Essex · England
Sand Mastic in High Ongar
Professional sand mastic in and around High Ongar, with old sealant always removed completely and a 12-month guarantee.
- Gaps where the frame meets the masonry
- A silicone bead on a sash window that spoils the look
- Mastic that needs renewing before redecorating
How we handle sand mastic in High Ongar
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. If you’re dealing with tired mastic found when preparing windows for paint and failed mastic on an exposed elevation, we can put it right, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around High Ongar is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
All of our work is guaranteed for twelve months, in High Ongar and everywhere else we cover.
- Where
- High Ongar (CM5)
- Region
- Essex
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in High Ongar
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
High Ongar questions
Is sand mastic in High Ongar guaranteed?
All our work, in High Ongar and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Can you do sand mastic in High Ongar?
Yes, High Ongar is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Do you work for landlords and businesses?
Yes. We work for householders, landlords, letting agents, businesses and hotels in High Ongar.
Can old silicone round a sash window be swapped for sand mastic?
Generally, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Are you fully insured?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Do I need to be at home?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
High Ongar homes and the weather
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Church of St Mary the Virgin, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as High Ongar Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
High Ongar is about 6 miles north of Brentwood, in Essex. Homes, rented property, offices and hotels in High Ongar can book us for sand mastic. The work is guaranteed for a year. 644 places in Essex are on our list, from the larger towns to small villages. There’s also a page for Chelmsford, about 10 miles away.
Postcode districts we cover here for sand mastic: CM5. You’ll find streets such as The Street, Mill Lane and Millfield, all of which we cover. If you are just outside High Ongar, we cover Chipping Ongar (1 mile west), Shelley (1 mile north-west), Norton Mandeville (1 mile north-east), King Street (1 mile east) and Greensted (2 miles west). Within a short drive, we also cover Chelmsford (10 miles east), Basildon (12 miles south-east), Harlow (8 miles north-west), Brentwood (6 miles south), Billericay (9 miles south-east) and Loughton (9 miles south-west).
Near you in High Ongar
Locally, jobs take us to homes and businesses close to Red Lion Public House and The Ongar Academy and the streets around them. Other landmarks nearby include Willingale Doe (3.7 miles north-east).
Towns and villages near High Ongar
Also in High Ongar
Quotes for sand mastic in High Ongar
Your quote is based on your job. We take into account:
- Whether old sealant or filler has to be cut out
- The number and length of the joints
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- Photos by email, if that’s easy
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
What happens on the day
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. Somewhere like High Ongar needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Mention if the joints have been sealed before
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved and give you a clear price.
Read more
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
When something else is needed
We’ll always be straight with you, so here’s what sealant cannot fix:
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
- Cracked or broken glass
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly.
What we seal
- Brick reveals
- Stone surrounds
- Sash and case windows
- Timber door frames
- Tenement windows
- Period & listed homes
Aftercare tips
After the cure time, these simple habits help:
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
- Keep sills and gutters clear so water drains away
- Avoid heavy scraping on the mastic joint
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
Why deal with it now?
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. Where a wall is exposed, as many are in small places like High Ongar, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why us?
- Quality sealants from Arbo and Everbuild
- Experience in homes, commercial sites and hotels
- Sanitary silicone with an anti-fungal additive in wet areas
- Fully insured