Essex · England
Sand mastic for sash & case windows in Dedham, Essex
Sand mastic in Dedham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old cement repairs round a window that have failed
- Mastic round period door frames that has failed
- Failed mastic on an exposed elevation
About our sand mastic in Dedham
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. We work on tenement windows, period & listed homes and timber door frames, and people most often call us about old cement repairs round a window that have failed and modern sealant on a period surround.
Mastic can only go onto a dry, clean joint, so window work in Dedham is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or email us.
- Location
- Dedham (CO7)
- Wider area
- Essex
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Dedham: your questions answered
Do you work for landlords with property near Manningtree station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Do you cover Dedham for sand mastic?
Yes. We work across London and the South East, and Dedham is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How much does sand mastic cost in Dedham?
Every job is different, so each one gets its own quote. For a quick quote, ring 0345 464 0079 or email us and let us know what needs doing and where.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
What sealant work cannot fix
We will always be straight with you, so here’s what new sealant will not do:
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
- Decisions on consent for listed homes
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Surfaces we seal
- Tenement windows
- Brick reveals
- Sash and case windows
- Period & listed homes
- Timber door frames
- Stone surrounds
What we do, step by step
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several, including the tidy-up. Somewhere as small as Dedham, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job, and we’ll take it from there.
Advice
Nearby places to Dedham
More services for Dedham
For landlords and businesses
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
Frames and glazing around Dedham
The South East is one of the drier parts 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 Castle House (about 0.5 miles south-east) nearby, there’s older building stock in the area around Dedham as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Managing a site like Dedham Church of England Voluntary Controlled Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Manningtree station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. In the older streets around Parish Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Dedham is about 6 miles north-east of Colchester, in Essex. For sand mastic in and around Dedham, it’s easy to get a quote: please call 0345 464 0079 or email us. We are based in Crawley and cover Essex, Dedham included. Our Essex coverage runs to 644 places, and Dedham is one of them. We also work in Chelmsford, about 26 miles from Dedham.
Postcode districts we cover here for sand mastic: CO7. Whether your property is on High Street, School Lane and The Drift or anywhere close by, our applicators can take on the job. Close by, we work in Lamb Corner (1 mile south-west), Dedham Heath (1 mile south), Stratford St Mary (1 mile north-west), Ardleigh Heath (2 miles south) and Higham (2 miles north-west). We also work in nearby towns such as Colchester (6 miles south-west), Clacton-on-Sea (13 miles south-east), Harwich (12 miles east), Camulodunum (7 miles south-west), Halstead (15 miles west) and Greenstead (5 miles south-west).
Around Dedham
Locally, jobs take us to homes and businesses close to The Sun Inn and East Bergholt High School, among other places. For rail, the closest station is Manningtree station, about 2.4 miles east. Nearby you will also find Severalls Hospital (4.9 miles south-west) and Little Wenham Castle (4.1 miles north-east). For a walk, there’s Cattawade Marshes.
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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.
Aftercare tips
After the cure time, these simple habits help:
- Renew mastic before redecorating the windows
- Check the mastic when you check the paintwork
- Take care around the mastic when scraping paint
- Ask a joiner to look at soft timber first
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
How the job changes by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Why act early in Dedham
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. Older cottages and farmhouses around Dedham can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- We’re fully insured
- We leave the area clean and tidy
- Approved under the ARBOMaster scheme
- Experience in homes, commercial sites and hotels
Take a look at our cost guide or customer reviews.