Hampshire · England
Sand Mastic in Dunbridge
Sand mastic across Dunbridge and nearby, with old sealant always removed completely and a one-year guarantee.
- Mastic dropping out of the joint
- Mastic worn away on windows facing the weather
- Tired mastic found when preparing windows for paint
Sand mastic in Dunbridge, done properly
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap so the surround looks right again. Common call-outs are for mastic worn away on windows facing the weather and old sand mastic that has cracked, crumbled or fallen out, across stone surrounds, timber door frames and period & listed homes.
Around Dunbridge, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Our work is backed for twelve months, in Dunbridge and everywhere else we cover.
- Place
- Dunbridge (SO51)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Dunbridge 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 Mottisfont Abbey (about 0.7 miles north-east) nearby, there’s older building stock in the area around Dunbridge 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 is traditional sand mastic.
If you live in an older home near Church of St Andrew, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Mottisfont & Dunbridge station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Dunbridge is about 4 miles north-west of Romsey, in Hampshire. Wherever you are in the SO51 postcode area, our applicators can take on sand mastic. Dunbridge is one of 683 places in Hampshire where we work. Our Southampton page covers work nearby (10 miles or so).
We cover every part of SO51 for sand mastic and the streets around it. If you’re just outside Dunbridge, we cover Mottisfont (1 mile north-east), Kimbridge (1 mile south-east), Stonymarsh (1 mile north-east), Carter's Clay (1 mile south-west) and Lockerley (1 mile west). Larger places within reach include Winchester (10 miles east), Eastleigh (10 miles south-east), Andover (13 miles north), Totton (8 miles south), Chandler's Ford (8 miles south-east) and Hedge End (13 miles south-east).
Landmarks near Dunbridge
Typical jobs here are in homes near The Bear And Ragged Staff Public House and the streets around them. Dunbridge has its own railway station: Mottisfont & Dunbridge station. Other landmarks nearby include Romsey Community Hospital (3.9 miles south-east) and King Johns House (3.5 miles south-east).
Different surfaces, different methods
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Timber door frames
Round a period front door, sand mastic gives the right look.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Get any rot dealt with first
- Keep modern sealant off the mastic
- Leave the new mastic unpainted
- Avoid heavy scraping on the mastic joint
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Landlord and commercial work in Dunbridge
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
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.
The process
We keep the work tidy and contained to the joints we are treating. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we explain the cure time before we leave. Somewhere as small as Dunbridge, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- 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.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Mention any tricky access
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
Ask for a quote
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, call 0345 464 0079 or send us an email.
Advice
What sealant work cannot fix
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Decayed frames that need repair
- Decisions on consent for listed homes
- Sashes that need overhauling
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Sash and case windows
- Brick reveals
- Tenement windows
- Timber door frames
- Stone surrounds
- Period & listed homes
Questions from Dunbridge
I let a flat near Mottisfont & Dunbridge station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Do you cover Dunbridge for sand mastic?
Yes, Dunbridge is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
Is it worth trying 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 you match the sealant colour?
We’ll suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Dunbridge, along with the rest of our area.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later and we’ll give you an idea for your job.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you are redecorating the window, ask us first and we will talk you through it.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
When to call us in Dunbridge
Over the years, sand mastic weathers. It dries out, cracks and loses its grip from the frame or the masonry.
People usually contact us when they notice one of these:
- Failed mastic on an exposed elevation
- A silicone bead on a sash window that spoils the look
- Patchy fillers round a sash window
- Open joints round the window box
If you look after a building such as Awbridge Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Before booking anyone
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
- How long to leave it before use
- What happens if they find a problem under the old sealant