Hertfordshire · England
Clothall Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Clothall, backed by a one-year guarantee. Call for a quick quote.
- Mastic round period door frames that has failed
- Mastic worn away on windows facing the weather
- Cement or filler used on old window joints that has cracked
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours for a single window, longer for several, depending on how much there is to do. For a village or hamlet like Clothall, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
Get a quote
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
About our sand mastic in Clothall
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. We’re often asked to deal with silicone on a period window that looks wrong and gaps round a timber door in stone or brick, on stone surrounds, timber door frames and period & listed homes.
Around Clothall, 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.
Each job carries a 12-month guarantee.
- Where
- Clothall (SG7)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Places near Clothall
Other services in Clothall
FAQs for Clothall
Do you cover Clothall for sand mastic?
Yes, Clothall is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Do you cover smaller places like Clothall?
Yes. Clothall is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
How long does the job take?
That depends on how much there is to do, but as a guide it takes anything from a few hours to a full day, depending on how many windows. We’ll give you a better idea when we quote.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
What affects the quote in Clothall
Jobs vary more than people expect. The main factors:
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- How many areas need sealing
- How much there is to do
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and agree the price before starting.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- If someone has resealed it before
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
- Roughly how big the job is
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or send us an email.
Clothall homes and the weather
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of St Mary, the joint between an old wall and a newer frame is generally the first place rain gets in. For landlords with property near Baldock station, any sash windows need sound mastic to keep draughts and rain out. Schools such as Weston Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Clothall is about 3 miles east of Letchworth, in Hertfordshire. Whether you are in the middle of Clothall or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. 381 places in Hertfordshire are on our list, large and small. Our Chelmsford page covers work nearby (32 miles or so).
Postcode districts we cover here for sand mastic: SG7. We also cover Weston (1 mile south-west), Wallington (2 miles north-east), Baldock (2 miles north-west), St Nicholas (3 miles south) and Rooks Nest (4 miles south-west). Larger places within reach include Stevenage (4 miles south), Bishop's Stortford (15 miles south-east), Welwyn Garden City (12 miles south), Harpenden (14 miles south-west), Hitchin (5 miles west) and Hatfield (15 miles south).
Local landmarks in Clothall
Around Clothall, our work takes us to homes and buildings near The Knights Templar School and the streets around them. The closest station to Clothall is Baldock station, about 2.2 miles north-west of the centre. Nearby you’ll also find First Garden City Heritage Museum (3.1 miles west) and Clothall Castle (under half a mile south-east). Open spaces near Clothall include Pryor's Wood.
What sealant work can’t fix
New sealant cannot fix everything, and we will tell you before we start. It won’t solve:
- Sashes that need overhauling
- Decayed frames that need repair
- Crumbling stone or brickwork round the window
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Timber door frames
- Brick reveals
- Stone surrounds
- Sash and case windows
- Tenement windows
- Period & listed homes
How the job changes by surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
For landlords and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Renew mastic before redecorating the windows
- Go gently near the mastic when preparing windows
- Make sure water runs off the sill
- Ask a joiner to look at soft timber first
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.