Oxfordshire · England
Sand mastic for sash & case windows in Northend, Oxfordshire
Problem with your window and door surrounds in Northend? We remove the old material, prepare the joints and seal them properly.
- Weathered mastic on the most exposed windows
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
Sand mastic in Northend
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. We work on sash and case windows, timber door frames and brick reveals, and the jobs we see most are mastic worn away on windows facing the weather and patchy fillers round a sash window.
Somewhere as small as Northend, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Northend (RG9)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. Around Northend, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
- Sanitary silicone with an anti-fungal additive in wet areas
- Tidy, careful work
Take a look at our cost guide and our reviews.
How the visit works
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to a full day, depending on how many windows, including the tidy-up. For a village or hamlet like Northend, 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 look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Mention any sign-in or site rules at work premises
- Clear the area around the work
- Plan for the work area to be out of bounds to pets and children
How to get a quote
Need a quote? Please phone 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before we start.
Advice
Different surfaces, different methods
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Common questions in Northend
Is Northend in your area for sand mastic?
Yes. Our work covers London and the South East, and Northend is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear price.
Is there a guarantee on sand mastic in Northend?
All our work, in Northend and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
When will the new mastic be hard?
It takes a while. The skin forms first, and the full set comes later, and we will tell you what to expect.
How do I get a quote for sand mastic in Northend?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Quotes for sand mastic in Northend
We don’t publish a price list, because jobs vary so much. What we look at:
- The type of sealant required
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
- Mould in or behind the old joints
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, call 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- Where the job is, and your postcode
- Any access issues, like height or stairs
- Photos by email, if that is easy
- Roughly how big the job is
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or email us.
Towns and villages near Northend
What else we do in Northend
Work for landlords, hotels and businesses
If you manage several properties in or around Northend, several properties can go on one quote. Send us the addresses and the work at each.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Windows and doors in Northend
Historic houses like Stonor Park (about 2.1 miles south) are a reminder that the area around Northend 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. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Around Northend, as everywhere, sand mastic is only as good as the preparation behind it. Historic houses such as Stonor Park, about 2.1 miles south, show how far back building around Northend goes, and older homes nearby need a sealant that suits their walls.
Northend is about 8 miles north-west of Marlow, in Oxfordshire. Every kind of property in Northend can book us for sand mastic. Every job comes with our 12-month guarantee. Across Oxfordshire, we cover 443 places, Northend among them. Reading is on our list too, about 12 miles from Northend.
Here we cover the RG9 postcode area for sand mastic. Other places close to Northend include Christmas Common (1 mile west), Turville Heath (1 mile south-east), Ibstone (1 mile north-east), Stonor (2 miles south) and Howe Hill (2 miles west). We also work in nearby towns such as Oxford (15 miles north-west), Didcot (13 miles west), Abingdon-on-Thames (15 miles west), Thame (8 miles north), Henley-on-Thames (7 miles south) and Benson (7 miles west).
Around Northend
Open spaces near Northend include Bald Hill and Aston Rowant NNR.
Honest limits
We’d rather tell you now than do work that will not last, so these are the limits:
- Planning or listed building consent (your local planning authority decides)
- Masonry that needs repairing
- Sashes that rattle, stick or won’t open
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Period & listed homes
- Stone surrounds
- Brick reveals
- Timber door frames
- Sash and case windows
- Tenement windows