Hertfordshire · England
Graveley Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Graveley, with a 12-month guarantee on every job. Ask us for a quote.
- Gaps where the frame meets the masonry
- Draughts and rain around sash boxes
- Mastic dropping out of the joint
Sand mastic in Graveley
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap so the surround looks right again. We work on tenement windows, sash and case windows and stone surrounds, and people most often call us about gaps between timber frames and stone or brick and mastic worn away on windows facing the weather.
Homes in small places like Graveley often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Graveley (SG4)
- Region
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlord and commercial work in Graveley
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
FAQs for Graveley
Do you cover smaller places like Graveley?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Stevenage station. Can you help?
Yes. We work for letting agents and landlords as well as householders. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
How long does sand mastic take to go off?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will advise.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
Is there any odour?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Do you offer different sealant colours?
We’ll suggest a colour to suit the surroundings, from white and clear to greys and other shades. The product needed can limit the range.
Graveley homes and the weather
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Knebworth House (about 4.4 miles south) are a reminder that the area around Graveley has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Graveley Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Graveley is about 2 miles north-west of Stevenage, in Hertfordshire. We carry out sand mastic for homes and businesses in Graveley and nearby, as part of our work across Hertfordshire. Our Hertfordshire coverage runs to 381 places, Graveley among them. We also work in London, around 31 miles away.
Here we cover the SG4 postcode area for sand mastic. We cover properties on High Street, Oak Lane and Ashwell Close and the roads around them. Neighbouring places we cover for sand mastic include Todd's Green (1 mile south-west), Great Wymondley (1 mile north-west), Little Wymondley (1 mile west), Titmore Green (1 mile south-west) and Lower Titmore Green (1 mile south-west). We also work in nearby towns such as St Albans (14 miles south), Welwyn Garden City (10 miles south), Harpenden (10 miles south-west), Hitchin (3 miles west), Hoddesdon (15 miles south-east) and Hatfield (12 miles south).
Landmarks near Graveley
In Graveley, that means homes and buildings near Waggon And Horses Public House, Church of Saint Nicholas and The John Henry Newman School, among other places. For rail, the closest station is Stevenage station, about 2.4 miles south of the centre. Other landmarks nearby include Wymondley Castle (1.1 miles west) and Stevenage Museum (2.4 miles south). Open spaces near Graveley include Purwell Ninesprings.
What sealant work cannot fix
To be straight with you, there are a few things sealant won’t fix:
- Decisions on consent for listed homes
- Sashes that need overhauling
- Damaged stone surrounds
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Where we work in Graveley
- Sash and case windows
- Brick reveals
- Period & listed homes
- Timber door frames
- Tenement windows
- Stone surrounds
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Ask the planning authority about consent for listed or conservation-area homes
- Clear gutters so water does not pour onto the windows
- Sort the mastic before the decorators arrive
- Ask a joiner to look at soft timber first
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens.
How it works
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we have agreed what’s being done, we protect the area and start. Most jobs take anything from a few hours to a full day, depending on how many windows. In a small place like Graveley, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Let us know if you’ve seen damp or leaks
- Tell us if parking is tricky
- Keep children and pets away from the work area
Ask for a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or send us an email.
Read more
What affects the quote in Graveley
We quote each job individually. This is what makes a difference:
- Any mould that needs treating
- The number of rooms or windows
- Which sealant suits the joint
- Access and height
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email.
Asking for a quote
There’s no need for technical detail. Just tell us:
- How we’d reach the joints
- Where the property is
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
What the job involves on each surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Common problems we fix in Graveley
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Any of these means the joints need attention:
- Silicone on a period window that looks wrong
- Gaps between timber frames and stone or brick
- Mastic worn away on windows facing the weather
- Patchy fillers round a sash window
If you let a flat or house near Stevenage station, older sash windows in a rental need their mastic kept sound to keep the weather out.
What your quote should include
- How hidden problems are handled
- How the surfaces are prepared before sealing
- Which colour the sealant will be
- What insurance they hold