Essex · England
Mountnessing Window Mastic
Specialist window mastic for Mountnessing: careful preparation, the right product and tidy work. Call for a quick quote.
- Old mastic that has gone black or come away
- Cracked sealant at the sill ends
- Cold air getting in at the frame edge
How we handle window mastic in Mountnessing
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a one-year guarantee on the work. If you’re dealing with gaps between the frame and the inside reveal and cold air getting in at the frame edge, we can put it right, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Mountnessing is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Mountnessing (CM15)
- Wider area
- Essex
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the quote in Mountnessing
Jobs vary more than people expect. What affects the quote:
- When we can work, for business premises
- Access and height
- Whether there’s mould to deal with
- Which sealant suits the joint
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Asking for a quote
Before you ask for a quote, have a think about:
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- The type of property
- Any previous sealing or DIY work
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Landlords, agents and businesses in Mountnessing
We also work for property managers and facilities teams. Several sites can go on one quote, and we are fully insured for the work.
Letting agents and landlords in Mountnessing can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Common problems we fix in Mountnessing
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
These are the problems we’re asked about most:
- Whistling draughts around closed windows
- Untidy mastic left by window fitters
- Cracked sealant at the sill ends
- Mastic that has split away from the wall
Letting a property close to Ingatestone station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What to look for in a quote
- What the cure time is
- What guarantee comes with the work
- How the joint is cleaned and prepared
- How the colour is chosen
Towns and villages near Mountnessing
Also in Mountnessing
FAQs for Mountnessing
Is Mountnessing within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is Mountnessing in your area for window mastic?
Yes, Mountnessing is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Do you have sealant for grey or black windows?
Yes. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Do you work for letting agents?
Yes, regularly. We can quote for several properties at once.
Mountnessing homes and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Ingatestone Hall (about 1.6 miles east) nearby, there’s older building stock in the area around Mountnessing 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.
If you look after a building such as Mountnessing Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s. Ingatestone Hall, about 1.6 miles east, is one of the historic houses in the wider area around Mountnessing.
Mountnessing is about 3 miles north-east of Brentwood, in Essex. Whether you are in the middle of Mountnessing or further out, we cover window mastic for every kind of property. Across Essex, we cover 644 places, Mountnessing among them. There’s also a page for Chelmsford, roughly 8 miles from Mountnessing.
All of CM15 is within our area for window mastic. You’ll find streets such as Church Road, Roman Close and Roman Road. Close by, we work in Swallows Cross (1 mile north-west), Green Street (1 mile north), Ingatestone (1 mile north-east), Buttsbury (2 miles east) and Hutton (2 miles south). We also work in nearby towns such as Chelmsford (8 miles north-east), Basildon (7 miles south-east), Harlow (13 miles north-west), Brentwood (3 miles south-west), Maldon (15 miles east) and Canvey Island (13 miles south-east).
Landmarks near Mountnessing
In Mountnessing, that means homes and buildings near Shenfield High School, Hutton Country Park and George and Dragon pub, among other places. The closest station to Mountnessing is Ingatestone station, roughly 1.6 miles north-east of the centre. Well-known places in the area include Brentwood Community Hospital (2.7 miles south-west). Green spaces nearby include Norsey Wood.
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
What happens if it’s left?
Draughts and leaks do not always mean new 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. Around Mountnessing, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why us?
- White, clear, grey or coloured to suit, where the product allows
- Fully insured
- Tidy, careful work
- Rated 4.9 stars on Google
See what affects the cost and what customers say.
What happens on the day
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours for a few frames, or a day or more for a whole house, including the tidy-up. Somewhere as small as Mountnessing, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Keep children and pets away from the work area
- Tell us if parking is tricky
Get a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Advice
When it is not the sealant
Sealant isn’t the answer to every problem, and we will tell you before we start. Sealant won’t put right:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A door that needs adjusting, rehanging or new seals
- Rotten timber, which needs a joiner first
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Window sills
- Aluminium frames
- Composite doors
- Timber windows & doors
- uPVC windows
- Patio & French doors