Buckinghamshire · England
North Marston Sand Mastic
Professional sand mastic in and around North Marston, with old sealant always removed completely and a 12-month guarantee.
- Modern sealant on a period surround
- Weathered mastic on the most exposed windows
- Open joints round the window box
Sand mastic in North Marston
Silicone on a period window often looks wrong and does not suit the building. Sand mastic is the traditional choice and we can swap the silicone for it. We work on stone surrounds, tenement windows and timber door frames, and the jobs we see most are weathered mastic on the most exposed windows and draughty sash windows at the surround.
Outdoor sealant needs dry, clean surfaces, so work on frames around North Marston is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Every job comes with a 12-month guarantee, wherever you are in Buckinghamshire.
- Location
- North Marston (MK18)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. The work normally takes a few hours for a single window, longer for several. Somewhere as small as North Marston, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Tell us if parking is tricky
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
Getting a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or send us an email.
Related advice
Frames and glazing around North Marston
With historic houses such as Claydon House (about 3.8 miles north-west) nearby, there’s older building stock in the area around North Marston 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’s traditional sand mastic. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Aylesbury Vale Parkway station, cracked sand mastic around sash windows lets in the draughts tenants complain about. In the older streets around Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as North Marston Church of England School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
North Marston is about 6 miles north-west of Aylesbury, in Buckinghamshire. For sand mastic in and around North Marston, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Buckinghamshire from our Crawley base. 263 places in Buckinghamshire are on our list, from the larger towns to small villages. You can also see our page for Oxford, about 18 miles away.
Work in MK18 works the same way as everywhere else we cover. You’ll find streets such as High Street, Elmers Meadow and Dudley Close. If you’re just outside North Marston, we cover Oving (1 mile south-east), Pitchcott (1 mile south), Whitchurch (2 miles south-east), Hardwick (3 miles south-east) and Weedon (4 miles south-east). Further out, we also cover Aylesbury (6 miles south-east), Buckingham (8 miles north-west), Elmhurst (6 miles south-east), Southcourt (7 miles south), Princes Risborough (12 miles south) and Haydon Hill (5 miles south).
Landmarks near North Marston
Locally, jobs take us to homes and businesses close to The Pilgrim pub and the streets around them. For rail, the closest station is Aylesbury Vale Parkway station, about 4.7 miles south of the centre. Well-known places in the area include Bolbec Castle (2 miles south-east) and Royal Buckinghamshire Hospital (5.9 miles south-east).
Leave it or put it right?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Around North Marston, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why book with us
- One-year guarantee on every job
- Tidy, careful work
- Quality sealants from Arbo and Everbuild
- Anti-fungal silicone where joints get wet
Read our cost guide and what customers say.
For landlords and businesses
For anyone letting property in or around North Marston, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
How the job changes by surface
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Towns and villages near North Marston
What else we do in North Marston
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- The number and length of the joints
- Access and height
- Mould in or behind the old joints
- How much old sealant there is and how hard it is to remove
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
What to tell us for a quote
When you contact us, these details help:
- Where the property is
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- If it’s domestic, commercial or a hotel
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Aftercare tips
So the new joints stay in good condition:
- Do not paint over the new mastic
- Avoid heavy scraping on the mastic joint
- Have rotten timber repaired before new mastic goes in
- Avoid patching sand mastic with silicone
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
North Marston questions
Can you help a landlord with a rental near Aylesbury Vale Parkway station?
Yes, we work for landlords and letting agents. 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 we start.
Is North Marston within the area you cover?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can I paint the new mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Should I use sand mastic or silicone?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames usually get a flexible sealant.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or email us.