Essex · England
Sand mastic for sash & case windows in Downham, Essex
Professional sand mastic in and around Downham, with every bit of old sealant taken out first and a 12-month guarantee.
- Mastic that needs renewing before redecorating
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Inspect the joints round the windows every year or so
- Find out about consent before window work on a listed home
- Renew mastic before redecorating the windows
- Take care around the mastic when scraping paint
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
About our sand mastic in Downham
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties, where modern sealant can look out of place. We work on stone surrounds, brick reveals and tenement windows, and common reasons people get in touch are open joints round the window box and weathered mastic on the most exposed windows.
Outdoor sealant needs dry, clean surfaces, so work on frames around Downham is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Downham (CM11)
- Wider area
- Essex
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. On listed buildings, check with your planning authority first.
What happens on the day
We keep the work tidy and contained to the area we’re working on. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we explain the cure time before we leave. In a small place like Downham, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
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 send us an email.
Related advice
Downham homes and the weather
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Ingatestone Hall (about 4.7 miles west) nearby, there’s older building stock in the area around Downham as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as The Bromfords School and Sixth Form College, its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Wickford station, older sash windows in a rental need their mastic kept sound to keep the weather out. If you live in an older home near Church of St Margaret, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Downham is about 3 miles north-west of Wickford, in Essex. Our applicators cover sand mastic for homeowners, landlords and businesses in Downham. 644 places in Essex are on our list, from the larger towns to small villages. For nearby work, see our Chelmsford page (7 miles or so).
All of CM11 is covered for sand mastic, from the main roads to the quietest streets. We cover properties on School Road, Crowsheath Lane and Sudbury Road and the roads around them. We also cover the places around Downham: Ramsden Heath (1 mile west), Ramsden Bellhouse (1 mile south), Crays Hill (3 miles south), Stock (3 miles north-west) and Billericay (3 miles west). Within a short drive, we also cover Chelmsford (7 miles north), Basildon (5 miles south), Brentwood (8 miles west), Maldon (10 miles north-east), Canvey Island (9 miles south-east) and Rayleigh (6 miles south-east).
Landmarks near Downham
Typical jobs here are in homes near The White Horse Public House, among other places. Downham’s nearest station is Wickford station, roughly 1.9 miles south-east of the centre. Other landmarks nearby include Barleylands Farm Museum (3.2 miles south-west) and Mayflower Community Hospital (3.9 miles west). For a walk, there’s Crowsheath Wood.
Towns and villages near Downham
More services for Downham
Landlords, agents and businesses in Downham
We also work for property managers and facilities teams. We can quote a run of properties together.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Your questions about sand mastic in Downham
Can you do sand mastic in Downham?
Yes, Downham is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near Wickford station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like but the decision is theirs.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
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.
Honest limits
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Damaged stone surrounds
- Sashes that need overhauling
- Decayed frames that need repair
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Brick reveals
- Sash and case windows
- Period & listed homes
- Tenement windows
- Timber door frames
- Stone surrounds
Why act early in Downham
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. Where a wall is exposed, as many are in small places like Downham, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Downham
- A 12-month guarantee on all work
- Neat joints and a tidy finish
- Rated 4.9 stars on Google
- Arbo and Everbuild products
Read what affects the cost or customer reviews.