Buckinghamshire · England
Great Kingshill Sand Mastic
We cover Great Kingshill for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
- Mastic that needs renewing before redecorating
FAQs for Great Kingshill
Is Great Kingshill within the area you cover?
Yes, Great Kingshill is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Great Missenden station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Can you match the sealant colour?
We will suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Should I check with the council before work on a listed or conservation-area home?
Your local planning authority is the one to ask. They decide whether consent is needed for work to your windows.
Is the work guaranteed?
Every job comes with our one-year guarantee, and we are fully insured.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Can you do several jobs on one visit?
Yes. Just list everything you need and you will get one quote.
Sand mastic in Great Kingshill
Sand mastic suits most period window surrounds. Newer frames usually get a flexible sealant instead, and we’ll talk through which suits your home. If you have draughty sash windows at the surround and weathered mastic on the most exposed windows, we can help.
Homes in small places like Great Kingshill 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 are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Place
- Great Kingshill (HP15)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Sand mastic in Great Kingshill: local notes
Historic houses like Hughenden Manor (about 2.1 miles south-west) are a reminder that the area around Great Kingshill 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Great Kingshill Church of England Combined School? Then larger buildings have plenty of frames, and the mastic around each one ages. 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 Kingshill is about 3 miles north of High Wycombe, in Buckinghamshire. Wherever you are in the HP15 postcode area, we can carry out sand mastic at your property. Great Kingshill is one of 263 places in Buckinghamshire where we work for sand mastic. Reading is on our list too, around 19 miles away.
We work across the HP15 postcode area for sand mastic and the streets around it. You’ll find streets such as Stag Lane, Fairfields and Common Road, all of which we cover. If you’re just outside Great Kingshill, we cover Cryers Hill (1 mile south), Widmer End (1 mile south-east), Spurlands End (1 mile east), Hughenden Valley (1 mile south-west) and Stony Green (1 mile north-west). We also work in nearby towns such as Aylesbury (11 miles north), High Wycombe (3 miles south), Chesham (6 miles north-east), Marlow (7 miles south), Amersham (5 miles east) and Beaconsfield (6 miles south-east).
What’s near Great Kingshill
Typical jobs here are in homes near Pipers Corner School, The Red Lion pub and Holmer Green Senior School and the streets around them. Great Kingshill’s nearest station is Great Missenden station, roughly 2.1 miles north-east of the centre. Other landmarks nearby include Eden (3.3 miles south) and Great Missenden (2.3 miles north-east). Green spaces nearby include Prestwood Local Nature Reserve.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Towns and villages near Great Kingshill
Also in Great Kingshill
What sealant work cannot fix
In fairness, there are a few things sealant won’t fix:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that need overhauling
- Putty and glazing repairs
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Where we work in Great Kingshill
- Stone surrounds
- Tenement windows
- Sash and case windows
- Brick reveals
- Period & listed homes
- Timber door frames
Surface by surface
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Plan mastic work ahead of painting
- Avoid heavy scraping on the mastic joint
- Do not paint over the new mastic
- Clear gutters so water does not pour onto the windows
Leave the new mastic unpainted, which is the traditional advice. If you’re redecorating, ask us first.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens.
When to call us in Great Kingshill
Previous repairs in cement or silicone often trap water or crack away. They do not suit the joint and we normally remove them.
The problems people usually mention when they call are:
- Wind and rain getting in round a sash window
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Cement or filler used on old window joints that has cracked
If you live in an older home near Church of the Good Shepherd, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before you book anyone
- What guarantee comes with the work
- Which colour the sealant will be
- How long to leave it before use
- Whether the sealant suits the joint
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for a single window, longer for several. Somewhere like Great Kingshill needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- The surface is finished to suit the stone or brick.
Before we arrive
- Mention any tricky access
- Keep children and pets away from the work area
- Let us know about earlier repairs to the joints
How to get a quote
For sand mastic in Great Kingshill, phone 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
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Why it’s worth doing now in Great Kingshill
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad and new mastic seals them. Around Great Kingshill, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Why choose Mr Mastic in Great Kingshill
- Over 20 years’ experience
- Full insurance on every job
- Old sealant always removed completely
- We leave the area clean and tidy
See our cost guide or customer reviews.