Hampshire · England
Sand mastic for sash & case windows in Compton, Hampshire
Window and door surrounds in Compton need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Old sand mastic that has cracked, crumbled or fallen out
- Tired mastic found when preparing windows for paint
- A silicone bead on a sash window that spoils the look
Questions from Compton
Is Compton within the area you cover?
Yes. Compton is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for landlords with property near Shawford station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Can old silicone round a sash window be swapped for sand mastic?
Yes, it’s a common request. All the old silicone is removed first so the mastic can sit properly.
How much does sand mastic cost in Compton?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
What is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
Do you guarantee sand mastic work?
All our work has a 12-month guarantee.
Do you offer different sealant colours?
We’ll suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Sand mastic for homes and businesses in Compton
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap so the surround looks right again. If you’re dealing with patchy fillers round a sash window and tired mastic found when preparing windows for paint, we can put it right.
Homes in small places like Compton often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
You are covered for a year from the day we finish. If anything is not right with it, call 0345 464 0079 or drop us an email.
- Where
- Compton (SO21)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Sort the mastic before the decorators arrive
- Get any rot dealt with first
- Make sure water runs off the sill
- Check with your local planning authority if your home is listed
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
Do you need sand mastic in Compton?
Most of it is simply age. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
Most people get in touch when they notice one of these:
- Gaps between timber frames and stone or brick
- Patchy fillers round a sash window
- Draughts and rain around sash boxes
- Mastic that needs renewing before redecorating
Managing a site like Compton All Saints Church of England Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How hidden problems are handled
- How long the guarantee is
- Whether VAT is included
- Are they insured?
How the visit works
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes a few hours for a single window, longer for several from start to finish. Somewhere like Compton needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Preparing for the visit
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- Keep pets and children clear of the area while we work
Getting a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.
Read more
Why act early in Compton
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in and new mastic seals them. Around Compton, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in Compton
- We’re fully insured
- Old sealant always removed completely
- We leave the area clean and tidy
- Over 20 years’ experience
Read our cost guide and what customers say.
What affects the cost of sand mastic
There’s no set price list. What we look at:
- Any working-time requirements on site
- How many areas need sealing
- Whether old sealant or filler has to be cut out
- The size of the job
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.
What else we do in Compton
Frames and glazing around Compton
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around Church of All Saints, the joint between an old wall and a newer frame is generally the first place rain gets in. Rented homes near Shawford station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Compton is about 3 miles south of Winchester, in Hampshire. Wherever you are in the SO21 postcode area, we cover sand mastic for homes and businesses. Our Hampshire coverage runs to 683 places, Compton among them. Our Southampton page covers work nearby.
We work across SO21 for sand mastic. Sand mastic is available to properties on Field Way, Clease Way and Cliff Way. Close by, we work in South Down (1 mile south), Shawford (1 mile east), Otterbourne (1 mile south), Twyford (1 mile east) and Oliver's Battery (2 miles north). Larger places within reach include Winchester (3 miles north), Eastleigh (4 miles south), Fareham (13 miles south-east), Andover (14 miles north-west), Totton (10 miles south-west) and Chandler's Ford (3 miles south-west).
What’s near Compton
In Compton, that means homes and buildings near The Bridge Inn, Thornden School and St. Cross Park. For rail, the closest station is Shawford station, roughly 0.5 miles east. Other landmarks nearby include Balfour Museum of Hampshire Red Cross History (2.4 miles north) and Royal Hampshire County Hospital (2.8 miles north). Open spaces near Compton include Shawford Down and Twyford Down.
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
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, and the work is guaranteed for a year.
Different surfaces, different methods
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we’ll confirm what’s needed.