Hampshire · England
Sand mastic for sash & case windows in Marchwood, Hampshire
Window and door surrounds in Marchwood need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Old cement repairs round a window that have failed
- Tired mastic found when preparing windows for paint
- Cracked mastic round a front door frame
How it works
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. The job normally takes a few hours for a single window, longer for several, and we explain the cure time before we leave. For a job in Marchwood, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Mention any parking rules near the property
- Plan for the work area to be out of bounds to pets and children
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
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Sand mastic in Marchwood
Sand mastic does not last for ever and gaps open up round the frame. Renewing it closes the gap so the surround looks right again. Typical jobs include old sand mastic that has cracked, crumbled or fallen out and gaps round a timber door in stone or brick, across period & listed homes, sash and case windows and timber door frames.
Many houses in smaller places like Marchwood have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows.
You are covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or send us an email.
- Where
- Marchwood (SO40)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Marchwood homes and the weather
Marchwood is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around older windows and doors, especially on the side facing the sea. 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.
For landlords with property near Millbrook (Hants) station, older sash windows in a rental need their mastic kept sound to keep the weather out. If you live in an older home near Church of St John the Apostle, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Marchwood is about 3 miles south-east of Totton, in Hampshire. If you need sand mastic in Marchwood, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We’re based in Crawley and cover Hampshire. Marchwood is one of 683 places in Hampshire where we work.
Jobs for sand mastic in SO40 works the same way as everywhere else we cover. We cover properties on Cranberry Close, Melick Close and The Rowans. Marchwood sits on or near the A326. Neighbouring places we cover for sand mastic include Dibden (2 miles south-east), Dibden Purlieu (3 miles south-east), Hythe (3 miles south-east), Beaulieu (5 miles south) and Furzey Lodge (5 miles south). Further out, we also cover Winchester (13 miles north-east), Gosport (14 miles south-east), Eastleigh (7 miles north-east), Fareham (11 miles east), Totton (3 miles north-west) and Chandler's Ford (7 miles north-east).
Local landmarks in Marchwood
Locally, jobs take us to homes and businesses close to White Horse pub and Hounsdown School, among other places. The closest station to Marchwood is Millbrook (Hants) station, roughly 1.6 miles north-east. Well-known places in the area include Netley Castle (4.1 miles east) and Westquay (2.1 miles east). The countryside around Marchwood includes Testwood Lakes.
FAQs for Marchwood
Does the coastal weather in Marchwood affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Is Marchwood within the area you cover?
Yes. Marchwood 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.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
How long does the job take?
A typical job takes a few hours for a single window, longer for several. We’ll confirm how long when we quote.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Can you do several jobs on one visit?
Yes. Just list everything you need and you will get one quote.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we are using and why.
Keeping the joints in good condition
So the new joints stay in good condition:
- Leave the new mastic unpainted
- Don’t run silicone over sand mastic
- Plan mastic work ahead of painting
- Ask a joiner to look at soft timber first
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at before trying a quick fix.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Quotes for sand mastic in Marchwood
For a quick quote, just ask. What matters most is:
- How easy the joints are to reach
- The number of rooms or windows
- The type of sealant required
- Whether old sealant or filler has to be cut out
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- The address or postcode of the job
- How we’d reach the joints
- The problem you’ve noticed
- Whether it has been sealed before
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Places near Marchwood
Also in Marchwood
Signs you need sand mastic in Marchwood
Timber frames move with the seasons. That movement opens up the mastic joint over time.
Keep an eye out for any of the following:
- Open joints round the window box
- Mastic dropping out of the joint
- Weathered mastic on the most exposed windows
- Mastic round period door frames that has failed
For site and facilities teams at buildings such as Marchwood Junior School, larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- What insurance they hold
- Whether you can choose the colour
- Whether VAT is included
- How much experience the applicator has
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Landlords, agents and businesses in Marchwood
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Why act early in Marchwood
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. In an older home around Marchwood, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
What you get with us
- Old sealant always removed completely
- A 12-month guarantee on all work
- An ARBOMaster approved applicator
- Rated 4.9 stars on Google
Read our cost guide and customer reviews.