Greater London · England
Hornchurch Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Hornchurch and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic worn away on windows facing the weather
- Wind and rain getting in round a sash window
- A silicone bead on a sash window that spoils the look
Quotes for sand mastic in Hornchurch
Your quote is based on your job. We look at:
- The type of sealant required
- The number and length of the joints
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
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. Call for a quick quote and we’ll go through it with you.
Helping us quote
To help us quote quickly, please include:
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- Where the job is, and your postcode
- Photos by email, if that is easy
Every job is quoted individually. Simply phone 0345 464 0079 or drop us an email and describe the job and send pictures if you have them.
About our sand mastic in Hornchurch
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant, and we will talk through which suits your home. If you have mastic that needs renewing before redecorating and crumbling sand mastic round a window, we can put it right, on period & listed homes, timber door frames and tenement windows alike.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Hornchurch as anywhere.
Every job is covered by our one-year guarantee.
- Location
- Hornchurch (RM12, RM11, RM14, RM1)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Do not paint over the new mastic
- Keep sills and gutters clear so water drains away
- Sort the mastic before the decorators arrive
- Do not run silicone over sand mastic
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
Windows and doors in Hornchurch
Historic houses like Hare Hall (about 1.8 miles north) are a reminder that the area around Hornchurch 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. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Langtons Infant School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Emerson Park station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Hornchurch is about 6 miles south-west of Brentwood, in Greater London. We carry out sand mastic for homes and businesses in Hornchurch and the surrounding area. Our Greater London coverage runs to 764 places, Hornchurch among them. We also work in London, about 14 miles from Hornchurch.
Postcode districts we cover here for sand mastic: RM12, RM11, RM14 and RM1. Streets in the area include High Street, The Avenue and Stanley Road, and we cover them all. Hornchurch sits on or near the A125, so getting to you is simple. Nearby, we also carry out sand mastic in Upminster Bridge (1 mile east), Heath Park (1 mile north-west), Emerson Park (1 mile north-east), Hacton (2 miles south) and Ardleigh Green (2 miles north). We also work in nearby towns such as London (14 miles west), St Pancras (14 miles west), Shoreditch (13 miles west), Walthamstow (10 miles west), Hoxton (13 miles west) and Whitechapel (13 miles west).
Near you in Hornchurch
Locally, jobs take us to homes and businesses close to Abbs Cross Academy and Arts College, J.J. Moon's pub and St. Andrew's Park and the streets around them. For rail, the closest station is Emerson Park station, roughly 0.7 miles north of the centre. Well-known places in the area include Upminster Tithe Barn Museum of Nostalgia (1.9 miles east) and The Brewery (1.8 miles north-west). Not far away are Hornchurch Cutting.
How it works
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours for a single window, longer for several from start to finish. In a London area like Hornchurch, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Let us know about parking restrictions
- Mention any tricky access
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Related advice
Towns and villages near Hornchurch
Also in Hornchurch
Questions from Hornchurch
Can you do sand mastic in Hornchurch?
Yes, Hornchurch 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 tell us what needs doing, and we’ll give you a clear quote.
Can parking be tricky for a visit in Hornchurch?
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.
Are you insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Should I check with the council before work on a listed or conservation-area home?
It’s best to ask your local planning authority first. Like-for-like sand mastic is often the preferred finish, but they decide.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. All the old silicone is removed first so the mastic can sit properly.
What does sand mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before any work starts.
Do you guarantee sand mastic work?
You get our 12-month guarantee to all our work.
Do you need sand mastic in Hornchurch?
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Look out for any of the following:
- Draughty sash windows at the surround
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
As a London address, Hornchurch can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- What the cure time is
- Whether all the old sealant comes out first
- How the colour is chosen
- Whether they’re fully insured
What the job involves on each surface
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Damaged stone surrounds
- Putty and glazing repairs
- Sashes that rattle, stick or will not open
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before you book.
What we seal
- Brick reveals
- Tenement windows
- Sash and case windows
- Stone surrounds
- Timber door frames
- Period & listed homes
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.