Buckinghamshire · England
Sand mastic for sash & case windows in Coombe, Buckinghamshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Coombe, backed by a 12-month guarantee. Call for a quick quote.
- Mastic round period door frames that has failed
- Gaps where the frame meets the masonry
- Mastic dropping out of the joint
Why act early in Coombe
Cement-based fillers and modern sealants do not always suit a period surround. Sand mastic is the like-for-like choice and that can be important for listed homes. Where a wall is exposed, as many are in small places like Coombe, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Doing several joints on one visit generally makes better use of the time than several visits. We will give you a clear price for the lot.
Why book with us
- 20+ years of sealant experience
- We leave the area clean and tidy
- Sanitary silicone with an anti-fungal additive in wet areas
- 180+ five-star Google reviews
Take a look at how sealant jobs are priced or customer reviews.
Sand mastic in Coombe, 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’re often asked to deal with draughts and rain around sash boxes and open joints round the window box, on tenement windows, period & listed homes and sash and case windows.
Around Coombe, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Coombe (HP17)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Coombe, the journey is planned in advance: 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.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
- Tell us about any water getting in
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Advice
Frames and glazing around Coombe
Compared with the north and west, the South East gets less rain, 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 Peter and St Paul, the joint between an old wall and a newer frame is usually the first place rain gets in. If you let a flat or house near Little Kimble station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Coombe is about 5 miles south of Aylesbury, in Buckinghamshire. If you need sand mastic in Coombe, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We’re based in Crawley and cover Buckinghamshire, Coombe included. Coombe is one of 263 places in Buckinghamshire we cover. Our Oxford page covers work nearby (19 miles or so).
Work in HP17 works the same way as everywhere else we cover. We also cover the places around Coombe: Butler's Cross (1 mile north), Ellesborough (1 mile north-west), Chalkshire (1 mile north), Terrick (1 mile north) and Nash Lee (1 mile north). Within a short drive, we also cover Aylesbury (5 miles north), High Wycombe (8 miles south), Chesham (8 miles east), Marlow (12 miles south), Amersham (9 miles south-east) and Beaconsfield (11 miles south-east).
Near you in Coombe
Locally, jobs take us to homes and businesses close to John Colet School and The Russell Arms and the streets around them. The closest station to Coombe is Little Kimble station, roughly 1.3 miles west of the centre. Other landmarks nearby include Little Kimble Motte (1 mile west) and Trenchard Museum (3.1 miles north-east). Open spaces near Coombe include Brush Hill Local Nature Reserve and Coombe Hill.
Do you need sand mastic in Coombe?
Some old mastic was never deep enough. A thin layer does not hold well so we make sure the new mastic is the right thickness.
The most common problems we see are:
- Cement or filler used on old window joints that has cracked
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
- Gaps where the frame meets the masonry
Managing a site like Great Kimble Church of England School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- When the joint can take water or movement
- Whether they seal over old material or remove it
- What preparation is included
- Whether VAT is included
FAQs for Coombe
Will you come out to Coombe?
Yes, Coombe is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you work for landlords with property near Little Kimble station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Do you have insurance?
Yes. We’re fully insured, and we can confirm the details when we quote.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or send us an email.
How long does sand mastic take?
That depends on how much there is to do, but most jobs take anything from a few hours to a full day, depending on how many windows. We’ll give you a better idea when we quote.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Can I choose the sealant colour?
Yes. White, clear and grey are common, and other colours are available for many products, and we agree the colour with you before work begins.
What sealant work can’t fix
To be straight with you, some problems need a different trade:
- Broken panes
- Decayed frames that need repair
- Planning or listed building consent (your local planning authority decides)
If you’re not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
What we seal
- Period & listed homes
- Brick reveals
- Timber door frames
- Tenement windows
- Stone surrounds
- Sash and case windows
Surface by surface
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. The method is the same as for windows.
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Landlord and commercial work in Coombe
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Towns and villages near Coombe
Other services in Coombe
What affects the quote in Coombe
We quote each job individually. This is what makes a difference:
- Mould in or behind the old joints
- How easy the joints are to reach
- The number and length of the joints
- When we can work, for business premises
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Photos by email, if that is easy
- Access, such as stairs, a lift or height
- The type of property
- Where the job is, and your postcode
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and send you a clear quote before work begins.