Essex · England
Great Dunmow Window Mastic
Mastic around window and door frames, sills and patio doors for homes and businesses in Great Dunmow and across Essex. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Mastic that has split away from the wall
- Rain getting in at the frame or under the sill
- Cold air getting in at the frame edge
Great Dunmow homes and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Dunmow St Mary's Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near Parish Church of St Mary the Virgin, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Great Dunmow is about 9 miles west of Braintree, in Essex. Anywhere in CM6, we cover window mastic for homes and businesses. Great Dunmow is one of 644 places in Essex where we work for window mastic. There’s also a page for Chelmsford, roughly 11 miles from Great Dunmow.
Postcode districts we cover here for window mastic: CM6. Whether your property is on Market Place, High Street and Station Road or anywhere close by, we can help. You will find Great Dunmow on the B1008 and B1057, so it’s easy for us to get to. Close by, we work in Church End (1 mile north-east), Little Easton (2 miles north-west), Barnston (2 miles south-east), High Roding (3 miles south-west) and Great Canfield (3 miles south-west). Larger places within reach include Chelmsford (11 miles south-east), Braintree (9 miles east), Harlow (13 miles south-west), Witham (13 miles south-east), Saffron Walden (11 miles north-west) and Halstead (13 miles east).
Landmarks near Great Dunmow
We work in homes and buildings around Helena Romanes School and Sixth Form Centre and The Chequers Public House. The closest station to Great Dunmow is Stansted Airport station, roughly 4.3 miles west of the centre. Well-known places in the area include Little Easton Moat (1.6 miles north-west).
About our window mastic in Great Dunmow
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. We’re often asked to deal with leaking joints at the ends of sills and draughts coming in around windows and doors, on timber windows & doors, aluminium frames and window sills.
In smaller places like Great Dunmow, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
Big or small, you get the same one-year guarantee.
- Place
- Great Dunmow (CM6)
- Region
- Essex
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Looking after it afterwards
After the cure time, these simple habits help:
- Make sure the drainage slots are not blocked
- Repaint timber before it’s bare
- Clean frames with a soft cloth and soapy water
- Do not aim a pressure washer at the joints
Check the drainage slots in the frames are not blocked, so rain drains out rather than building up at the sealant.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
How we quote for window mastic
For a quick quote, just ask. The main things that affect it are:
- The size of the job
- The type of sealant required
- Any working-time requirements on site
- Mould in or behind the old joints
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
There’s no need for technical detail. Just tell us:
- Access, such as stairs, a lift or height
- Whether it’s a home or a business
- If someone has resealed it before
- Where the property is
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.
FAQs for Great Dunmow
Can you help a landlord with a rental near Stansted Airport station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Will you come out to Great Dunmow?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you don’t need to watch us work.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
How long does it take to reseal the windows on a house?
It depends on access, the old mastic and the size of the frames. You’ll know the timing when we quote.
Landlords, agents and businesses in Great Dunmow
Landlords and agents in Great Dunmow can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Surface by surface
Window sills
Masonry sills can have joints where water gets in, including the one between the sill and the frame above. We seal those with a sealant suited to masonry.
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it.
Places near Great Dunmow
What else we do in Great Dunmow
When to call us in Great Dunmow
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, so it comes away long before its time.
People normally contact us after spotting something like this:
- Damp patches on the reveal after heavy rain
- Cracked sealant at the sill ends
- Rushed sealant from a window installation
- Draughts coming in around windows and doors
For landlords with property near Stansted Airport station, renewing tired window mastic between tenants heads off draught and damp complaints.
What your quote should include
- Are they insured?
- Whether you can choose the colour
- Is VAT in the price?
- When the joint can take water or movement
The process
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours for a few frames, or a day or more for a whole house. A visit to Great Dunmow 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 start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
- Let us know if you’ve seen damp or leaks
Ask for a quote
If you are in Great Dunmow and need window mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.