Hertfordshire · England
Sand Mastic in Daw's End
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Daw's End and across Hertfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
- Crumbling sand mastic round a window
What we can’t put right
We won’t take on work that won’t last, so here’s what sealant cannot put right:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Broken panes
- Sashes that rattle, stick or won’t open
If you are not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Daw's End
- Period & listed homes
- Brick reveals
- Tenement windows
- Sash and case windows
- Stone surrounds
- Timber door frames
Sand mastic in Daw's End
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. Renewing it closes the gap and tidies the surround. We work on stone surrounds, sash and case windows and timber door frames, and people most often call us about patchy fillers round a sash window and draughty sash windows at the surround.
Around Daw's End, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
You’re covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Place
- Daw's End (SG9)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Daw's End
More services for Daw's End
Why act early in Daw's End
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry so renewing it early protects the window. In a small place like Daw's End, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What you get with us
- More than 20 years in sealant work
- Tidy, careful work
- Anti-fungal silicone where joints get wet
- Approved under the ARBOMaster scheme
Take a look at our cost guide and our reviews.
Windows and doors in Daw's End
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Church of St George include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Daw's End is in Hertfordshire. Our applicators cover sand mastic for homeowners, landlords and businesses in Daw's End, as part of our work across Hertfordshire. Daw's End is one of 381 towns and villages in Hertfordshire where we work. You can also see our page for Chelmsford, roughly 25 miles from Daw's End.
Every address in SG9 is covered for sand mastic. If you’re just outside Daw's End, we cover Anstey (1 mile north), Great Hormead (1 mile south), Wyddial (2 miles west), Brent Pelham (2 miles south-east) and Lower Green (2 miles north-east). Larger places within reach include Stevenage (11 miles south-west), Bishop's Stortford (9 miles south-east), Hitchin (13 miles west), Hoddesdon (15 miles south), Hertford (13 miles south-west) and Letchworth (11 miles west).
Near you in Daw's End
Around Daw's End, our work takes us to homes and buildings near The Blind Fiddler pub and the streets around them. Nearby you will also find Anstey Hales Farm (0.6 miles north-east). Open spaces near Daw's End include Hawkins Wood.
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Go gently near the mastic when preparing windows
- Leave the new mastic unpainted
- Have rotten timber repaired before new mastic goes in
- Avoid patching sand mastic with silicone
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
Landlords, agents and businesses in Daw's End
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes anything from a few hours to a full day, depending on how many windows. Somewhere as small as Daw's End, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
- Clear the area around the work
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Related advice
Daw's End questions
Is sand mastic in Daw's End guaranteed?
All our work, in Daw's End and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Is Daw's End within the area you cover?
Yes, Daw's End is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Is consent needed for window work on a listed home?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like but the decision is theirs.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we will talk you through it.
Can you match the sealant colour?
Usually, yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. The old silicone has to come out completely so the mastic can sit properly.
What we’re called out for in Daw's End
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint, and they generally need raking out.
The problems people usually mention when they call include:
- Patchy fillers round a sash window
- Gaps round a timber door in stone or brick
- Gaps where the frame meets the masonry
- Mastic that needs renewing before redecorating
If you look after a building such as Anstey First School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- When the joint can take water or movement
- What happens if the job turns out different
- What product goes in the joint
- Which colour the sealant will be
How we quote for sand mastic
There’s no set price list, because jobs vary so much. What we look at:
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
- The number and length of the joints
- Whether the work is at height
Combining jobs into one visit normally makes better use of the time than several visits. We will give you a clear quote for the lot.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- The type of property
- How many joints, rooms or windows are involved
We do not publish a price list. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or send us an email.