Greater London · England
South Hornchurch Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in South Hornchurch. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic that has split away from the wall
- Old mastic that has gone black or come away
- Cold air getting in at the frame edge
Window mastic in South Hornchurch
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on patio & French doors, uPVC windows and aluminium frames, and the jobs we see most are damp patches on the reveal after heavy rain and sealant in the wrong colour for the frame.
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.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Place
- South Hornchurch (RM13, RM10, RM12)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in South Hornchurch
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Landlords and letting agents in South Hornchurch can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Frames and glazing around South Hornchurch
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Rainham Hall (about 0.9 miles south) are a reminder that the area around South Hornchurch has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Managing a site like Whybridge Junior School? Then larger buildings have plenty of frames, and the mastic around each one ages. As a London address, South Hornchurch can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For landlords with property near Rainham (Essex) station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
South Hornchurch is about 3 miles south of Romford, in Greater London. From the centre of South Hornchurch to the outskirts, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, South Hornchurch among them. We also work in London, around 12 miles away.
We work across the RM13, RM10 and RM12 postcode area for window mastic and the streets around it. Local streets include Hood Road, Ford Lane and Philip Road, and we cover them all. Neighbouring places we cover for window mastic include Beam Park (1 mile south-west), Rainham (1 mile south-east), Hornchurch Marshes (1 mile south-west), Dagenham (1 mile north-west) and Elm Park (1 mile north-east). Further out, we also cover London (12 miles west), City of Westminster (15 miles west), Marylebone (14 miles west), St Pancras (13 miles west), Shoreditch (11 miles west) and Walthamstow (10 miles north-west).
Around South Hornchurch
In South Hornchurch, that means homes and buildings near The Bell pub, The Brittons Academy and Beam Valley Country Park, among other places. The nearest railway station is Rainham (Essex) station, about 0.9 miles south of the centre. Other landmarks nearby include St George's Hospital (1.9 miles north-east) and The Brewery (3.1 miles north). Green spaces nearby include Ingrebourne Marshes.
Towns and villages near South Hornchurch
What else we do in South Hornchurch
What we can’t put right
We’d rather tell you now than do work that will not last, so these are the limits:
- Damp coming through the wall itself rather than the frame joint
- A door that needs adjusting, rehanging or new seals
- Soft or decayed wood in the frame
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Timber windows & doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
- Patio & French doors
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
The process
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. It usually takes anything from an hour or two to a full day, depending on how many frames there are. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in South Hornchurch. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Before we arrive
- Mention any parking rules near the property
- Mention if the joints have been sealed before
- For business premises, tell us about site rules or sign-in
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, phone 0345 464 0079 or email us.
Related advice
Quotes for window mastic in South Hornchurch
You’ll get a clear quote before work begins. It takes into account:
- How easy the joints are to reach
- The amount of work
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Helping us quote
Photos help, but a description is a good start. Please mention:
- How we’d reach the joints
- Photos by email, if that’s easy
- The rough size of the job
- What’s wrong with the joints now
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job, and we will take it from there.
South Hornchurch: your questions answered
Do you cover South Hornchurch for window mastic?
Yes, South Hornchurch is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
I let a flat near Rainham (Essex) station. Can you help?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Are you insured?
Yes. Full insurance covers our work.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or drop us an email.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Where is Mr Mastic based?
We work from Crawley. We cover South Hornchurch and the rest of Greater London.
Can you do upstairs windows?
Yes, if safe access is possible. Higher or awkward frames may need extra access, and we will confirm what’s needed.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
What the job involves on each surface
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so they get particular care.
Composite doors
Composite doors are normally hung in an uPVC-type frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
What happens if it’s left?
If you’re painting or rendering, reseal at the same time. A clean new bead makes new paint or render look finished. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email and we’ll talk you through it.
What you get with us
- Trusted Arbo and Everbuild sealants
- Rated 4.9 stars on Google
- White, clear, grey or another colour, product permitting
- We agree the colour with you first
See what affects the cost and our reviews.