Oxfordshire · England
Neithrop Sand Mastic
We cover Neithrop 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.
- Crumbling sand mastic round a window
- A silicone bead on a sash window that spoils the look
- Window mastic to renew ahead of painting
Why act early in Neithrop
If you are redecorating, renew the mastic first. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. In a smaller place like Neithrop, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Why choose Mr Mastic in Neithrop
- Experience in homes, commercial sites and hotels
- Over 20 years’ experience
- Approved under the ARBOMaster scheme
- 180+ five-star Google reviews
See what affects the cost and customer reviews.
Sand mastic in Neithrop
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. If you have draughts and rain around sash boxes and mastic dropping out of the joint, we can put it right.
In smaller places like Neithrop, 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.
You get a one-year guarantee, the same in Neithrop as everywhere else we work.
- Place
- Neithrop (OX16, OX15)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Neithrop 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. With historic houses such as Broughton Castle (about 1.8 miles south-west) nearby, there’s older building stock in the area around Neithrop 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.
If you live in an older home near St Paul's Church Centre, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Banbury station? Then any sash windows need sound mastic to keep draughts and rain out.
Neithrop is about 1 mile west of Banbury, in Oxfordshire. Every kind of property in Neithrop is covered for sand mastic. The work is guaranteed for a year. Neithrop is one of 443 places in Oxfordshire where we work. There’s also a page for Oxford, roughly 22 miles from Neithrop.
Here we cover the OX16 and OX15 postcode area for sand mastic. That includes homes and businesses on Abbey Road, Lunnun Road and Bailey Road. We also cover the places around Neithrop: Ruscote (1 mile north), Banbury (1 mile east), Drayton (1 mile north-west), North Newington (1 mile west) and Broughton (2 miles south-west). Larger places within reach include Bicester (14 miles south-east), Bure Park (14 miles south-east), Chipping Norton (11 miles south-west), Woodstock (15 miles south), Bloxham (3 miles south) and Charlbury (14 miles south).
Landmarks near Neithrop
Around Neithrop, our work takes us to homes and buildings near Drayton School, People's Park and Admiral Holland pub, among other places. The nearest railway station is Banbury station, roughly 1.5 miles east. A little further out are Castle Quay Shopping Centre (1.2 miles east) and Horton General Hospital (1.2 miles east). Not far away are Farthinghoe Nature Reserve and Crouch Hill.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
When to call us in Neithrop
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
Look out for any of the following:
- Draughty sash windows at the surround
- A silicone bead on a sash window that spoils the look
- Patchy fillers round a sash window
- Tired mastic found when preparing windows for paint
Managing a site like St Joseph's Catholic Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- Whether you can choose the colour
- Whether they’re fully insured
- How much experience the applicator has
- How long to leave it before use
What happens on the day
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. The job usually takes a few hours for a single window, longer for several, and we explain the cure time before we leave. In a smaller place like Neithrop, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
How to get a quote
Want a quote for sand mastic? Please call 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear price before work begins.
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What the job involves on each surface
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
More services for Neithrop
Common questions in Neithrop
Do you cover smaller places like Neithrop?
Yes. Neithrop is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Neithrop for sand mastic?
Yes. We work across London and the South East, and Neithrop is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Can you match the sealant colour?
Usually, yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before any work starts.
How long does sand mastic take to harden?
Not right away. The skin forms first, and the full set comes later and we will give you an idea for your job.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
When it isn’t the sealant
Before you book, it’s worth knowing the limits too:
- Sash cords, weights and draught-proofing of the sashes
- Masonry that needs repairing
- Decayed frames that need repair
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Timber door frames
- Brick reveals
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Tenement windows
Landlord and commercial work in Neithrop
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Letting agents and landlords in Neithrop can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.