Oxfordshire · England
Sand mastic for sash & case windows in Hardwick, Oxfordshire
Sand mastic for Hardwick and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Old cement repairs round a window that have failed
- Old sand mastic that has cracked, crumbled or fallen out
- Tired mastic found when preparing windows for paint
About our sand mastic in Hardwick
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. We work on period & listed homes, tenement windows and sash and case windows, and the jobs we see most are weathered mastic on the most exposed windows and wind and rain getting in round a sash window.
Outdoor sealant needs dry, clean surfaces, so work on frames around Hardwick is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Hardwick (OX27)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Hardwick homes and the weather
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.
In the older streets around Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Hardwick is about 4 miles north of Bicester, in Oxfordshire. If you need sand mastic in Hardwick, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Oxfordshire from our Crawley base, Hardwick included. 443 places in Oxfordshire are on our list, from the larger towns to small villages. For nearby work, see our Oxford page.
We cover every part of OX27 for sand mastic and the streets around it. If you’re just outside Hardwick, we cover Hethe (1 mile east), Stoke Lyne (1 mile south-west), Fringford (2 miles east), Bucknell (3 miles south-west) and Stratton Audley (3 miles south-east). Within a short drive, we also cover Oxford (15 miles south), Banbury (10 miles north-west), Bicester (4 miles south), Kidlington (11 miles south-west), Headington Quarry (14 miles south) and Bure Park (4 miles south).
Local landmarks in Hardwick
In Hardwick, that means homes and buildings near Whitmore Arms Public House. For rail, the closest station is Bicester North station, about 4.2 miles south. Well-known places in the area include Ardley Castle (2.8 miles south-west) and Bicester Community Hospital (4.6 miles south).
Signs you need sand mastic in Hardwick
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
The problems people normally mention when they call include:
- Tired mastic found when preparing windows for paint
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
- Wind and rain getting in round a sash window
For landlords with property near Bicester North station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Before booking anyone
- What the quote includes, VAT included or not
- The length of the guarantee
- Whether they seal over old material or remove it
- Whether you can choose the colour
Common questions in Hardwick
Will you come out to Hardwick?
Yes, we do. Our work covers 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 Bicester North station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Which is right for my windows, sand mastic or modern sealant?
We’ll talk it through with you. Sand mastic suits many period homes and newer frames suit modern sealant.
Can I add another job to the visit?
Yes. Just list everything you need.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
When will the new mastic be hard?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Can you replace silicone on a period window with sand mastic?
Often, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Hardwick and across Oxfordshire. Several sites can go on one quote, and we’re fully insured.
We work for letting agents and landlords as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Why it’s worth doing now in Hardwick
Not every filler suits an old window 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 Hardwick, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Why choose Mr Mastic in Hardwick
- Tidy, careful work
- We are fully insured
- ARBOMaster approved applicator
- Domestic, commercial and hotel work
See our cost guide or customer reviews.
What affects the quote in Hardwick
We do not publish a price list, because jobs vary so much. What we look at:
- How much there is to do
- How many rooms, windows or areas are involved
- Access and height
- Whether there’s mould to deal with
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What to tell us for a quote
To make quoting easier, let us know:
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- The rough size of the job
- If someone has resealed it before
Want a quote for sand mastic? Please phone 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear price before work begins.
What sealant work cannot fix
Before you book, it’s worth knowing the limits too:
- Masonry that needs repairing
- Broken panes
- Planning or listed building consent (your local planning authority decides)
If you are not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Brick reveals
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Timber door frames
- Tenement windows
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself normally takes a few hours per window, depending on the condition of the joints, depending on how much there is to do. For a village or hamlet like Hardwick, 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.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
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DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.