Hampshire · England
Newton Valence Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Newton Valence, with a 12-month guarantee on every job. Call for a quick quote.
- Modern sealant on a period surround
- Cracked mastic round a front door frame
- Old cement repairs round a window that have failed
Sand mastic in Newton Valence
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. We work on tenement windows, period & listed homes and timber door frames, and common reasons people get in touch are patchy fillers round a sash window and gaps round a timber door in stone or brick.
Mastic can only go onto a dry, clean joint, so window work in Newton Valence is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Newton Valence (GU34)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. Somewhere like Newton Valence needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Getting a quote
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Honest limits
To be straight with you, there are a few things sealant won’t fix:
- Planning or listed building consent (your local planning authority decides)
- Masonry that needs repairing
- Timber that has rotted
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Period & listed homes
- Tenement windows
- Timber door frames
- Stone surrounds
- Sash and case windows
- Brick reveals
Towns and villages near Newton Valence
Other services in Newton Valence
Questions from Newton Valence
Will you come out to Newton Valence?
Yes, Newton Valence is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Alton station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Can you match the sealant colour?
We will suggest a colour to suit the surroundings. The choice depends on the product the joint needs.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
How long does sand mastic take?
As a guide, most jobs take a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer, and we will say how long yours will take.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Inspect the joints round the windows every year or so
- Plan mastic work ahead of painting
- Avoid heavy scraping on the mastic joint
- Leave the new mastic unpainted
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
Why act early in Newton Valence
An open joint round the frame lets weather in. Water can get to the frame and the masonry, so dealing with it now protects both. Around Newton Valence, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
What you get with us
- Anti-fungal silicone where joints get wet
- More than 20 years in sealant work
- Neat joints and a tidy finish
- Experience in homes, commercial sites and hotels
Read what affects the cost or customer reviews.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
What sand mastic looks like in Newton Valence
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Newton Valence is about 4 miles south of Alton, in Hampshire. Anywhere in GU34, our applicators can take on sand mastic. Our area takes in 683 places across Hampshire. There’s also a page for Portsmouth, about 20 miles away.
Postcode districts we cover here for sand mastic: GU34. We also cover the places around Newton Valence: Selborne (1 mile east), Empshott (2 miles east), Lower Green (3 miles south-east), Hawkley (3 miles south-east) and Oakshott (3 miles south). Larger places within reach include Basingstoke (13 miles north-west), Winchester (15 miles west), Fleet (14 miles north-east), Horndean (13 miles south), Aldershot (14 miles north-east) and Alton (4 miles north).
What’s near Newton Valence
The nearest railway station is Alton station, about 4.2 miles north of the centre. Well-known places in the area include Alton Community Hospital (3.4 miles north) and The Romany Museum (1.4 miles east). Green spaces nearby include Selborne Hill and Liss Riverside Railway Walk North.
Work for landlords, hotels and businesses
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Signs you need sand mastic in Newton Valence
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber, and they usually need raking out.
Common reasons people contact us are:
- Mastic round period door frames that has failed
- Modern sealant on a period surround
- Weathered mastic on the most exposed windows
- Patchy fillers round a sash window
Rented homes near Alton station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Comparing quotes
- Which sealant they’ll use, and why
- The length of the guarantee
- Is the old sealant removed completely?
- How long to leave it before use