Greater London · England
New Build Mastic in South Hornchurch
Our applicators work in South Hornchurch on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Skirting joints opening in the first winter
- Gaps opening as the house dries out and settles
- Untidy sealant flagged on a snagging list
New build mastic in South Hornchurch, done properly
We never seal over a failed new-build bead. New silicone won’t bond to old silicone, so it all comes out before we clean, dry and reseal. Common call-outs are for messy sealant that spoils new finishes and plot mastic for developers ahead of handover, on bathrooms & en suites, plot handovers and show homes.
Much of London’s new housing is flats in larger developments. Snagging there often goes through the developer or managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Where
- South Hornchurch (RM13, RM10, RM12)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
New build mastic in South Hornchurch: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
South Hornchurch is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
South Hornchurch is about 3 miles south of Romford, in Greater London. For new build mastic in and around South Hornchurch, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base, South Hornchurch included. South Hornchurch is one of 764 towns and villages in Greater London we cover for new build mastic. London is on our list too, around 12 miles away.
Work in RM13, RM10 and RM12 is quoted and booked the same way as anywhere else. Whether your property is on Hood Road, Ford Lane and Philip Road or a nearby road, our applicators can take on the job. If you are just outside South Hornchurch, we cover 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). Within a short drive, 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).
Near you in South Hornchurch
In South Hornchurch, that means homes and buildings near The Bell pub, The Brittons Academy and Beam Valley Country Park and the streets around them. South Hornchurch’s nearest station is Rainham (Essex) station, about 0.9 miles south. Nearby you will also find St George's Hospital (1.9 miles north-east) and The Brewery (3.1 miles north). Not far away are Ingrebourne Marshes.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Use the extractor fan every time you shower
- Avoid running a DIY bead over the old one
- Avoid scourers and strong chemicals on sealant
- Watch for new gaps as the house dries out
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents, which can damage the surface.
A seal that splits early is often a sign of movement. Getting it resealed properly, and any movement checked, stops it recurring.
When something else is needed
It helps to know what we cannot do:
- Settlement cracks that need a surveyor
- Damaged fittings that need replacing
- Baths and trays that move too much for sealant to cope with
If you’re not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer.
What we seal
- Plot handovers
- Show homes
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
How it works
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. Most jobs take anything from a few hours to several days, depending on the number of plots. In a London area like South Hornchurch, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We go through the snagging list or plot schedule and agree the joints to do.
- Failed or untidy sealant is cut out completely.
- Each joint is cleaned of dust and grit, then primed if required.
- A sealant chosen for each area goes in and is tooled smooth.
- We check every joint and tell you how long each needs to cure.
Getting ready for the visit
- Clear items away from the joints we are working on
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
Get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job.
Related advice
Surface by surface
Skirting and floors
Where the floor meets a bath panel or kitchen plinth, the joint keeps mop water out. We seal them with a sealant suited to wet areas.
Windows and doors
Draughts around new frames are often a sealant gap. We check and reseal the frame edges.
Also near South Hornchurch
Other services in South Hornchurch
Questions from South Hornchurch
Is parking a problem for a job in South Hornchurch?
Parking in South Hornchurch, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you cover South Hornchurch for new build mastic?
Yes. Our work covers London and the South East, and South Hornchurch is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
How long does new build mastic take?
A typical job takes a few hours in a single home, including the preparation. Your quote will say how long we expect yours to take.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
Where are you based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Can I send you my snagging list?
Yes. Snagging lists are a common starting point for us. We agree the sealant items with you before any work starts.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Leave it or put it right?
Water getting past a failed seal in a new build reaches walls and floors that are still settling. Resealing promptly protects the new finishes around it. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Why choose Mr Mastic in South Hornchurch
- More than 20 years in sealant work
- Sealant colour chosen to suit
- Rated 4.9 stars on Google
- Anti-fungal sanitary silicone in wet areas
Take a look at how sealant jobs are priced or our reviews.
What we are called out for in South Hornchurch
New homes are full of moisture from plaster, screed and concrete, and it dries out over the first couple of years. Drying timber shrinks and pulls joints apart and the sealant has to cope with the movement.
The problems people usually mention when they call are:
- Sealant work across a run of new homes
- Joints pulling apart as timber shrinks
- Messy sealant that spoils new finishes
- Kitchen sealant that has pulled off the wall
If you’ve bought a new home near Rainham (Essex) station, the sealant around baths, showers and frames is worth checking in the first year or two.
Before booking anyone
- How much experience the applicator has
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
- Whether all the old sealant comes out first