Oxfordshire · England
Sand mastic for sash & case windows in Henwood, Oxfordshire
We cover Henwood for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Gaps round a timber door in stone or brick
- Mastic dropping out of the joint
- Draughts and rain around sash boxes
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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 for homes and businesses in Henwood
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. We work on brick reveals, timber door frames and stone surrounds, and the jobs we see most are draughty sash windows at the surround and patchy fillers round a sash window.
Around Henwood, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- Henwood (OX1)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Henwood
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Also near Henwood
More services for Henwood
The process
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours per window, depending on the condition of the joints. Somewhere as small as Henwood, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
Getting ready for the visit
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
How to get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work and send you a clear quote.
Advice
Your questions about sand mastic in Henwood
I let a flat near Oxford station. Can you help?
Yes. We work for letting agents and landlords as well as householders. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Do you cover Henwood for sand mastic?
Yes. We work across London and the South East, and Henwood is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Are you fully insured?
Yes. Full insurance covers our work.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Where are you based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They’ll tell you if consent is needed for work to your windows.
Leave it or put it right?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic suits the building and blends with the stone or brick. Where a wall is exposed, as many are in small places like Henwood, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Why Henwood customers choose us
- Old sealant always removed completely
- Over 20 years’ experience
- Trusted Arbo and Everbuild sealants
- A 12-month guarantee on all work
Read how sealant jobs are priced and customer reviews.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Look over the window mastic once a year
- Get any rot dealt with first
- Sort the mastic before the decorators arrive
- Don’t run silicone over sand mastic
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
How we quote for sand mastic
Call for a quick quote. The main things that affect it are:
- The number and length of the joints
- The type of sealant required
- Any working-time requirements on site
- Any mould that needs treating
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Asking for a quote
You don’t need to know the technical terms. Just tell us:
- Roughly how big the job is
- Whether it has been sealed before
- Where the job is, and your postcode
- The type of property
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To arrange one, phone 0345 464 0079 or drop us an email.
How the job changes by surface
Period and listed homes
A traditional finish suits a period property.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
What sand mastic looks like in Henwood
Historic houses like Appleton Manor (about 1.7 miles west) are a reminder that the area around Henwood has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Church of St Peter include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Oxford station, any sash windows need sound mastic to keep draughts and rain out. For site and facilities teams at buildings such as Wootton St Peter's Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Henwood is about 3 miles north-west of Abingdon-on-Thames, in Oxfordshire. Henwood gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 443 towns and villages across Oxfordshire, from the larger towns to small villages.
Work in OX1 works the same way as everywhere else we cover. Local streets include Cumnor Road, Hill View Lane and White Hill Lane. Neighbouring places we cover for sand mastic include Wootton (1 mile south), Cumnor (1 mile north-west), Chawley (1 mile north), Appleton (2 miles west) and Dean Court (2 miles north). Further out, we also cover Oxford (5 miles north-east), Didcot (8 miles south-east), Bicester (15 miles north-east), Abingdon-on-Thames (3 miles south-east), Witney (9 miles north-west) and Carterton (12 miles west).
Landmarks near Henwood
Typical jobs here are in homes near Matthew Arnold School and The Bystander pub, among other places. The closest station to Henwood is Oxford station, roughly 3.4 miles north-east of the centre. A little further out are Westgate Shopping Centre (3.5 miles north-east) and The Story Museum (3.6 miles north-east). The countryside around Henwood includes Cumnor Hill and Lashford Lane Fen.