Hampshire · England
Dumpford Sand Mastic
Window and door surrounds in Dumpford need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Wind and rain getting in round a sash window
- Gaps round a timber door in stone or brick
- Cement or filler used on old window joints that has cracked
How we handle sand mastic in Dumpford
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, and new mastic is applied and shaped by hand. If you’re dealing with gaps where the frame meets the masonry and a silicone bead on a sash window that spoils the look, we can put it right, on brick reveals, period & listed homes and sash and case windows alike.
Homes in small places like Dumpford often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Dumpford (GU31)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Dumpford
Is Dumpford within the area you cover?
Yes. Dumpford is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do sand mastic in Dumpford?
Yes, Dumpford 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.
Where are you based?
We work from Crawley. Our applicators cover Dumpford, along with the rest of our area.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
What is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s applied by hand and finished to sit neatly against the masonry.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and you will get one quote.
How long does sand mastic take to go off?
A skin forms quite soon, but full hardening takes longer. We will explain what to expect before we leave.
Is the work guaranteed?
All our work has a 12-month guarantee.
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- Any mould that needs treating
- The type of sealant required
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
What we need to know
To make quoting easier, let us know:
- Where the property is
- Roughly how big the job is
- Whether it’s a home or a business
- Photos by email, if that is easy
If you are in Dumpford and need sand mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before we start.
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 renewing it early protects the window. Where a wall is exposed, as many are in small places like Dumpford, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- We never seal over old sealant
- Neat joints and a tidy finish
- 20+ years of sealant experience
- Sanitary silicone with an anti-fungal additive in wet areas
What the job involves on each surface
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. We shape it by hand to follow the stone.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
How it works
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Dumpford, 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.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
Getting a quote
To get a quote, call 0345 464 0079 or send us an email 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
Sand mastic in Dumpford: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Cowdray House (about 3.8 miles east) are a reminder that the area around Dumpford has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Liss station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Dumpford is about 5 miles east of Petersfield, in Hampshire. Homes, rented property, offices and hotels in Dumpford is covered for sand mastic. The work is guaranteed for a year. We cover 683 towns and villages across Hampshire, large and small. For nearby work, see our Portsmouth page, about 17 miles away.
We work across GU31 for sand mastic. Sand mastic is available to properties on Terwick Lane, Mill Lane and Trotton Road and the roads around them. We also cover the places around Dumpford: Trotton (1 mile north-east), Elsted Marsh (1 mile south), Ingrams Green (1 mile south-east), Elsted (2 miles south-west) and Nyewood (2 miles west). Larger places within reach include Havant (11 miles south-west), Horndean (10 miles south-west), Alton (13 miles north-west), Waterlooville (12 miles south-west), Petersfield (5 miles west) and Purbrook (13 miles south-west).
What’s near Dumpford
Typical jobs here are in homes near The Keeper's Arms Public House. Dumpford’s nearest station is Liss station, roughly 4.9 miles north-west of the centre. Other landmarks nearby include Midhurst Museum (3.5 miles east) and Midhurst Community Hospital (3.6 miles east). For a walk, there’s Iping and Stedham Commons and Wheeler's Down.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Sashes that rattle, stick or won’t open
- Broken panes
- Timber that has rotted
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Period & listed homes
- Brick reveals
- Sash and case windows
- Stone surrounds
- Tenement windows
- Timber door frames
Signs you need sand mastic in Dumpford
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Signs it’s time to call us include:
- Mastic that needs renewing before redecorating
- Wind and rain getting in round a sash window
- Gaps where the frame meets the masonry
- Silicone on a period window that looks wrong
In the older streets around St George's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before booking
- How much experience the applicator has
- What happens if they find a problem under the old sealant
- What preparation is included
- Whether the sealant suits the joint