Hampshire · England
Dean Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Dean, with a one-year guarantee on every job. Ask us for a quote.
- Failed mastic on an exposed elevation
- Modern sealant on a period surround
- Mastic that needs renewing before redecorating
How we handle sand mastic in Dean
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. We work on timber door frames, brick reveals and stone surrounds, and people most often call us about cracked mastic round a front door frame and draughts and rain around sash boxes.
Somewhere as small as Dean, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Each job carries a 12-month guarantee, large or small.
- Location
- Dean (SO32)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Dean questions
Can you do sand mastic in Dean?
Yes, Dean is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Do you work for landlords with property near Botley station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
What information do you need?
Let us know what needs doing and where, with pictures by email if possible. If we need more, we’ll ask.
Do you have insurance?
Yes, we’re fully insured for domestic and commercial work.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you offer different sealant colours?
Yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before work begins.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish, but they decide.
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Avoid patching sand mastic with silicone
- Ask the planning authority about consent for listed or conservation-area homes
- Ask us before painting near the mastic
- Go gently near the mastic when preparing windows
Leave the new mastic unpainted, as traditional guidance advises. If you’re redecorating, ask us first.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Quotes for sand mastic in Dean
There’s no set price list, because no two jobs are the same. What we look at:
- How many areas need sealing
- Any working-time requirements on site
- The number and length of the joints
- Whether old sealant or filler has to be cut out
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, phone 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Other services in Dean
What happens if it’s left?
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. In a small place like Dean, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or email us.
Why Dean customers choose us
- ARBOMaster approved applicator
- 180+ five-star Google reviews
- Arbo and Everbuild products
- Over 20 years’ experience
Take a look at what affects the cost or customer reviews.
The process
When we arrive, we look over the joints with you first. We protect the surfaces around the joints before we start. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere like Dean needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Mention any tricky access
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
How to get a quote
To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Advice
Can I do it myself?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Honest limits
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Masonry that needs repairing
- Putty and glazing repairs
- Whether work needs listed building consent
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before you book.
Joints and surfaces we work on
- Stone surrounds
- Tenement windows
- Period & listed homes
- Brick reveals
- Sash and case windows
- Timber door frames
Frames and glazing around Dean
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.
For landlords with property near Botley station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you look after a building such as Bishops Waltham Infant School, larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around Church of St Peter, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Dean is about 6 miles north-east of Hedge End, in Hampshire. If you need sand mastic in Dean, please call 0345 464 0079 or drop us an email for a quick quote. We are based in Crawley and cover Hampshire, Dean included. Dean is one of 683 places in Hampshire we cover for sand mastic. You can also see our page for Southampton, roughly 9 miles from Dean.
All of SO32 is covered for sand mastic. Local streets include Dean Lane, Little Ashton Lane and Limekiln Lane, and we cover them all. We also cover the places around Dean: The Hangers (1 mile east), Upper Swanmore (2 miles south-east), Swanmore (2 miles south), Hill Grove (2 miles south-east) and Droxford (3 miles east). Larger places within reach include Winchester (8 miles north-west), Gosport (12 miles south), Havant (12 miles south-east), Eastleigh (6 miles west), Fareham (8 miles south) and Horndean (9 miles south-east).
Local landmarks in Dean
We work in homes and buildings around Swanmore College of Technology and the streets around them. The closest station to Dean is Botley station, about 4.6 miles south-west of the centre. Nearby you’ll also find Bishop's Waltham Museum (1.4 miles south-west). For a walk, there’s Bishops Waltham Branch LNR and Beacon Hill.
What the job involves on each surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.