Hampshire · England
Sand Mastic in Dummer
We cover Dummer for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Draughts and rain around sash boxes
- Weathered mastic on the most exposed windows
- Crumbling sand mastic round a window
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Whether work needs listed building consent
- Broken panes
- Rotten sashes, sills or window boxes (a joiner’s job)
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Surfaces we seal
- Tenement windows
- Sash and case windows
- Timber door frames
- Brick reveals
- Stone surrounds
- Period & listed homes
About our sand mastic in Dummer
On many period windows, sand mastic looks right and suits the building. Newer frames generally get a flexible sealant instead, and we will talk through which suits your home. We work on tenement windows, timber door frames and brick reveals, and the jobs we see most are old sand mastic that has cracked, crumbled or fallen out and wind and rain getting in round a sash window.
Around Dummer, 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.
Each job carries a 12-month guarantee.
- Place
- Dummer (RG25)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Windows and doors in Dummer
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Micheldever station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Dummer is about 4 miles south-west of Basingstoke, in Hampshire. Across the RG25 area, we can carry out sand mastic at your property. We cover 683 towns and villages across Hampshire, from the larger towns to small villages. For nearby work, see our Reading page, about 18 miles away.
Postcode districts we cover here for sand mastic: RG25. Sand mastic is available to properties on Down Street, Post Office Lane and Porters Close and the roads around them. If you’re just outside Dummer, we cover North Waltham (2 miles west), Farleigh Wallop (2 miles east), Kempshott (2 miles north), Hatch Warren (2 miles north-east) and Oakley (3 miles north). Further out, we also cover Basingstoke (4 miles north-east), Winchester (13 miles south-west), Fleet (15 miles east), Andover (14 miles west), Alton (9 miles south-east) and Tadley (10 miles north).
Around Dummer
Locally, jobs take us to homes and businesses close to The Queen Inn and the streets around them. The nearest railway station is Micheldever station, about 4.8 miles south-west of the centre. Other landmarks nearby include Park Prewett Hospital (5 miles north). Not far away are Farleigh Hill.
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
What else we do in Dummer
How it works
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for a single window, longer for several. In a small place like Dummer, access is usually the main thing to plan. 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.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
Get a quote
For a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Read more
When to call us in Dummer
Some old mastic was never deep enough. A thin layer doesn’t hold well so we make sure the new mastic is the right thickness.
Signs it’s time to call us include:
- Gaps round a timber door in stone or brick
- Gaps between timber frames and stone or brick
- Cement or filler used on old window joints that has cracked
- Crumbling sand mastic round a window
If you live in an older home near Church of All Saints, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- Are they insured?
- What happens if the job turns out different
- Whether the sealant suits the joint
- Is VAT in the price?
Why it’s worth doing now in Dummer
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. In a small place like Dummer, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Dummer
- More than 20 years in sealant work
- Full insurance on every job
- Rated 4.9 stars on Google
- Approved under the ARBOMaster scheme
Take a look at our cost guide and our reviews.
How the job changes by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside so we finish it carefully.
Stone surrounds
We take care not to mark the stone while raking out the old mastic.
Dummer questions
Is Dummer in your area for sand mastic?
Yes. Our work covers London and the South East, and Dummer is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll send you a clear quote.
Do you cover smaller places like Dummer?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Can new sealant go over the old?
No. We remove every bit of old sealant first.
What 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.
What affects the cost of sand mastic
The price is agreed before any work begins. It’s based on:
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- Access and height
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
What to tell us for a quote
Before you ask for a quote, have a think about:
- How many joints, rooms or windows are involved
- Photos by email, if that is easy
- Where the job is, and your postcode
- If someone has resealed it before
We don’t publish a price list. Instead, we give you a clear quote for your job. To arrange one, phone 0345 464 0079 or email us.