Essex · England
Theydon Bois Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Theydon Bois, backed by a 12-month guarantee. Ask us for a quote.
- Draughty sash windows at the surround
- Mastic dropping out of the joint
- Cement or filler used on old window joints that has cracked
Sand mastic in Theydon Bois
Traditional burnt sand mastic blends with stone and brick surrounds. It’s a good fit for period properties where a modern sealant bead would stand out. If you have mastic that needs renewing before redecorating and a silicone bead on a sash window that spoils the look, we can put it right, on brick reveals, period & listed homes and stone surrounds alike.
In a smaller place like Theydon Bois, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Theydon Bois (CM16)
- Wider area
- Essex
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
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 doesn’t work out, we can still put it right.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
What affects the cost of sand mastic
Your quote is based on your job. We take into account:
- How many areas need sealing
- The product the joint needs
- When we can work, for business premises
- How easy the joints are to reach
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The address or postcode of the job
- Whether it’s a home or a business
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
Every job is quoted individually. Simply call 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
What the job involves on each surface
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.
Stone surrounds
The stone is treated with care when the old mastic comes out.
Theydon Bois homes and the weather
With historic houses such as Hill Hall (about 2.3 miles east) nearby, there’s older building stock in the area around Theydon Bois as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
Letting a property close to Chingford station? Then any sash windows need sound mastic to keep draughts and rain out. Schools such as Theydon Bois Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Theydon Bois is about 2 miles north-east of Loughton, in Essex. Wherever you are in the CM16 postcode area, our applicators can take on sand mastic. Theydon Bois is one of 644 towns and villages in Essex we cover. London is on our list too, about 15 miles from Theydon Bois.
Here we cover the CM16 postcode area for sand mastic. If you need sand mastic at a property on Buxton Road, Orchard Drive and Elizabeth Drive or a nearby road, our applicators can take on the job. Theydon Bois sits on or near the B172, which makes travel easy. Neighbouring places we cover for sand mastic include Debden Green (1 mile south-west), Debden (2 miles south), Loughton (2 miles south-west), Upshire (3 miles north-west) and High Beech (3 miles west). Larger places within reach include Harlow (7 miles north), Brentwood (9 miles east), Billericay (14 miles east), Harold Wood (8 miles south-east), Laindon (15 miles south-east) and Buckhurst Hill (4 miles south-west).
Around Theydon Bois
We work in homes and buildings around Queen Victoria Public House and Davenant Foundation School. The closest station to Theydon Bois is Chingford station, about 4.7 miles south-west. Well-known places in the area include St. Margaret's Hospital (2.5 miles north-east) and Epping Signalling Museum (1.6 miles north-east). The countryside around Theydon Bois includes Lippitts Hill and Home Mead.
Common questions in Theydon Bois
I let a flat near Chingford station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do you cover smaller places like Theydon Bois?
Yes. Theydon Bois is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Do you offer different sealant colours?
In most cases you can choose. We will tell you which colours the right product comes in.
Can I add another job to the visit?
Of course. Doing several areas at once is generally more efficient.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or email us.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. All the old silicone is removed first so the mastic beds in well.
Places near Theydon Bois
Also in Theydon Bois
What we do, step by step
We bring everything the job needs with us. After a quick look at the joints together, we protect the area and start. It normally takes a few hours per window, depending on the condition of the joints. A visit to Theydon Bois is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, phone 0345 464 0079 or email us.
Read more
Why act early in Theydon Bois
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. In a smaller place like Theydon Bois, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
What you get with us
- Trusted Arbo and Everbuild sealants
- Full insurance on every job
- 20+ years of sealant experience
- Any old sealant cut out fully, not covered over
Signs you need sand mastic in Theydon Bois
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
These are the problems we are asked about most:
- Gaps round a timber door in stone or brick
- Gaps between timber frames and stone or brick
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
Homes close to Parish Church of St Mary include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What your quote should include
- What preparation is included
- Whether all the old sealant comes out first
- How long the guarantee is
- Whether they’re fully insured
When something else is needed
A few problems are outside what sealant work can do:
- Masonry that needs repairing
- Sashes that need overhauling
- Broken panes
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Theydon Bois
- Stone surrounds
- Timber door frames
- Tenement windows
- Sash and case windows
- Period & listed homes
- Brick reveals