Essex · England
Sand mastic for sash & case windows in Harrowcross, Essex
Problem with your window and door surrounds in Harrowcross? We remove the old material, prepare the joints and seal them properly.
- Tired mastic found when preparing windows for paint
- Silicone on a period window that looks wrong
- Draughts and rain around sash boxes
What happens on the day
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. It normally takes a few hours for a single window, longer for several. Somewhere as small as Harrowcross, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Clear the area around the work
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
How to get a quote
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand.
Read more
About our sand mastic in Harrowcross
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant, and we will talk through which suits your home. We work on brick reveals, stone surrounds and sash and case windows, and people most often call us about weathered mastic on the most exposed windows and wind and rain getting in round a sash window.
Homes in small places like Harrowcross often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Harrowcross (CO9)
- Region
- Essex
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
After the cure time, these simple habits help:
- Get any rot dealt with first
- Clear gutters so water doesn’t pour onto the windows
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
Do not touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Can I do it myself?
If you’re 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.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Sand mastic in Harrowcross: local notes
Historic houses like Hedingham Castle (about 1.7 miles north-east) are a reminder that the area around Harrowcross has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St Peter include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Harrowcross is about 3 miles north-west of Halstead, in Essex. We carry out sand mastic for householders, landlords and businesses in Harrowcross. Harrowcross is one of 644 places in Essex we cover. We also work in Chelmsford, around 17 miles away.
Here we cover the CO9 postcode area for sand mastic. If you’re just outside Harrowcross, we cover Sible Hedingham (1 mile north-east), Almshouse Green (1 mile west), Castle Hedingham (2 miles north-east), Gosfield (3 miles south) and Beazley End (4 miles south-west). Larger places within reach include Colchester (15 miles east), Braintree (6 miles south), Witham (12 miles south), Saffron Walden (15 miles west), Camulodunum (14 miles south-east) and Halstead (3 miles south-east).
What’s near Harrowcross
Around Harrowcross, our work takes us to homes and buildings near The White Lion pub and the streets around them. A little further out are Hedingham Castle (1.7 miles north-east) and Halstead Hospital (3 miles south-east). The countryside around Harrowcross includes Belcher's and Broadfield Woods.
For landlords and businesses
Landlords and letting agents in Harrowcross can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Do you need sand mastic in Harrowcross?
Most of it is simply age. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
It’s worth asking for a quote if you see:
- Tired mastic found when preparing windows for paint
- Gaps round a timber door in stone or brick
- Open joints round the window box
- Mastic worn away on windows facing the weather
Managing a site like Hedingham School and Sixth Form? Then its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- What preparation is included
- How the colour is chosen
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Masonry that needs repairing
- Cracked or broken glass
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Period & listed homes
- Sash and case windows
- Brick reveals
- Timber door frames
- Stone surrounds
- Tenement windows
How we quote for sand mastic
There’s no set price list. The quote depends on:
- When we can work, for business premises
- Whether the work is at height
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What we need to know
What to tell us when you ask for a quote:
- If someone has resealed it before
- How many joints, rooms or windows are involved
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Nearby places to Harrowcross
Other services in Harrowcross
Questions from Harrowcross
Is sand mastic in Harrowcross guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Do you cover smaller places like Harrowcross?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is consent needed for window work on a listed home?
Checking first is sensible. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
How long will you be here?
That depends on how much there is to do, but as a guide it takes anything from a few hours to a full day, depending on how many windows. We’ll give you a better idea when we quote.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.