Hampshire · England
Sand mastic for sash & case windows in Southwood, Hampshire
Our applicators work in Southwood on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Window mastic to renew ahead of painting
- Mastic round period door frames that has failed
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic for homes and businesses in Southwood
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We work on timber door frames, sash and case windows and stone surrounds, and the jobs we see most are draughty sash windows at the surround and crumbling sand mastic round a window.
Around Southwood, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows.
Big or small, you get the same one-year guarantee in Southwood and across Hampshire.
- Where
- Southwood (GU14, GU51)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need sand mastic in Southwood
Rain on the window surround works into any crack and loosens it further. Windows facing the weather tend to go first.
It’s worth asking for a quote if you see:
- Gaps between timber frames and stone or brick
- A silicone bead on a sash window that spoils the look
- Old cement repairs round a window that have failed
- Weathered mastic on the most exposed windows
For site and facilities teams at buildings such as Southwood Infant School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- Whether they’re fully insured
- Who turns up on the day
- What happens if they find a problem under the old sealant
- How long the guarantee is
Nearby places to Southwood
Also in Southwood
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Cracked or broken glass
- Decayed frames that need repair
- Decisions on consent for listed homes
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- Timber door frames
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Sash and case windows
What happens on the day
We keep the work tidy and contained to the area we are working on. The job normally takes a few hours per window, depending on the condition of the joints, and we explain the cure time before we leave. Parking around Southwood 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.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Keep children and pets away from the work area
- Let us know if you’ve seen damp or leaks
How to get a quote
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.
Read more
What affects the quote in Southwood
There’s no set price list. The quote depends on:
- Whether old sealant or filler has to be cut out
- The amount of work
- The type of sealant required
- Access and height
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and send you a clear quote before work begins.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- The rough size of the job
- Pictures of the joints, sent by email
- The type of property
- Whether it has been sealed before
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job.
Frames and glazing around Southwood
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.
Rented homes near Fleet station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near St John the Baptist, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Southwood is about 1 mile west of Farnborough, in Hampshire. We carry out sand mastic for homeowners, landlords and businesses in Southwood and nearby, as part of our work across Hampshire. Southwood is one of 683 places in Hampshire we cover for sand mastic. For nearby work, see our Reading page (13 miles or so).
Every address in GU14 and GU51 is covered for sand mastic. If you need sand mastic at a property on Fleet Road, Kennels Lane and Summit Avenue or anywhere close by, we can help. Other places close to Southwood include Cove (1 mile north), Farnborough (1 mile east), North Camp (2 miles east), Mytchett (3 miles east) and Aldershot (3 miles south-east). Within a short drive, we also cover Basingstoke (13 miles west), Alton (12 miles south-west), Yateley (4 miles north-west), Bordon (13 miles south), Hook (7 miles west) and Popley (12 miles west).
Local landmarks in Southwood
We work in homes and buildings around National Aerospace Library, Ancells Farm Park and Cove School and the streets around them. The nearest railway station is Fleet station, roughly 1.5 miles west of the centre. Nearby you’ll also find Hart Shopping Centre (2.1 miles west) and Royal Army Dental Corps Historical Museum (2.6 miles south-east). For a walk, there’s Aunt's Pool and Ball Hill.
Why deal with it now?
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. In a smaller place like Southwood, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
- Sanitary silicone with an anti-fungal additive in wet areas
- An ARBOMaster approved applicator
Take a look at what affects the cost or what customers say.
For landlords and businesses
If you manage several properties in or around Southwood, several properties can go on one quote. Just tell us the addresses and what each one needs.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Southwood questions
Is Southwood in your area for sand mastic?
Yes, Southwood is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Is Southwood within the area you cover?
Yes, smaller places are covered as well as towns. 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 possible to take out silicone and use sand mastic instead?
Generally, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Can new sealant go over the old?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or drop us an email.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures.
Can landlords and businesses book you?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels in Southwood.