Essex · England
Theydon Bois Window Mastic
Window mastic in Theydon Bois from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Untidy mastic left by window fitters
- Black, perished sealant on frames
- Cold air getting in at the frame edge
Window mastic in Theydon Bois
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on patio & French doors, timber windows & doors and uPVC windows, and common reasons people get in touch are whistling draughts around closed windows and gaps between the frame and the inside reveal.
In a smaller place like Theydon Bois, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
There’s a 12-month guarantee on every job, large or small.
- Where
- Theydon Bois (CM16)
- Region
- Essex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Theydon Bois
I let a flat near Chingford station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can be quoted together. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Is Theydon Bois in your area for window mastic?
Yes. Our work covers London and the South East, and Theydon Bois is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used before we leave.
Should I try DIY first?
You can, for simple jobs. 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.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or email us.
How long will my window job take?
It depends on access, the old mastic and the size of the frames. We will tell you how long your job needs when we quote.
Do you take out the old sealant first?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
Towns and villages near Theydon Bois
What else we do in Theydon Bois
How the job changes by surface
Patio & French doors
Door frames take knocks and movement every time the doors are used. The sealant must cope with it without cracking.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
What we cannot put right
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- A sash or casement that won’t close properly
- Rotten timber, which needs a joiner first
- Penetrating damp from a failed cavity tray or render
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before you book.
What we seal
- uPVC windows
- Window sills
- Composite doors
- Patio & French doors
- Timber windows & doors
- Aluminium frames
Window mastic in Theydon Bois: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Hill Hall (about 2.3 miles east) are a reminder that the area around Theydon Bois has older buildings as well as new. 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.
Letting a property close to Chingford station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you look after a building such as Theydon Bois Primary School, the mastic around its windows and doors needs looking after like any other building’s. For an older house near a landmark such as Parish Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Theydon Bois is about 2 miles north-east of Loughton, in Essex. Homes, rented property, offices and hotels in Theydon Bois can book us for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our area takes in 644 places across Essex. You can also see our page for London, about 15 miles away.
Jobs for window mastic in CM16 works the same way as everywhere else we cover. Whether your property is on Buxton Road, Orchard Drive and Elizabeth Drive or anywhere close by, we can help. You will find Theydon Bois on the B172, which makes it straightforward to reach with everything needed for window mastic. Neighbouring places we cover for window 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). Further out, we also cover 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).
Near you in Theydon Bois
Around Theydon Bois, our work takes us to homes and buildings near Queen Victoria Public House and Davenant Foundation School and the streets around them. The closest station to Theydon Bois is Chingford station, roughly 4.7 miles south-west of the centre. Nearby you will also find St. Margaret's Hospital (2.5 miles north-east) and Epping Signalling Museum (1.6 miles north-east). For a walk, there’s Lippitts Hill and Home Mead.
Leave it or put it right?
Failed mastic is not a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we will tell you. In a smaller place like Theydon Bois, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Instead of a standard rate, 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 you get with us
- Every job guaranteed for a year
- Tidy, careful work
- A choice of colours where the product allows
- Rated 4.9 stars on Google
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a handful of frames, longer for a whole house. Parking around Theydon Bois is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Mention if the joints have been sealed before
- Tell us about any water getting in
- Let us know about parking restrictions
How to get a quote
Every job is quoted individually. Simply call 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
Related advice
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Avoid blasting the frames with a pressure washer
- Don’t paint over the silicone
- Wipe condensation off the frames
- Keep drainage slots and sill grooves clear
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and a cold room gets colder. Resealing closes it.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the quote in Theydon Bois
The quote reflects the job in front of us. We look at:
- The type of sealant required
- Any mould that needs treating
- When we can work, for business premises
- How easy the joints are to reach
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and give you a clear quote before any work starts.
Asking for a quote
You do not need to know the technical terms. Just tell us:
- Any previous sealing or DIY work
- Whether it’s a home or a business
- Where the property is
- Pictures of the joints, sent by email
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will talk you through the work.