Essex · England
Sand Mastic in Great Dunmow
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Great Dunmow. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Old cement repairs round a window that have failed
- Modern sealant on a period surround
- Open joints round the window box
Landlord and commercial work in Great Dunmow
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
About our sand mastic in Great Dunmow
Traditional burnt sand mastic blends with stone and brick surrounds. It’s a good fit for period properties where a modern sealant bead would stand out. If you’re dealing with draughty sash windows at the surround and open joints round the window box, we can put it right, whatever the surface.
In a smaller place like Great Dunmow, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Great Dunmow (CM6)
- Region
- Essex
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Great Dunmow
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Homes in smaller places like Great Dunmow can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Approved under the ARBOMaster scheme
- Arbo and Everbuild products
- Fully insured
See our cost guide and customer reviews.
How it works
When we arrive, we look over the joints with you first, so you know exactly what we are doing. We protect the surfaces around the joints before any work starts. The work usually takes anything from a few hours to a full day, depending on how many windows. Parking around Great Dunmow is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Mention any parking rules near the property
- Let us know about earlier repairs to the joints
- Clear the area around the work
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or drop us an email.
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Great Dunmow questions
Do you cover Great Dunmow for sand mastic?
Yes, Great Dunmow is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear quote.
Do you work for landlords with property near Stansted Airport station?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic can sit properly.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages to suit the site.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
How long will you be here?
A typical job takes a few hours per window, depending on the condition of the joints. Your quote will say how long we expect yours to take.
Frames and glazing around Great Dunmow
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Stansted Airport station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near Parish Church of St Mary the Virgin, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Great Dunmow is about 9 miles west of Braintree, in Essex. Homes, rented property, offices and hotels in Great Dunmow can book us for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. 644 places in Essex are on our list. For nearby work, see our Chelmsford page.
Jobs for sand mastic in CM6 works the same way as everywhere else we cover. You will find streets such as Market Place, High Street and Station Road, and we cover them all. Being close to the B1008 and B1057, Great Dunmow is easy for our applicators to reach for sand mastic. We also cover the places around Great Dunmow: Church End (1 mile north-east), Little Easton (2 miles north-west), Barnston (2 miles south-east), High Roding (3 miles south-west) and Great Canfield (3 miles south-west). Larger places within reach include Chelmsford (11 miles south-east), Braintree (9 miles east), Harlow (13 miles south-west), Witham (13 miles south-east), Saffron Walden (11 miles north-west) and Halstead (13 miles east).
What’s near Great Dunmow
Around Great Dunmow, our work takes us to homes and buildings near Helena Romanes School and Sixth Form Centre and The Chequers Public House, among other places. For rail, the closest station is Stansted Airport station, about 4.3 miles west. Other landmarks nearby include Little Easton Moat (1.6 miles north-west).
What we are called out for in Great Dunmow
Water gets into small cracks in the mastic and loosens it further. Windows facing the weather tend to go first.
Any of these means the joints need attention:
- Draughty sash windows at the surround
- Gaps where the frame meets the masonry
- Mastic that needs renewing before redecorating
- Old sand mastic that has cracked, crumbled or fallen out
Schools such as Dunmow St Mary's Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- What the cure time is
- What guarantee comes with the work
- Whether you can choose the colour
- Who turns up on the day
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep modern sealant off the mastic
- Don’t paint over the new mastic
- Ask the planning authority about consent for listed or conservation-area homes
- Get any rot dealt with first
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at before trying a quick fix.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How the job changes by surface
Period and listed homes
A traditional finish suits a period property.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.