Buckinghamshire · England
Sand mastic for sash & case windows in Lye Green, Buckinghamshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Lye Green. Fully insured, ARBOMaster approved and guaranteed for a year.
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
- Old cement repairs round a window that have failed
Surface by surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Sand mastic in Lye Green, done properly
We renew sand mastic around sash windows and doors set in stone or brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. Typical jobs include weathered mastic on the most exposed windows and cracked mastic round a front door frame, on period & listed homes, stone surrounds and timber door frames.
Outdoor sealant needs dry, clean surfaces, so work on frames around Lye Green is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
You’re covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Where
- Lye Green (HP5)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we’re called out for in Lye Green
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint and we normally remove them.
Most people get in touch when they notice one of these:
- Open joints round the window box
- Mastic worn away on windows facing the weather
- Modern sealant on a period surround
- Gaps round a timber door in stone or brick
If you live in an older home near St George's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- How long to leave it before use
- Whether they’re fully insured
- Whether you can choose the colour
- Is the old sealant removed completely?
Aftercare tips
A little care helps the new joints last. Our advice:
- Sort the mastic before the decorators arrive
- Check with your local planning authority if your home is listed
- Have rotten timber repaired before new mastic goes in
- Do not run silicone over sand mastic
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
What sand mastic looks like in Lye Green
The South East is one of 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 Chenies Manor House (about 3.8 miles south-east) are a reminder that the area around Lye Green has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you look after a building such as Brushwood Junior School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Berkhamsted station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Lye Green is about 1 mile north-east of Chesham, in Buckinghamshire. Every kind of property in Lye Green can book us for sand mastic. The work is guaranteed for a year. Across Buckinghamshire, we cover 263 places, and Lye Green is one of them. Our Reading page covers work nearby.
We work across the HP5 postcode area for sand mastic and the streets around it. You’ll find streets such as Rushmere Lane, Two Dells Lane and Lycrome Road, and we cover them all. Other places close to Lye Green include Orchard Leigh (1 mile east), Botley (1 mile south), Tyler's Hill (1 mile south), Ley Hill (1 mile south-east) and Ashley Green (1 mile north). Within a short drive, we also cover Aylesbury (12 miles north-west), High Wycombe (10 miles south-west), Marlow (13 miles south-west), Amersham (3 miles south), Beaconsfield (8 miles south) and Chalfont St Peter (8 miles south).
Local landmarks in Lye Green
We work in homes and buildings around Chesham Grammar School and The Hen And Chickens Public House, among other places. The nearest railway station is Berkhamsted station, about 3.1 miles north. Nearby you’ll also find Hawridge Court (2.5 miles north-west) and Amersham Hospital (4.3 miles south-west). For a walk, there’s Sands Bank.
What we do, step by step
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the job takes a few hours per window, depending on the condition of the joints for a typical job. Somewhere like Lye Green needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Keep pets and children clear of the area while we work
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or drop us an email and describe the job.
Related advice
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
How we quote for sand mastic
The quote reflects the job in front of us. We look at:
- The number and length of the joints
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and give you a clear quote before work begins.
Asking for a quote
When you contact us, these details help:
- How we’d reach the joints
- How many joints, rooms or windows are involved
- Whether it has been sealed before
- The address or postcode of the job
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved before giving you a price.
Why it’s worth doing now in Lye Green
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic is the traditional material and blends with the stone or brick. Around Lye Green, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why choose Mr Mastic in Lye Green
- Approved under the ARBOMaster scheme
- Homes, businesses and hotels
- Arbo and Everbuild products
- We are fully insured
See our cost guide and what customers say.
Lye Green: your questions answered
Will you come out to Lye Green?
Yes, Lye Green is covered. Our work covers 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 Lye Green in your area for sand mastic?
Yes, Lye Green is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing.
When will the new mastic be hard?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Do you work for letting agents?
Yes, often. We can quote for several properties at once, and between tenancies is a good time for the work.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic beds in well.
Do I need permission for sand mastic on a listed building?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
What do you need from me for a quote?
Let us know what needs doing and where. If we need more, we will ask.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new sealant bonds properly.