Essex · England
Sand mastic for sash & case windows in Great Waltham, Essex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Great Waltham. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Draughts and rain around sash boxes
- Crumbling sand mastic round a window
- Weathered mastic on the most exposed windows
What happens on the day
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours per window, depending on the condition of the joints. In a small place like Great Waltham, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Clear items away from the joints we are working on
- Keep children and pets away from the work area
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Related advice
Sand mastic for homes and businesses in Great Waltham
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. If you’re dealing with cement or filler used on old window joints that has cracked and mastic dropping out of the joint, we can help, on stone surrounds, tenement windows and sash and case windows alike.
Outdoor sealant needs dry, clean surfaces, so work on frames around Great Waltham is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Great Waltham (CM3)
- Region
- Essex
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Frames and glazing around Great Waltham
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.
Schools such as Chelmer Valley High School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Beaulieu Park station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Great Waltham is about 4 miles north of Chelmsford, in Essex. We provide sand mastic to homes and businesses in Great Waltham, as part of our work across Essex. Great Waltham is one of 644 towns and villages in Essex where we work for sand mastic.
Here we cover the CM3 postcode area for sand mastic. Whether your property is on Brook Mead, Cherry Garden Road and Chelmsford Road or anywhere close by, our applicators can take on the job. Close by, we work in Breeds (1 mile south-west), Minnow End (1 mile south-east), Little Waltham (1 mile south-east), Broomfield (2 miles south-east) and Chignall Smealy (2 miles south-west). Within a short drive, we also cover Chelmsford (4 miles south), Basildon (15 miles south), Braintree (8 miles north-east), Harlow (15 miles west), Brentwood (13 miles south-west) and Maldon (11 miles south-east).
Landmarks near Great Waltham
Typical jobs here are in homes near The Beehive pub, among other places. For rail, the closest station is Beaulieu Park station, about 3.7 miles south-east. A little further out are Broomfield Hospital (1.4 miles south). The countryside around Great Waltham includes Little Waltham Meadows.
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Take care around the mastic when scraping paint
- Keep modern sealant off the mastic
- Find out about consent before window work on a listed home
- Look over the window mastic once a year
Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
We also work for property managers and facilities teams in Great Waltham and across Essex. Several sites can go on one quote, and we’re fully insured for the work.
Great Waltham questions
I let a flat near Beaulieu Park station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Is Great Waltham within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
What is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
Where do you work from?
We’re based in Crawley, and we cover South East England, London and all of Scotland.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
How we quote for sand mastic
The quote reflects the job in front of us. We take into account:
- How many areas need sealing
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
When you call or email, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- A few pictures by email, if you can
- How we’d reach the joints
- Where the job is, and your postcode
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.
Signs you need sand mastic in Great Waltham
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
Keep an eye out for these signs:
- Silicone on a period window that looks wrong
- Gaps between timber frames and stone or brick
- Old cement repairs round a window that have failed
- Draughts and rain around sash boxes
If you live in an older home near Church of SS Mary and Laurence, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before booking anyone
- When the joint can take water or movement
- Which sealant they’ll use, and why
- Whether VAT is included
- Whether you can choose the colour
Towns and villages near Great Waltham
Other services in Great Waltham
Surface by surface
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we’ll confirm access.
Honest limits
A few problems are outside what sealant work can do:
- Damaged stone surrounds
- Decayed frames that need repair
- Sashes that need overhauling
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Where we work in Great Waltham
- Sash and case windows
- Brick reveals
- Period & listed homes
- Timber door frames
- Stone surrounds
- Tenement windows