile north-west), Beam Park (1 mile west), Hornchurch Marshes (1 mile west), Dagenham Green (2 miles west) and Elm Park (2 miles north). Further out, we also cover London (13 miles west), City of Westminster (15 miles west), Marylebone (15 miles west), St Pancras (13 miles west), Shoreditch (12 miles west) and Walthamstow (11 miles north-west).
What’s near Rainham
In Rainham, that means homes and buildings near Harris Academy Rainham, The Chafford School and The Phoenix pub. There’s a railway station in Rainham itself: Rainham (Essex) station. Other landmarks nearby include St George's Hospital (2.3 miles north-east) and Erith Museum (2.6 miles south). Not far away are Ingrebourne Marshes.
Quotes for window mastic in Rainham
Every job gets its own quote. This is what makes a difference:
- The number of rooms or windows
- Any mould that needs treating
- Access and height
- The number and length of the joints
Leaving a failed joint normally makes the job bigger, not smaller. If you’re unsure, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Asking for a quote
To help us quote quickly, let us know:
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- Photos by email, if that’s easy
- The type of property
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
More services for Rainham
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Clear any debris from frame drain holes
- Check the mastic once a year
- Paint up to the joint, not over it
- Ventilate rooms so frames don’t stay wet inside
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
FAQs for Rainham
Do you work for landlords with property near Rainham (Essex) station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Is Rainham in your area for window mastic?
Yes, Rainham is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Where is Mr Mastic based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
How much does window mastic cost in Rainham?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or email us with a short description of the job.
Honest limits
It helps to know what we cannot do:
- Faulty window hardware
- Condensation trapped between the panes
- Soft or decayed wood in the frame
If you’re not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
What we seal
- Patio & French doors
- Aluminium frames
- uPVC windows
- Window sills
- Composite doors
- Timber windows & doors
Surface by surface
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that, where a rigid one would crack.
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.