Buckinghamshire · England
Great Missenden Sand Mastic
We cover Great Missenden for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Open joints round the window box
- Modern sealant on a period surround
- Weathered mastic on the most exposed windows
Sand mastic in Great Missenden, 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. If you have cement or filler used on old window joints that has cracked and a silicone bead on a sash window that spoils the look, we can help.
Homes in small places like Great Missenden 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.
Our work is backed for twelve months, in Great Missenden and everywhere else we cover.
- Where
- Great Missenden (HP16)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Great Missenden
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new mastic stays put. In a small place like Great Missenden, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- A 12-month guarantee on all work
- We leave the area clean and tidy
- Anti-fungal sanitary silicone in wet areas
- Over 20 years’ experience
Take a look at how sealant jobs are priced or what customers say.
Questions from Great Missenden
Is Great Missenden in your area for sand mastic?
Yes, Great Missenden is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will send you a clear quote.
Will you come out to Great Missenden?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you match the sealant colour?
We help you choose a colour that suits. The product needed can limit the range.
Where is Mr Mastic based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so the joint is cleaned back first.
What exactly is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
What sealant work can’t fix
In fairness, there are a few things sealant won’t fix:
- Putty and glazing repairs
- Planning or listed building consent (your local planning authority decides)
- Damaged stone surrounds
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Stone surrounds
- Timber door frames
- Brick reveals
- Sash and case windows
- Tenement windows
- Period & listed homes
How we quote for sand mastic
We quote each job individually. This is what makes a difference:
- The type of sealant required
- How easy the joints are to reach
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
What we need to know
What to tell us when you ask for a quote:
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Sort the mastic before the decorators arrive
- Inspect the joints round the windows every year or so
- Leave the new mastic unpainted
- Keep modern sealant off the mastic
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.
What sand mastic looks like in Great Missenden
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. With historic houses such as Hughenden Manor (about 4.2 miles south-west) nearby, there’s older building stock in the area around Great Missenden as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
In the older streets around Church of Saints Peter and Paul, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Great Missenden CofE Combined School? Then the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Great Missenden station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Great Missenden is about 4 miles west of Chesham, in Buckinghamshire. Our applicators cover sand mastic for householders, landlords and businesses in Great Missenden, as part of our work across Buckinghamshire. Great Missenden is one of 263 towns and villages in Buckinghamshire where we work for sand mastic. Reading is on our list too, around 21 miles away.
Our applicators cover all of the HP16 postcode area for sand mastic and the streets around it. Local streets include High Street, London Road and Station Approach. If you are just outside Great Missenden, we cover Hunt's Green (2 miles north), Wendover Dean (2 miles north-west), Lee Gate (3 miles north), Great Hampden (3 miles west) and Kingsash (3 miles north). Within a short drive, we also cover Aylesbury (9 miles north-west), High Wycombe (5 miles south), Chesham (4 miles east), Marlow (9 miles south), Amersham (5 miles south-east) and Beaconsfield (7 miles south).
Near you in Great Missenden
We work in homes and buildings around The Cross Keys Public House, Misbourne School and Missenden Abbey Adult Education College, among other places. There’s a railway station in Great Missenden itself: Great Missenden station. Well-known places in the area include Hawridge Court (4.5 miles north-east) and Chiltern Hospital (1.1 miles south-east). Not far away are Coombe Hill and Prestwood Local Nature Reserve.
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Also near Great Missenden
What else we do in Great Missenden
How it works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a single window, longer for several, and the area is left clean. Somewhere like Great Missenden 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 look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Let us know about earlier repairs to the joints
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
Getting 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 and send pictures if you have them.
Related advice
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.