Hampshire · England
Sand mastic for sash & case windows in Southend, Hampshire
Sand mastic in Southend from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Open joints round the window box
- Mastic dropping out of the joint
- Draughty sash windows at the surround
Sand mastic in Southend, done properly
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. If you have open joints round the window box and crumbling sand mastic round a window, we can help, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Southend is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
All our work comes with a one-year guarantee.
- Where
- Southend (SO32)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Frames and glazing around Southend
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 site and facilities teams at buildings such as Newtown Soberton Infant School, larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Portchester station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Southend is about 5 miles north-west of Waterlooville, in Hampshire. If you need sand mastic in Southend, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We cover Hampshire from our Crawley base. We cover 683 towns and villages across Hampshire, from the larger towns to small villages. There’s also a page for Portsmouth, roughly 8 miles from Southend.
Postcode districts we cover here for sand mastic: SO32. If you’re just outside Southend, we cover Newtown (1 mile south-west), Soberton Heath (1 mile west), Hoe Gate (1 mile south-east), Woodend (1 mile west) and Hipley (1 mile south). Further out, we also cover Winchester (13 miles north-west), Gosport (8 miles south), Havant (7 miles south-east), Eastleigh (10 miles west), Fareham (6 miles south-west) and Horndean (5 miles east).
Around Southend
In Southend, that means homes and buildings near The Bold Forester Public House and the streets around them. Southend’s nearest station is Portchester station, about 5 miles south. A little further out are Knowle Hospital (4.4 miles south-west). Green spaces nearby include St Clair's Meadow and Portsdown Hill.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Why act early in Southend
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in and new mastic seals them. Around Southend, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What you get with us
- Old sealant always removed completely
- Anti-fungal silicone where joints get wet
- Approved under the ARBOMaster scheme
- Rated 4.9 stars on Google
See what affects the cost and our reviews.
What the job involves on each surface
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Nearby places to Southend
Other services in Southend
How to look after the new joints
So the new joints stay in good condition:
- Avoid heavy scraping on the mastic joint
- Find out about consent before window work on a listed home
- Ask a joiner to look at soft timber first
- Look over the window mastic once a year
Don’t run silicone over the new mastic. If you see a crack, ask us to take a look rather than patching it.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Common problems we fix in Southend
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber, and they usually need raking out.
Most people get in touch when they notice something like this:
- A silicone bead on a sash window that spoils the look
- Cracked mastic round a front door frame
- Failed mastic on an exposed elevation
- Gaps where the frame meets the masonry
Homes close to Church of the Holy Trinity include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
What to look for in a quote
- Who does the work, and how experienced they are
- How long to leave it before use
- What preparation is included
- Are they insured?
Southend: your questions answered
Can you help a landlord with a rental near Portchester station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Can you do sand mastic in Southend?
Yes. Our work covers London and the South East, and Southend is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
Where do you work from?
Mr Mastic is based in Crawley. We cover Southend and the rest of Hampshire, along with the rest of our area.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can I choose the sealant colour?
In most cases you can choose. We’ll tell you which colours the right product comes in and agree one before work begins.
How long does the job take?
It depends on the size of the job, but as a guide it takes a few hours per window, depending on the condition of the joints. We’ll tell you when we quote.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
What happens on the day
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and clear up. It usually takes anything from a few hours to a full day, depending on how many windows. In a small place like Southend, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.