Hampshire · England
Sand mastic for sash & case windows in Whitchurch, Hampshire
We cover Whitchurch for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Old cement repairs round a window that have failed
- Mastic round period door frames that has failed
- Old sand mastic that has cracked, crumbled or fallen out
About our sand mastic in Whitchurch
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. We rake it out and renew it so the surround looks right again. We work on tenement windows, sash and case windows and period & listed homes, and people most often call us about window mastic to renew ahead of painting and gaps where the frame meets the masonry.
Houses in smaller places like Whitchurch can stand more in the open than those in a built-up town. That is hard on the mastic around frames and sills.
Our work is backed for twelve months, in Whitchurch and everywhere else we cover.
- Place
- Whitchurch (RG28)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Whitchurch
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
What we are called out for in Whitchurch
Shallow joints are a common cause. A thin layer doesn’t hold well, which is why we pack deep voids first and get the depth right.
Look out for any of the following:
- Patchy fillers round a sash window
- Draughts and rain around sash boxes
- Weathered mastic on the most exposed windows
- Mastic that needs renewing before redecorating
Letting a property close to Whitchurch (Hampshire) station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
What your quote should include
- When the joint can take water or movement
- Whether VAT is included
- What product goes in the joint
- Whether they’re fully insured
What affects the quote in Whitchurch
Some jobs are bigger than they look, and some smaller. The main factors:
- When we can work, for business premises
- Any mould that needs treating
- How easy the joints are to reach
- The old material and how stubborn it is
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
What we need to know
Photos help, but a description is a good start. Please mention:
- The rough size of the job
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
- What’s wrong with the joints now
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Towns and villages near Whitchurch
More services for Whitchurch
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours per window, depending on the condition of the joints, and the area is left clean. Parking around Whitchurch is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Clear items away from the joints we are working on
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Advice
DIY versus a professional finish
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
FAQs for Whitchurch
Will you come out to Whitchurch?
Yes, Whitchurch is covered. 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.
Is Whitchurch in your area for sand mastic?
Yes. We work across London and the South East, and Whitchurch is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Can you quote for more than one area?
Yes. Just list everything you need and you’ll get one quote.
Looking after it afterwards
After the cure time, these simple habits help:
- Ask the planning authority about consent for listed or conservation-area homes
- Clear gutters so water does not pour onto the windows
- Don’t paint over the new mastic
- Avoid patching sand mastic with silicone
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
What sand mastic looks like in Whitchurch
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.
Managing a site like Whitchurch Church of England Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around Church of All Hallows, the joint between an old wall and a newer frame is generally the first place rain gets in.
Whitchurch is about 6 miles east of Andover, in Hampshire. Whitchurch gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. 683 places in Hampshire are on our list. You can also see our page for Southampton, roughly 22 miles from Whitchurch.
All of RG28 is covered for sand mastic. You’ll find streets such as London Road, Station Road and London Street, and we cover them all. Main roads around Whitchurch include the B3400. Neighbouring places we cover for sand mastic include Wells-in-the-Field (1 mile east), Freefolk (1 mile east), Cole Henley (2 miles north), Firgo (2 miles south) and Hurstbourne Priors (2 miles south-west). We also work in nearby towns such as Basingstoke (10 miles east), Winchester (12 miles south), Andover (6 miles west), Tadley (12 miles north-east), Hyde (11 miles south) and Popley (12 miles east).
Around Whitchurch
We work in homes and buildings around The Red House Public House and Testbourne Community School. For rail, the closest station is Whitchurch (Hampshire) station, roughly 0.5 miles north of the centre.
Why act early in Whitchurch
Draughts round a sash window aren’t always the sashes. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Around Whitchurch, water from a failed joint in an older home can soak into timber and plaster, and that’s a much bigger job than renewing the sealant.
Rather than a set price list, 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.
Why choose Mr Mastic in Whitchurch
- Trusted Arbo and Everbuild sealants
- A 12-month guarantee on all work
- We are fully insured
- Rated 4.9 stars on Google
See our cost guide and customer reviews.