Hampshire · England
Sand mastic for sash & case windows in Newtown, Hampshire
Our applicators work in Newtown on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Gaps between timber frames and stone or brick
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
Sand mastic for homes and businesses in Newtown
Across Newtown, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand for a neat, traditional finish. If you’re dealing with mastic worn away on windows facing the weather and draughty sash windows at the surround, we can help, on brick reveals, sash and case windows and timber door frames alike.
Mastic can only go onto a dry, clean joint, so window work in Newtown is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Big or small, you get the same 12-month guarantee.
- Place
- Newtown (PO17)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for sand mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- Working hours on commercial sites
- The product the joint needs
- How easy the joints are to reach
- How much there is to do
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- Where the job is, and your postcode
- Any previous sealing or DIY work
- How we’d reach the joints
- A few photos by email, if you can
If you are in Newtown and need sand mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Honest limits
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Masonry that needs repairing
- Timber that has rotted
- Whether work needs listed building consent
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Timber door frames
- Sash and case windows
- Brick reveals
- Period & listed homes
- Tenement windows
- Stone surrounds
The process
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a single window, longer for several. Somewhere like Newtown 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.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- Tell us about any water getting in
Getting a quote
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
What we’re called out for in Newtown
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
The most common problems we see are:
- Mastic that needs renewing before redecorating
- Draughty sash windows at the surround
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
Homes close to Church of the Holy Trinity include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What your quote should include
- What happens if they find a problem under the old sealant
- What guarantee comes with the work
- Whether VAT is included
- Who does the work, and how experienced they are
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Ask a joiner to look at soft timber first
- Renew mastic before redecorating the windows
- Inspect the joints round the windows every year or so
- Clear gutters so water does not pour onto the windows
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
What sand mastic looks like in Newtown
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Newtown Soberton Infant School, larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Portchester station, any sash windows need sound mastic to keep draughts and rain out.
Newtown is about 5 miles north-west of Waterlooville, in Hampshire. Homes, rented property, offices and hotels in Newtown is covered for sand mastic. Every job comes with our one-year guarantee. Newtown is one of 683 places in Hampshire where we work. You can also see our page for Portsmouth, roughly 8 miles from Newtown.
Postcode districts we cover here for sand mastic: PO17. If you need sand mastic at a property on Church Road, Hundred Acres Road and Ingoldfield Lane or anywhere close by, we can help. We also cover the places around Newtown: Southend (1 mile north-east), Soberton Heath (1 mile north), Hoe Gate (1 mile east), Hipley (1 mile south-east) and Woodend (1 mile north-west). Within a short drive, we also cover Winchester (13 miles north-west), Gosport (8 miles south), Havant (7 miles south-east), Eastleigh (10 miles west), Fareham (5 miles south-west) and Horndean (5 miles east).
Local landmarks in Newtown
Typical jobs here are in homes near The Bold Forester Public House and the streets around them. The nearest railway station is Portchester station, roughly 4.4 miles south. Other landmarks nearby include Knowle Hospital (3.8 miles south-west). Not far away are St Clair's Meadow and Portsdown Hill.
Newtown: your questions answered
Is Newtown in your area for sand mastic?
Yes. Our work covers London and the South East, and Newtown is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Do you cover smaller places like Newtown?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply phone 0345 464 0079 or send us an email.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Do you work for landlords and businesses?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels in Newtown.
Can I choose the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Is consent needed for window work on a listed home?
It’s best to ask your local planning authority first. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Why it’s worth doing now in Newtown
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Where a wall is exposed, as many are in small places like Newtown, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Call for a quick quote and we’ll explain what it covers.
Why Newtown customers choose us
- An ARBOMaster approved applicator
- Full insurance on every job
- Homes, businesses and hotels
- Anti-fungal silicone where joints get wet
Read our cost guide or our reviews.