Buckinghamshire · England
Prestwood Sand Mastic
Sand mastic across Prestwood and nearby, with old sealant always removed completely and a 12-month guarantee.
- Modern sealant on a period surround
- Open joints round the window box
- Wind and rain getting in round a sash window
What we can’t put right
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- Putty and glazing repairs
- Sashes that need overhauling
- Planning or listed building consent (your local planning authority decides)
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
Surfaces we seal
- Tenement windows
- Brick reveals
- Period & listed homes
- Sash and case windows
- Timber door frames
- Stone surrounds
About our sand mastic in Prestwood
We renew sand mastic around sash windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. Common call-outs are for cement or filler used on old window joints that has cracked and open joints round the window box, across stone surrounds, period & listed homes and tenement windows.
In smaller places like Prestwood, 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.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Prestwood (HP16)
- Wider area
- Buckinghamshire
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Also near Prestwood
Other services in Prestwood
Prestwood questions
Can you help a landlord with a rental near Great Missenden station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is Prestwood in your area for sand mastic?
Yes. We work across London and the South East, and Prestwood is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
How do I get a quote for sand mastic in Prestwood?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. If you’re redecorating the window, ask us first and we’ll advise.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Can you match the sealant colour?
Yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before any work starts.
What we do, step by step
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours for a single window, longer for several. A visit to Prestwood is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
- Mention if the joints have been sealed before
Ask for a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Avoid heavy scraping on the mastic joint
- Sort the mastic before the decorators arrive
- Leave the new mastic unpainted
- Make sure water runs off the sill
Avoid painting over the new mastic, which is the traditional advice. If you are redecorating, ask us first.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber, which can lead to rot.
Leave it or put it right?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. Around Prestwood, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why choose Mr Mastic in Prestwood
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
- We are fully insured
- Quality sealants from Arbo and Everbuild
Take a look at how sealant jobs are priced and our reviews.
How we quote for sand mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- The product the joint needs
- The number and length of the joints
- Access and height
- Whether old sealant or filler has to be cut out
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Helping us quote
To make quoting easier, let us know:
- Any previous sealing or DIY work
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
- Whether it’s a home or a business
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or send us an email with the details, and pictures are welcome.
Prestwood homes and the weather
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Hughenden Manor (about 3.4 miles south) are a reminder that the area around Prestwood has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you live in an older home near Holy Trinity Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Great Missenden station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Schools such as Prestwood Junior School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Prestwood is about 5 miles north of High Wycombe, in Buckinghamshire. Homes, rented property, offices and hotels in Prestwood can book us for sand mastic. Every job comes with our one-year guarantee. Our area takes in 263 places across Buckinghamshire, large and small. There’s also a page for Reading, about 20 miles away.
Jobs for sand mastic in HP16 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on High Street, Honor Road and Gryms Dyke or anywhere close by, our applicators can take on the job. Other places close to Prestwood include Stony Green (1 mile south-west), Bryant's Bottom (1 mile west), Great Kingshill (2 miles south), Little Kingshill (2 miles south-east) and Upper North Dean (2 miles south-west). Larger places within reach include Aylesbury (9 miles north), High Wycombe (5 miles south), Chesham (5 miles east), Marlow (9 miles south), Amersham (6 miles east) and Beaconsfield (7 miles south-east).
Around Prestwood
Typical jobs here are in homes near Travellers Rest pub, Misbourne School and Missenden Abbey Adult Education College and the streets around them. The closest station to Prestwood is Great Missenden station, roughly 1.2 miles east. Nearby you will also find Roald Dahl Museum and Story Centre (1.3 miles east) and Great Missenden (2.1 miles east). Not far away are Prestwood Local Nature Reserve and Coombe Hill.
Landlord and commercial work in Prestwood
If you manage several properties in or around Prestwood, several properties can go on one quote. Send us the addresses and the work at each.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.