Hertfordshire · England
Temple Dinsley Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Temple Dinsley. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps between timber frames and stone or brick
- Draughts and rain around sash boxes
- Cement or filler used on old window joints that has cracked
Sand mastic in Temple Dinsley
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditionally, sand mastic is left unpainted, so ask us before you decorate. Typical jobs include old sand mastic that has cracked, crumbled or fallen out and gaps round a timber door in stone or brick, across stone surrounds, tenement windows and timber door frames.
Outdoor sealant needs dry, clean surfaces, so work on frames around Temple Dinsley is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Our work is backed for twelve months, in Temple Dinsley and everywhere else we cover.
- Location
- Temple Dinsley (SG4)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Temple Dinsley
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Landlords and agents in Temple Dinsley can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
What happens if it’s left?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. Where a wall is exposed, as many are in small places like Temple Dinsley, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why Temple Dinsley clients choose us
- Rated 4.9 stars on Google
- We never seal over old sealant
- A 12-month guarantee on all work
- 20+ years of sealant experience
Take a look at our cost guide and our reviews.
Signs you need sand mastic in Temple Dinsley
Over the years, sand mastic weathers. It dries out, cracks and loses its grip from the frame or the masonry.
Keep an eye out for these signs:
- Cracked mastic round a front door frame
- Old cement repairs round a window that have failed
- Mastic dropping out of the joint
- Mastic that needs renewing before redecorating
For site and facilities teams at buildings such as Preston Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- How the surfaces are prepared before sealing
- How much experience the applicator has
- Are they insured?
- What happens if the job turns out different
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Go gently near the mastic when preparing windows
- Avoid patching sand mastic with silicone
- Get any rot dealt with first
- Make sure water runs off the sill
Don’t run silicone over the new mastic. If anything cracks, get it looked at before trying a quick fix.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Sashes that need overhauling
- Rotten sashes, sills or window boxes (a joiner’s job)
- Planning or listed building consent (your local planning authority decides)
If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Stone surrounds
- Brick reveals
- Timber door frames
- Tenement windows
- Period & listed homes
- Sash and case windows
What the job involves on each surface
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Temple Dinsley: your questions answered
Do you work for landlords with property near Stevenage station?
Yes. We work for landlords and agents as well as householders. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Will you come out to Temple Dinsley?
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.
Can you quote for more than one area?
Yes. Just list everything you need.
Will there be a smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
What do you need from me for a quote?
A short description and the location, plus photos if you have them. If we need more, we’ll ask.
Can I choose the sealant colour?
We help you choose a colour that suits. The choice depends on the product the joint needs.
Can you replace silicone on a period window with sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
What does sand mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
How the visit works
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for a single window, longer for several. Somewhere like Temple Dinsley needs a little journey planning: 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.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention if the joints have been sealed before
- Clear the area around the work
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Read more
Places near Temple Dinsley
What else we do in Temple Dinsley
Windows and doors in Temple Dinsley
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. With historic houses such as Knebworth House (about 3.5 miles south-east) nearby, there’s older building stock in the area around Temple Dinsley as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Church of St Martin, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Stevenage station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Temple Dinsley is about 3 miles south of Hitchin, in Hertfordshire. Wherever you are in the SG4 postcode area, we cover sand mastic for homes and businesses. Temple Dinsley is one of 381 places in Hertfordshire we cover. Our London page covers work nearby (29 miles or so).
Postcode districts we cover here for sand mastic: SG4. Local streets include St Albans Highway and Hitchwood Lane, and we cover them all. If you’re just outside Temple Dinsley, we cover Poynders End (1 mile north-east), Preston (1 mile west), Langley End (1 mile south-east), Little Almshoe (1 mile north-east) and St Ibbs (1 mile north-east). Further out, we also cover Hemel Hempstead (13 miles south-west), Stevenage (4 miles east), St Albans (11 miles south), Welwyn Garden City (8 miles south-east), Harpenden (7 miles south-west) and Hitchin (3 miles north).
Local landmarks in Temple Dinsley
Locally, jobs take us to homes and businesses close to The Red Lion Public House. For rail, the closest station is Stevenage station, about 2.9 miles east of the centre. Well-known places in the area include North Hertfordshire Museum (2.9 miles north) and Lister Hospital (2.9 miles north-east). Not far away are Markham's Hill and Purwell Ninesprings.