Oxfordshire · England
Dean Court Sand Mastic
We cover Dean Court for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Crumbling sand mastic round a window
- Old cement repairs round a window that have failed
- Gaps round a timber door in stone or brick
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Sand mastic in Dean Court
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, and new mastic is applied and shaped by hand. We’re often asked to deal with tired mastic found when preparing windows for paint and a silicone bead on a sash window that spoils the look, across sash and case windows, timber door frames and tenement windows.
Around Dean Court, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows.
You get a one-year guarantee, the same in Dean Court as everywhere else we work.
- Location
- Dean Court (OX2)
- Wider area
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of sand mastic
For a quick quote, just ask. The main things that affect it are:
- Whether the work is at height
- Mould in or behind the old joints
- Working hours on commercial sites
- Whether old sealant or filler has to be cut out
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear price before work begins.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- A few pictures by email, if you can
- Where the job is, and your postcode
- Whether it’s a home or a business
- The problem you’ve noticed
Want a quote for sand mastic? Please ring 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
More services for Dean Court
Work for landlords, hotels and businesses
We also work for property managers and facilities teams. Several sites can be quoted together.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Surface by surface
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we’ll confirm what’s needed.
Dean Court questions
Do you work for landlords with property near Oxford station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover Dean Court for sand mastic?
Yes. Our work covers London and the South East, and Dean Court is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Will there be a smell?
There can be a smell while the sealant cures. Ventilation helps.
How long does sand mastic take to go off?
A skin forms quite soon, but full hardening takes longer. We will tell you what to expect for your job.
What happens on the day
Every visit runs the same way: we check the joints, protect the area around them, do the work and clear up. It generally takes anything from a few hours to a full day, depending on how many windows. For a job in Dean Court, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- 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.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
Getting a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll take it from there.
Related advice
When to call us in Dean Court
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
Keep an eye out for these signs:
- Silicone on a period window that looks wrong
- Open joints round the window box
- Failed mastic on an exposed elevation
- Mastic round period door frames that has failed
Letting a property close to Oxford station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Comparing quotes
- What preparation is included
- Whether you can choose the colour
- How long to leave it before use
- How long the guarantee is
Frames and glazing around Dean Court
With historic houses such as Holywell Manor (about 2.7 miles east) nearby, there’s older building stock in the area around Dean Court as well as newer homes. 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near St Andrew's, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Matthew Arnold School? Then its window and door frames need their mastic kept sound, just like a home’s.
Dean Court is about 3 miles west of Oxford, in Oxfordshire. Our applicators cover sand mastic for homes and businesses in Dean Court. We cover 443 towns and villages across Oxfordshire, from the larger towns to small villages.
Every address in OX2 is within our area for sand mastic, from the main roads to the quietest streets. Whether your property is on Green Lane, Hazel Road and Poplar Road or anywhere close by, we can help. If you are just outside Dean Court, we cover Botley (1 mile east), Chawley (1 mile south-west), Filchampstead (1 mile west), Cumnor (2 miles south-west) and Farmoor (2 miles north-west). We also work in nearby towns such as Oxford (3 miles east), Didcot (10 miles south), Bicester (12 miles north-east), Abingdon-on-Thames (5 miles south), Witney (8 miles west) and Carterton (12 miles west).
Landmarks near Dean Court
In Dean Court, that means homes and buildings near The Seacourt Bridge pub, Raleigh Park and Botley School and the streets around them. The nearest railway station is Oxford station, roughly 1.7 miles east of the centre. Nearby you’ll also find Radcliffe Infirmary (2.2 miles east) and Oxford University Press Museum (2 miles east). Open spaces near Dean Court include Harcourt Hill and Hook Meadow and The Trap Grounds.
Why act early in Dean Court
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and blends with the stone or brick. Around Dean Court, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
What it costs depends on how much there is to do, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why Dean Court customers choose us
- A 12-month guarantee on all work
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
- We never seal over old sealant
Read our cost guide or customer reviews.