Oxfordshire · England
Sand mastic for sash & case windows in Netherton, Oxfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Netherton. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Draughty sash windows at the surround
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
Why it’s worth doing now in Netherton
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in, and renewing the mastic closes them. Where a wall is exposed, as many are in small places like Netherton, 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: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Why book with us
- Approved under the ARBOMaster scheme
- We leave the area clean and tidy
- Arbo and Everbuild products
- We are fully insured
Read what affects the cost or what customers say.
Sand mastic for homes and businesses in Netherton
Sand mastic does not last for ever, leaving gaps round the window. We rake it out and renew it and tidies the surround. We are often asked to deal with old sand mastic that has cracked, crumbled or fallen out and failed mastic on an exposed elevation, on stone surrounds, period & listed homes and timber door frames.
Mastic can only go onto a dry, clean joint, so window work in Netherton is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Where
- Netherton (OX13)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
The work is kept neat and contained to the area we are working on, so you can carry on as normal. Expect the work to take a few hours for a single window, longer for several, and we explain the cure time before we leave. For a village or hamlet like Netherton, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- 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
- Tell us about any water getting in
- Clear the area around the work
- Let us know about earlier repairs to the joints
Getting a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we’ll take it from there.
Related advice
DIY versus a professional finish
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Leave the new mastic unpainted
- Clear gutters so water does not pour onto the windows
- Ask the planning authority about consent for listed or conservation-area homes
- Plan mastic work ahead of painting
Don’t run silicone over the new mastic. If anything cracks, get it looked at before trying a quick fix.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
FAQs for Netherton
Is Netherton in your area for sand mastic?
Yes. We work across London and the South East, and Netherton is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear quote.
Is sand mastic in Netherton guaranteed?
All our work, in Netherton and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Where is Mr Mastic based?
We work from Crawley. We cover Netherton and the rest of Oxfordshire, along with the rest of our area.
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 modern sealants suit newer frames.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Netherton 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. With historic houses such as Appleton Manor (about 2 miles north-east) nearby, there’s older building stock in the area around Netherton as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Church of St Nicholas, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Netherton is about 5 miles west of Abingdon-on-Thames, in Oxfordshire. Every kind of property in Netherton can book us for sand mastic. The work is guaranteed for a year. 443 places in Oxfordshire are on our list, from the larger towns to small villages. You can also see our page for Oxford, roughly 8 miles from Netherton.
Jobs for sand mastic in OX13 is quoted and booked the same way as anywhere else. Close by, we work in Fyfield (1 mile south-east), Tubney (1 mile east), Frilford Heath (2 miles east), Frilford (2 miles south-east) and Cothill (3 miles east). Within a short drive, we also cover Oxford (8 miles north-east), Didcot (8 miles south-east), Abingdon-on-Thames (5 miles east), Witney (8 miles north-west), Carterton (10 miles north-west) and Wantage (7 miles south).
What’s near Netherton
Around Netherton, our work takes us to homes and buildings near The White Hart Inn, among other places. Other landmarks nearby include Hinton Waldrist Castle (2.7 miles west) and Abingdon Community Hospital (4.2 miles east). For a walk, there’s Hitchcopse Pit and Cumnor Hill.
What the job involves on each surface
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
Common problems we fix in Netherton
Timber frames move with the seasons. The movement cracks the mastic little by little.
Signs it’s time to call us include:
- Gaps where the frame meets the masonry
- Cement or filler used on old window joints that has cracked
- Mastic worn away on windows facing the weather
- Silicone on a period window that looks wrong
If you look after a building such as John Blandy Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before booking
- Whether the sealant suits the joint
- What guarantee comes with the work
- Are they insured?
- Whether VAT is included
Nearby places to Netherton
More services for Netherton
What sealant work cannot fix
We will always be straight with you, so here’s what new sealant will not do:
- Whether work needs listed building consent
- Broken panes
- Timber that has rotted
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Brick reveals
- Tenement windows
- Timber door frames
- Period & listed homes
- Stone surrounds
- Sash and case windows