Essex · England
Sand mastic for sash & case windows in Chatham Green, Essex
Window and door surrounds in Chatham Green need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Patchy fillers round a sash window
- Wind and rain getting in round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic in Chatham Green
Sand mastic doesn’t last for ever and gaps open up round the frame. Renewing it closes the gap so the surround looks right again. If you’re dealing with open joints round the window box and crumbling sand mastic round a window, we can help, whatever the surface.
In a village or hamlet like Chatham Green, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
We stand behind the work with a one-year guarantee, so you’re covered after we’ve gone.
- Place
- Chatham Green (CM3)
- Wider area
- Essex
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Get any rot dealt with first
- Check the mastic when you check the paintwork
- Leave the new mastic unpainted
- Take care around the mastic when scraping paint
Do not touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
What happens on the day
The work is kept neat and contained to the joints we are treating. Expect the work to take a few hours for a single window, longer for several, and we tell you how long to leave it before we go. Somewhere like Chatham Green needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Move anything stored near the joints
- Tell us about any water getting in
- Let us know about stairs, lifts or work at height
Ask for a quote
Getting a quote is simple: let us know what needs doing and where. A few photos by email make the job easier to understand, and we’ll take it from there.
Read more
What happens if it’s left?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic doesn’t seal it, and the new mastic is traditionally left unpainted. In a small place like Chatham Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Why book with us
- We’re fully insured
- Anti-fungal silicone where joints get wet
- Neat joints and a tidy finish
- Homes, businesses and hotels
Common questions in Chatham Green
Do you cover smaller places like Chatham Green?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Chatham Green for sand mastic?
Yes. Our work covers London and the South East, and Chatham Green is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
When will the new mastic be hard?
A skin forms quite soon, but full hardening takes longer. We’ll tell you what to expect for your job.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can sand mastic be painted?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Is the work guaranteed?
All our work has a one-year guarantee, and we’re fully insured.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Quotes for sand mastic in Chatham Green
For a quick quote, just ask. The main things that affect it are:
- The number of rooms or windows
- Access and height
- The type of sealant required
- Whether old sealant or filler has to be cut out
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we’ll explain what it covers.
Helping us quote
To help us quote quickly, please include:
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
- The address or postcode of the job
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
Towns and villages near Chatham Green
Also in Chatham Green
Landlord and commercial work in Chatham Green
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams. Several sites can be quoted together, and we are fully insured.
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Frames and glazing around Chatham Green
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.
Rented homes near Beaulieu Park station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to Church of St John the Evangelist include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Chatham Green is about 5 miles north of Chelmsford, in Essex. Chatham Green gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Chatham Green is one of 644 towns and villages in Essex where we work.
Postcode districts we cover here for sand mastic: CM3. Close by, we work in Little Leighs (1 mile north-east), Howe Street (1 mile south-west), Hartford End (2 miles north-west), Willows Green (2 miles north) and Ford End (3 miles west). Within a short drive, we also cover Chelmsford (5 miles south), Braintree (6 miles north-east), Brentwood (15 miles south-west), Maldon (10 miles south-east), Billericay (13 miles south) and Witham (6 miles east).
Near you in Chatham Green
For rail, the closest station is Beaulieu Park station, about 4.1 miles south. Well-known places in the area include Broomfield Hospital (2.9 miles south). Green spaces nearby include Sandylay and Moat Woods.
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- Crumbling stone or brickwork round the window
- Decisions on consent for listed homes
- Timber that has rotted
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
What we seal
- Period & listed homes
- Stone surrounds
- Brick reveals
- Sash and case windows
- Tenement windows
- Timber door frames