Buckinghamshire · England
Naphill Sand Mastic
Specialist sand mastic for Naphill: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Modern sealant on a period surround
- Failed mastic on an exposed elevation
- Window mastic to renew ahead of painting
When it is not the sealant
New sealant cannot fix everything, and we will tell you before any work starts. It won’t solve:
- Cracked or broken glass
- Sashes that rattle, stick or won’t open
- Planning or listed building consent (your local planning authority decides)
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Timber door frames
- Sash and case windows
- Stone surrounds
- Brick reveals
- Tenement windows
- Period & listed homes
Sand mastic in Naphill, done properly
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. If you have wind and rain getting in round a sash window and silicone on a period window that looks wrong, we can put it right, whatever the surface.
Homes in small places like Naphill often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
You get a 12-month guarantee, the same in Naphill as everywhere else we work.
- Place
- Naphill (HP14)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Naphill
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. Around Naphill, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
Why us?
- Arbo and Everbuild products
- Over 20 years’ experience
- Anti-fungal silicone where joints get wet
- 12-month guarantee on every job
Take a look at our cost guide and what customers say.
Also near Naphill
Other services in Naphill
Sand mastic in Naphill: local notes
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. With historic houses such as Hughenden Manor (about 1.5 miles south-east) nearby, there’s older building stock in the area around Naphill as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For site and facilities teams at buildings such as Naphill and Walters Ash School, its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as Church of St Botolph, the joint between an old wall and a newer frame is normally the first place rain gets in. If you let a flat or house near Saunderton station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Naphill is about 3 miles north-west of High Wycombe, in Buckinghamshire. From the centre of Naphill to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Buckinghamshire coverage runs to 263 places, and Naphill is one of them. There’s also a page for Reading, roughly 17 miles from Naphill.
Every address in HP14 is covered for sand mastic. That includes homes and businesses on Christopher Close, Main Road and Purssells Meadow and the roads around them. If you’re just outside Naphill, we cover Walter's Ash (1 mile north-west), Lower North Dean (1 mile north-east), Hughenden Valley (1 mile east), Upper North Dean (1 mile north) and Downley (1 mile south). We also work in nearby towns such as Aylesbury (11 miles north), High Wycombe (3 miles south-east), Chesham (8 miles north-east), Marlow (6 miles south), Amersham (8 miles east) and Beaconsfield (7 miles south-east).
Near you in Naphill
We work in homes and buildings around The Royal Grammar School, Pipers Corner School and The Wheel pub and the streets around them. The closest station to Naphill is Saunderton station, about 2.1 miles west. A little further out are Eden (2.8 miles south) and High Wycombe Castle (2.8 miles south-east). For a walk, there’s Prestwood Local Nature Reserve.
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to a full day, depending on how many windows from start to finish. In a small place like Naphill, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Tell us if parking is tricky
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
Getting a quote
To get a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Related advice
Naphill: your questions answered
Is Naphill within the area you cover?
Yes, Naphill 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.
I let a flat near Saunderton station. Can you help?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
What exactly is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or email us.
Will the old sealant be removed?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected.
How long does the job take?
A typical job takes a few hours for a single window, longer for several. We’ll confirm how long when we quote.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What affects the quote in Naphill
Call for a quick quote. What matters most is:
- The number and length of the joints
- How many rooms, windows or areas are involved
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
Asking for a quote
What to tell us when you ask for a quote:
- Access, such as stairs, a lift or height
- Where the property is
- Pictures of the joints, sent by email
- Whether it’s a home or a business
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or send us an email with the details.
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Surface by surface
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
Timber door frames
Doors face weather and wear and the mastic can crack early. We rake it out and renew it.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for.