Hampshire · England
Sand mastic for sash & case windows in Charlwood, Hampshire
Sand mastic for Charlwood and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Crumbling sand mastic round a window
- Draughty sash windows at the surround
- Mastic worn away on windows facing the weather
Charlwood homes and the weather
Historic houses like Bentworth Hall (about 4.8 miles north) are a reminder that the area around Charlwood has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Monkwood Mission Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Charlwood is about 6 miles south-west of Alton, in Hampshire. Wherever you are in the SO24 postcode area, we cover sand mastic for homes and businesses. Charlwood is one of 683 towns and villages in Hampshire we cover. You can also see our page for Southampton, roughly 19 miles from Charlwood.
Postcode districts we cover here for sand mastic: SO24. Neighbouring places we cover for sand mastic include Monkwood (1 mile south-west), Kitwood (1 mile north-west), Gilbert Street (1 mile north-west), Ropley (2 miles west) and West Tisted (2 miles south-west). Larger places within reach include Basingstoke (13 miles north), Winchester (12 miles west), Havant (15 miles south), Eastleigh (15 miles south-west), Horndean (12 miles south) and Alton (6 miles north-east).
Local landmarks in Charlwood
Other landmarks nearby include Alton Community Hospital (4.7 miles north-east). Not far away are Red Hill and Shutts Copse.
About our sand mastic in Charlwood
Sand mastic doesn’t last for ever, leaving gaps round the window. Renewing it closes the gap and tidies the surround. We work on timber door frames, brick reveals and period & listed homes, and common reasons people get in touch are old cement repairs round a window that have failed and gaps between timber frames and stone or brick.
Around Charlwood, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Every job comes with our 12-month guarantee, wherever you are in Hampshire.
- Location
- Charlwood (SO24)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Quotes for sand mastic in Charlwood
The price is agreed before any work begins. It’s based on:
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
- Whether the work is at height
- How many rooms, windows or areas are involved
Doing several joints on one visit usually makes better use of the time than several visits. We’ll give you a clear quote for the lot.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How many joints, rooms or windows are involved
- Where the property is
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Towns and villages near Charlwood
Other services in Charlwood
Charlwood questions
Is Charlwood within the area you cover?
Yes, Charlwood is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Is sand mastic in Charlwood guaranteed?
All our work, in Charlwood and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Is it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We’ll tell you what we’re using and why.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Should I use sand mastic or silicone?
We will help you decide. Sand mastic suits many period homes, and modern sealants suit newer frames.
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Ask the planning authority about consent for listed or conservation-area homes
- Clear gutters so water does not pour onto the windows
- Look over the window mastic once a year
- Renew mastic before redecorating the windows
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
What happens if it’s left?
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. In a small place like Charlwood, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, phone 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why book with us
- More than 20 years in sealant work
- We never seal over old sealant
- Trusted Arbo and Everbuild sealants
- Experience in homes, commercial sites and hotels
See what affects the cost and customer reviews.
Signs you need sand mastic in Charlwood
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
Keep an eye out for these signs:
- Open joints round the window box
- Silicone on a period window that looks wrong
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
In and around Charlwood, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Comparing quotes
- What guarantee comes with the work
- Whether all the old sealant comes out first
- How the joint is cleaned and prepared
- Whether VAT is included
When it isn’t the sealant
In fairness, some problems need a different trade:
- Decisions on consent for listed homes
- Sashes that rattle, stick or won’t open
- Putty and glazing repairs
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
Where we work in Charlwood
- Timber door frames
- Stone surrounds
- Period & listed homes
- Brick reveals
- Sash and case windows
- Tenement windows
The process
When we arrive, we look over the joints with you first, so you know exactly what we are doing. Surfaces next to the work are protected before we start. Most jobs take a few hours per window, depending on the condition of the joints. Somewhere as small as Charlwood, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check the window surrounds and agree which joints need renewing.
- 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 finish is dressed so it sits neatly against the stone or brick.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
- Try not to wet indoor joints just before the visit
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job.
Read more
Different surfaces, different methods
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.