Hampshire · England
Sand mastic for sash & case windows in South Wonston, Hampshire
Professional sand mastic in and around South Wonston, with old sealant always removed completely and a one-year guarantee.
- Tired mastic found when preparing windows for paint
- Weathered mastic on the most exposed windows
- Draughts and rain around sash boxes
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Sash cords, weights and draught-proofing of the sashes
- Planning or listed building consent (your local planning authority decides)
- Timber that has rotted
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think before you book.
Joints and surfaces we work on
- Brick reveals
- Tenement windows
- Timber door frames
- Period & listed homes
- Sash and case windows
- Stone surrounds
How we handle sand mastic in South Wonston
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. Typical jobs include old cement repairs round a window that have failed and mastic worn away on windows facing the weather, on stone surrounds, sash and case windows and timber door frames.
Around South Wonston, 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.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Where
- South Wonston (SO21)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Frames and glazing around South Wonston
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as South Wonston Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Winchester station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
South Wonston is about 4 miles north of Winchester, in Hampshire. From the centre of South Wonston to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Hampshire coverage runs to 683 places, South Wonston among them. For nearby work, see our Southampton page, about 14 miles away.
Work in SO21 works the same way as everywhere else we cover. Local streets include Norris Gardens, Wrights Way and Lovell Close, and we cover them all. Neighbouring places we cover for sand mastic include Worthy Down (1 mile south), Springvale (2 miles south-east), Sutton Scotney (2 miles north), Stoke Charity (2 miles north-east) and Hunton (3 miles north). Within a short drive, we also cover Basingstoke (14 miles north-east), Winchester (4 miles south), Eastleigh (11 miles south), Andover (9 miles north-west), Chandler's Ford (10 miles south) and Alton (15 miles east).
What’s near South Wonston
For rail, the closest station is Winchester station, roughly 3.7 miles south of the centre. Other landmarks nearby include Royal Hampshire County Hospital (4 miles south) and Winchester Castle (4.1 miles south). Not far away are Winnall Moors.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. 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.
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
South Wonston: your questions answered
Can you do sand mastic in South Wonston?
Yes, South Wonston is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
I let a flat near Winchester station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
How long will you be here?
It depends on the size of the job, but as a guide it takes anything from a few hours to a full day, depending on how many windows. We will give you a better idea when we quote.
Where are you based?
Our base is in Crawley, and we work across South East England, London and Scotland.
What is sand mastic?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses.
What happens if it’s left?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. Around South Wonston, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or email us and we’ll talk you through it.
What you get with us
- Tidy, careful work
- Anti-fungal sanitary silicone in wet areas
- 20+ years of sealant experience
- Homes, businesses and hotels
Nearby places to South Wonston
More services for South Wonston
How the visit works
Most of a good job is in the preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours per window, depending on the condition of the joints. In a small place like South Wonston, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- The surface is finished to suit the stone or brick.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
- Keep children and pets away from the work area
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Advice
Do you need sand mastic in South Wonston?
Timber swells and shrinks with the weather. The movement cracks the mastic over time.
Look out for these signs:
- Cracked mastic round a front door frame
- Mastic worn away on windows facing the weather
- Modern sealant on a period surround
- Draughts and rain around sash boxes
If you live in an older home near St Margaret's, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- Whether the sealant suits the joint
- When the joint can take water or movement
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
What affects the cost of sand mastic
Call for a quick quote. The main things that affect it are:
- The number of rooms or windows
- When we can work, for business premises
- Whether the work is at height
- Mould in or behind the old joints
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- Photos by email, if that’s easy
- Roughly how big the job is
- If someone has resealed it before
- Where the property is
For sand mastic in South Wonston, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.