Hertfordshire · England
Sand Mastic in Thundridge
Sand mastic in Thundridge from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic in Thundridge, done properly
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. If you’re dealing with cement or filler used on old window joints that has cracked and failed mastic on an exposed elevation, we can put it right.
Somewhere as small as Thundridge, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Our work is backed for twelve months.
- Place
- Thundridge (SG12)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why act early in Thundridge
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall, so dealing with it now protects both. In a small place like Thundridge, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Thundridge
- 4.9 on Google from 180+ five-star reviews
- Neat joints and a tidy finish
- Trusted Arbo and Everbuild sealants
- More than 20 years in sealant work
What affects the cost of sand mastic
For a quick quote, just ask. What matters most is:
- Which sealant suits the joint
- Any working-time requirements on site
- Mould in or behind the old joints
- How much old sealant there is and how hard it is to remove
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email.
What we need to know
When you contact us, these details help:
- Photos by email, if that is easy
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
- The address or postcode of the job
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Planning or listed building consent (your local planning authority decides)
- Sashes that need overhauling
- Cracked or broken glass
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Where we work in Thundridge
- Timber door frames
- Tenement windows
- Period & listed homes
- Brick reveals
- Sash and case windows
- Stone surrounds
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Frames and glazing around Thundridge
With historic houses such as Much Hadham Palace (about 4.8 miles east) nearby, there’s older building stock in the area around Thundridge as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Thundridge Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s. Homes close to Parish Church of St Mary include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Ware station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Thundridge is about 1 mile north of Ware, in Hertfordshire. Every kind of property in Thundridge is covered for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. We cover 381 towns and villages across Hertfordshire, large and small. London is on our list too, around 23 miles away.
Postcode districts we cover here for sand mastic: SG12. If you need sand mastic at a property on Woodlands Road, Cold Christmas Lane and Ducketts Wood or a nearby road, we can help. If you’re just outside Thundridge, we cover Wadesmill (1 mile north), Cold Christmas (1 mile east), High Cross (1 mile north), Ware (1 mile south) and Tonwell (2 miles west). Larger places within reach include Stevenage (8 miles north-west), St Albans (14 miles south-west), Bishop's Stortford (8 miles east), Welwyn Garden City (7 miles west), Harpenden (14 miles west) and Hitchin (13 miles north-west).
Around Thundridge
Locally, jobs take us to homes and businesses close to Sow & Pigs pub and The Chauncy School. The closest station to Thundridge is Ware station, about 1.8 miles south of the centre. Other landmarks nearby include Hertford County Hospital (3.6 miles south-west) and Barrowfield (2.5 miles south). Green spaces nearby include King's Meads.
Places near Thundridge
Also in Thundridge
How it works
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a single window, longer for several. In a small place like Thundridge, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic is not too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
Related advice
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
FAQs for Thundridge
Can you do sand mastic in Thundridge?
Yes. We work across London and the South East, and Thundridge is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing.
Can you help a landlord with a rental near Ware station?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They decide whether consent is needed.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Is it possible to take out silicone and use sand mastic instead?
Yes. We remove the silicone and clean the joint before the sand mastic goes in.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Find out about consent before window work on a listed home
- Plan mastic work ahead of painting
- Keep modern sealant off the mastic
- Clear gutters so water doesn’t pour onto the windows
Leave the new mastic alone while it firms up. It skins over quickly, but takes longer to harden fully.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.