Hertfordshire · England
Hexton Sand Mastic
Sand mastic in Hexton from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Patchy fillers round a sash window
- Cracked mastic round a front door frame
- Mastic dropping out of the joint
Sand mastic in Hexton
We work across Hexton renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. We’re often asked to deal with gaps where the frame meets the masonry and draughts and rain around sash boxes, on timber door frames, stone surrounds and sash and case windows.
Around Hexton, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or drop us an email.
- Where
- Hexton (SG5)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
FAQs for Hexton
Can you help a landlord with a rental near Harlington station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Is Hexton in your area for sand mastic?
Yes. Our work covers London and the South East, and Hexton is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Do I need permission for sand mastic on a listed building?
Checking first is sensible. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. Timing depends on the weather and the joint.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we’ll talk you through it.
What sealant work can’t fix
We will not take on work that will not last, so here’s what sealant can’t put right:
- Sashes that rattle, stick or won’t open
- Planning or listed building consent (your local planning authority decides)
- Damaged stone surrounds
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Surfaces we seal
- Timber door frames
- Sash and case windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Tenement windows
What the job involves on each surface
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we will confirm access.
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Signs you need sand mastic in Hexton
Age is the main cause. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
Common reasons people contact us include:
- Failed mastic on an exposed elevation
- Gaps round a timber door in stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
- Old cement repairs round a window that have failed
If you look after a building such as Hexton Junior Mixed and Infant School, the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- How much experience the applicator has
- Which sealant they’ll use, and why
- When the joint can take water or movement
- Whether they seal over old material or remove it
Towns and villages near Hexton
Other services in Hexton
Frames and glazing around Hexton
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. 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. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
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. Letting a property close to Harlington station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Hexton is in Hertfordshire. Homes, rented property, offices and hotels in Hexton is covered for sand mastic. Every job comes with our 12-month guarantee. Our area takes in 381 places across Hertfordshire. You can also see our page for London, roughly 34 miles from Hexton.
Every address in SG5 is covered for sand mastic. If you’re just outside Hexton, we cover 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). Within a short drive, we also cover 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).
Landmarks near Hexton
Typical jobs here are in homes near Recreation Ground and the streets around them. Hexton’s nearest station is Harlington station, roughly 4.5 miles west of the centre. Nearby you will also find Ravensburgh Castle (0.9 miles south-west) and John Dony Field Centre (3.9 miles south). Green spaces nearby include Butts Hill and Barton Gravel Pit.
How we quote for sand mastic
We don’t publish a price list, because jobs vary so much. What we look at:
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
- The type of sealant required
- The number and length of the joints
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, phone 0345 464 0079 or email us and we will give you an honest view and a quote.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- If someone has resealed it before
- Photos by email, if that is easy
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or send us an email.
How it works
The work is kept neat and contained to the area we are working on, so you can get on with your day. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we tell you how long to leave it before we go. For a village or hamlet like Hexton, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- Clear the area around the work
- On commercial sites, let us know about site rules
- Mention any tricky access
Get a quote
For sand mastic in Hexton, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
Leave it or put it right?
Not every filler suits an old window surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. Older cottages and farmhouses around Hexton can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
Why us?
- Fully insured
- 4.9 on Google from 180+ five-star reviews
- Over 20 years’ experience
- Anti-fungal silicone where joints get wet
Read what affects the cost or customer reviews.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.