Buckinghamshire · England
Sand mastic for sash & case windows in Long Crendon, Buckinghamshire
Sand mastic across Long Crendon and nearby, with old sealant always removed completely and a 12-month guarantee.
- Mastic worn away on windows facing the weather
- Tired mastic found when preparing windows for paint
- Wind and rain getting in round a sash window
Sand mastic in Long Crendon, done properly
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on tenement windows, stone surrounds and sash and case windows, and the jobs we see most are gaps round a timber door in stone or brick and gaps between timber frames and stone or brick.
In smaller places like Long Crendon, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
Every job is covered by our 12-month guarantee.
- Where
- Long Crendon (HP18)
- Region
- Buckinghamshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sand mastic looks like in Long Crendon
The South East is one of 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 normally the first place rain gets in. Schools such as Long Crendon School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Long Crendon is about 2 miles north-west of Thame, in Buckinghamshire. Jobs in Long Crendon get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Long Crendon is one of 263 places in Buckinghamshire where we work. We also work in Oxford, about 10 miles from Long Crendon.
We cover every part of HP18 for sand mastic and the streets around it. If you need sand mastic at a property on High Street, The Square and Giffard Way or a nearby road, our applicators can take on the job. We also cover the places around Long Crendon: Chearsley (2 miles north-east), Thame (2 miles south-east), Moreton (3 miles south), Haddenham (3 miles east) and Cuddington (3 miles north-east). Larger places within reach include Aylesbury (8 miles east), High Wycombe (15 miles south-east), Buckingham (15 miles north), Elmhurst (9 miles north-east), Southcourt (8 miles east) and Princes Risborough (8 miles south-east).
Near you in Long Crendon
Around Long Crendon, our work takes us to homes and buildings near Lord Williams's School and The Eight Bells Public House. Long Crendon’s nearest station is Haddenham & Thame Parkway station, roughly 2.3 miles east of the centre. A little further out are Dinton Castle (4.7 miles east) and Thame Community Hospital (2.4 miles south-east). Open spaces near Long Crendon include Snakemoor.
More services for Long Crendon
When it is not the sealant
A few problems are outside what sealant work can do:
- Sashes that rattle, stick or won’t open
- Decayed frames that need repair
- Damaged stone surrounds
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Where we work in Long Crendon
- Stone surrounds
- Period & listed homes
- Tenement windows
- Brick reveals
- Timber door frames
- Sash and case windows
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
We also work for property managers and facilities teams. Several sites can go on one quote, and we are fully insured.
Signs you need sand mastic in Long Crendon
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows.
It’s worth asking for a quote if you see:
- Mastic that needs renewing before redecorating
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
For landlords with property near Haddenham & Thame Parkway station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- What the quote includes, VAT included or not
- Whether all the old sealant comes out first
- How the colour is chosen
- The length of the guarantee
The process
You do not need to clear the whole room or building, just the space around the work. We protect the rest, and the job takes anything from a few hours to a full day, depending on how many windows for a typical job. Parking around Long Crendon is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Mention any tricky access
- Tell us if parking is tricky
- For business premises, tell us about site rules or sign-in
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or email us.
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What the job involves on each surface
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Quotes for sand mastic in Long Crendon
We quote each job individually. These are the things that affect it:
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- The product the joint needs
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
When you call or email, it’s useful to know:
- Pictures of the joints, sent by email
- How we’d reach the joints
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
For sand mastic in Long Crendon, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep sills and gutters clear so water drains away
- Ask us before painting near the mastic
- Ask a joiner to look at soft timber first
- Avoid heavy scraping on the mastic joint
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
Long Crendon questions
Will you come out to Long Crendon?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do sand mastic in Long Crendon?
Yes. Our work covers London and the South East, and Long Crendon is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
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.
How do I get a quote for sand mastic in Long Crendon?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or drop us an email with a short description of the job.
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.
Is it messy?
We keep the work tidy. We protect what’s around the joints.
Can I choose the sealant colour?
Most of the time, yes. We will explain which colours are available and agree one before work begins.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.