Portsmouth · England
Portsmouth Point Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Portsmouth Point and across Portsmouth. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- A silicone bead on a sash window that spoils the look
- Failed mastic on an exposed elevation
- Old cement repairs round a window that have failed
How we quote for sand mastic
You will get a clear quote before work begins. It’s based on:
- The product the joint needs
- The number and length of the joints
- The number of rooms or windows
- The old material and how stubborn it is
What you pay reflects the work, not a rough estimate. That is why we ask about the job first and agree the price before starting.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- Any access issues, like height or stairs
- What’s wrong with the joints now
- Where the job is, and your postcode
- Any previous sealing or DIY work
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or drop us an email with the details, and photos are welcome.
Sand mastic for homes and businesses in Portsmouth Point
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. We’re often asked to deal with patchy fillers round a sash window and wind and rain getting in round a sash window, on timber door frames, tenement windows and period & listed homes.
Houses in smaller places like Portsmouth Point can stand more in the open than those in a built-up town. That’s hard on the mastic around frames and sills.
Whatever the size of the job, you get the same one-year guarantee in Portsmouth Point and across Portsmouth.
- Place
- Portsmouth Point (PO1, PO5, PO12)
- Region
- Portsmouth
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Sashes that rattle, stick or will not open
- Rotten sashes, sills or window boxes (a joiner’s job)
- Cracked or broken glass
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Where we work in Portsmouth Point
- Timber door frames
- Tenement windows
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Brick reveals
Places near Portsmouth Point
Also in Portsmouth Point
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. Homes in smaller places like Portsmouth Point can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- Neat joints and a tidy finish
- Approved under the ARBOMaster scheme
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
Take a look at our cost guide or what customers say.
DIY sealant or a professional job?
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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
FAQs for Portsmouth Point
Do you cover smaller places like Portsmouth Point?
Yes, smaller places are covered as well as towns. 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 Portsmouth Harbour station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
How long does the job take?
Most jobs take a few hours for a single window, longer for several, including the preparation. Your quote will say how long we expect yours to take.
Which is right for my windows, sand mastic or modern sealant?
We’ll help you decide. Period homes often look best with sand mastic and newer frames suit modern sealant.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Is it worth trying it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Sand mastic in Portsmouth Point: local notes
Portsmouth Point is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Portsmouth Harbour station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. For an older house near a landmark such as Portsmouth Garrison church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as St Jude's CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Portsmouth Point is about 2 miles west of Southsea, in Portsmouth. Wherever you are in the PO1 postcode area, we can carry out sand mastic at your property. We cover 19 towns and villages across Portsmouth, from the larger towns to small villages.
Here we cover the PO1, PO5 and PO12 postcode area for sand mastic. We cover properties on Park Road, Nobbs Lane and Bath Square. Neighbouring places we cover for sand mastic include Portsea (1 mile north), Clayhall (1 mile south-west), Haslar (1 mile south-west), Alverstoke (2 miles south-west) and Privett (2 miles west). Within a short drive, we also cover Hilsea (3 miles north-east), Wymering (4 miles north), Paulsgrove (4 miles north), Cosham (4 miles north-east), Drayton (5 miles north-east) and Farlington (5 miles north-east).
Around Portsmouth Point
We work in homes and buildings around Charter Academy, Portsmouth Grammar School and Bridge Tavern. Portsmouth Point has its own railway station: Portsmouth Harbour station. A little further out are Southsea Castle (1.2 miles south-east) and Portsmouth Museum And Art Gallery (less than half a mile east). Open spaces near Portsmouth Point include Portsdown Hill and Milton Locks.
The process
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several. Parking around Portsmouth Point is normally 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.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
- Mention if the joints have been sealed before
How to get a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear quote before work begins.
Advice
Surface by surface
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Stone surrounds
Sand mastic sits naturally against stone. It finishes to look like part of the surround.
Landlords, agents and businesses in Portsmouth Point
Letting agents and landlords in Portsmouth Point can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.