Hertfordshire · England
Hexton Window Mastic
Problem with your window and door frames in Hexton? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Untidy mastic left by window fitters
- Sealant in the wrong colour for the frame
- Draughty joints inside around the window
Window mastic in Hexton, done properly
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that can’t flex, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. We work on patio & French doors, uPVC windows and aluminium frames, and people most often call us about water coming in at the bottom corners of a door and mastic that’s falling out in pieces.
In a village or hamlet like Hexton, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Hexton (SG5)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Hexton homes and the weather
Historic houses like Harlington Manor (about 4.3 miles west) are a reminder that the area around Hexton has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Hexton Junior Mixed and Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St Faith (Church of England), frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Hexton is in Hertfordshire. Every kind of property in Hexton can book us for window mastic. Every job comes with our one-year guarantee. Across Hertfordshire, we cover 381 places, Hexton among them. London is on our list too, about 34 miles from Hexton.
All of SG5 is within our area for window mastic, from the main roads to the quietest streets. We also cover the places around Hexton: Pegsdon (1 mile east), Apsley End (2 miles north-east), Hanscombe End (2 miles north), Shillington (3 miles north-east) and Pirton (3 miles east). Larger places within reach include Hemel Hempstead (15 miles south), Stevenage (10 miles south-east), St Albans (15 miles south), Welwyn Garden City (14 miles south-east), Harpenden (10 miles south) and Hitchin (5 miles east).
Around Hexton
Around Hexton, our work takes us to homes and buildings near Recreation Ground, among other places. The nearest railway station is Harlington station, roughly 4.5 miles west. Well-known places in the area include Ravensburgh Castle (0.9 miles south-west) and John Dony Field Centre (3.9 miles south). Not far away are Butts Hill and Barton Gravel Pit.
What we are called out for in Hexton
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. That’s what backing rod is for.
Signs it’s time to call us include:
- Gaps left after new windows were fitted
- Cracked or shrunken mastic around the frame
- Gaps where the sill meets the wall
- Rain getting in at the frame or under the sill
If you let a flat or house near Harlington station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Questions to ask before booking
- The length of the guarantee
- Which colour the sealant will be
- How the joint is cleaned and prepared
- How hidden problems are handled
Why it’s worth doing now in Hexton
Choosing the product is half the job. Interior caulk and bathroom silicone aren’t made for exterior frame joints. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Around Hexton, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Why Hexton clients choose us
- A sealant colour to suit the surroundings
- You choose the colour before work begins
- 20+ years of sealant experience
- 12-month guarantee on every job
Take a look at our cost guide and our reviews.
Quotes for window mastic in Hexton
We quote each job individually. This is what makes a difference:
- Any mould that needs treating
- Whether the work is at height
- How many rooms, windows or areas are involved
- The type of sealant required
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- Roughly how big the job is
- How we’d reach the joints
- The type of property
- The problem you’ve noticed
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
What happens on the day
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a few frames, or a day or more for a whole house and we leave things clean and tidy. In a small place like Hexton, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
How to get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Read more
Landlord and commercial work in Hexton
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Places near Hexton
Other services in Hexton
FAQs for Hexton
Is Hexton within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Harlington station. Can you help?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Do you do commercial work?
Yes. We can plan bigger jobs in stages to suit the site.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Can you do upstairs windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Condensation trapped between the panes
- Worn gaskets, brush seals or a door that has dropped
- A frame that has rotted at the joint
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before booking.
Joints and surfaces we work on
- Composite doors
- uPVC windows
- Aluminium frames
- Patio & French doors
- Window sills
- Timber windows & doors
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Do not use solvent cleaners on the joint
- Keep paint off silicone joints
- Do not aim a pressure washer at the joints
- Keep paint and stain on wooden frames in good order
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.