Essex · England
Sand mastic for sash & case windows in King Street, Essex
Problem with your window and door surrounds in King Street? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
- Draughts and rain around sash boxes
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Sand mastic for homes and businesses in King Street
We work across King Street renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand for a neat, traditional finish. We work on sash and case windows, timber door frames and brick reveals, and common reasons people get in touch are cement or filler used on old window joints that has cracked and mastic that needs renewing before redecorating.
Around King Street, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
You get a one-year guarantee, the same in King Street as everywhere else we work.
- Where
- King Street (CM4, CM5)
- Wider area
- Essex
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Also near King Street
More services for King Street
When to call us in King Street
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Look out for any of the following:
- Weathered mastic on the most exposed windows
- Open joints round the window box
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic round period door frames that has failed
Letting a property close to Ingatestone station? Then any sash windows need sound mastic to keep draughts and rain out.
What to look for in a quote
- How the joint is cleaned and prepared
- How much experience the applicator has
- What the cure time is
- Whether the sealant suits the joint
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Keep modern sealant off the mastic
- Take care around the mastic when scraping paint
- Keep sills and gutters clear so water drains away
- Plan mastic work ahead of painting
Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Frames and glazing around King Street
With historic houses such as Ingatestone Hall (about 5 miles south-east) nearby, there’s older building stock in the area around King Street as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
For site and facilities teams at buildings such as Blackmore Primary School, its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
King Street is about 6 miles north of Brentwood, in Essex. Homes, rented property, offices and hotels in King Street can book us for sand mastic. The work is guaranteed for a year. We cover 644 towns and villages across Essex. For nearby work, see our Chelmsford page (8 miles or so).
Here we cover the CM4 and CM5 postcode area for sand mastic. Nearby, we also carry out sand mastic in Norton Mandeville (1 mile north-west), High Ongar (1 mile west), Cannon's Green (2 miles north-west), Chipping Ongar (2 miles west) and Fyfield (2 miles north-west). We also work in nearby towns such as Chelmsford (8 miles east), Basildon (12 miles south-east), Harlow (9 miles north-west), Brentwood (6 miles south), Billericay (8 miles south-east) and Rayleigh (15 miles south-east).
What’s near King Street
We work in homes and buildings around The Ongar Academy. The closest station to King Street is Ingatestone station, about 4.5 miles south-east of the centre. Nearby you’ll also find Willingale Doe (3.1 miles north) and Brentwood Community Hospital (5.7 miles south).
Landlord and commercial work in King Street
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
What sealant work can’t fix
We will not take on work that will not last, so here’s what sealant can’t put right:
- Timber that has rotted
- Sash cords, weights and draught-proofing of the sashes
- Whether work needs listed building consent
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
What we seal
- Tenement windows
- Period & listed homes
- Sash and case windows
- Brick reveals
- Timber door frames
- Stone surrounds
What happens on the day
At the end, we look at the finished work together. The work normally takes a few hours per window, depending on the condition of the joints, depending on the amount of work. Somewhere like King Street 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.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
Getting a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we’ll come back to you with a quote.
Advice
How the job changes by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is normally favoured.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
King Street: your questions answered
Can you help a landlord with a rental near Ingatestone station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Do you cover King Street for sand mastic?
Yes. Our work covers London and the South East, and King Street is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Can I choose the sealant colour?
Normally, yes. Sealants come in white, clear, grey and other colours, and we will agree it with you first.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we are fully insured.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What information do you need?
Let us know what needs doing and where, with pictures by email if possible. If we need more, we’ll ask.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.