Portsmouth · England
Sand mastic for sash & case windows in North End, Portsmouth
Specialist sand mastic for North End: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Patchy fillers round a sash window
- Window mastic to renew ahead of painting
- Crumbling sand mastic round a window
How we handle sand mastic in North End
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you’re dealing with old cement repairs round a window that have failed and mastic worn away on windows facing the weather, we can put it right.
Around North End, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- North End (PO2, PO1)
- Wider area
- Portsmouth
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens if it’s left?
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall, so dealing with it now protects both. Around North End, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Rated 4.9 stars on Google
- Quality sealants from Arbo and Everbuild
- Anti-fungal sanitary silicone in wet areas
- Fully insured
Take a look at our cost guide or what customers say.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
What the job involves on each surface
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.
Sand mastic in North End: local notes
North End is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Corpus Christi Catholic Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. In the older streets around St. Mark’s, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
North End is about 1 mile north of Portsmouth, in Portsmouth. For sand mastic in and around North End, it’s easy to get a quote: please call 0345 464 0079 or email us. We are based in Crawley and cover Portsmouth. Across Portsmouth, we cover 19 places, North End among them.
Work in PO2 and PO1 works the same way as everywhere else we cover. If you need sand mastic at a property on Knox Road, Croft Road and Kirby Road or a nearby road, our applicators can take on the job. Being close to the A2047, North End is easy for our applicators to reach for sand mastic. Nearby, we also carry out sand mastic in Rudmore (1 mile south-west), Tipner (1 mile west), Portsmouth (1 mile south), Copnor (1 mile south-east) and Hilsea (1 mile north-east).
Landmarks near North End
We work in homes and buildings around Mayfield School, Alexandra Park and St Edmund's Catholic School. The closest station to North End is Hilsea station, roughly 1.2 miles north-east. Other landmarks nearby include Charles Dickens Birthplace Museum (0.8 miles south-west) and Portchester Castle (2.1 miles north-west). For a walk, there’s Portsdown Hill and Milton Locks.
Signs you need sand mastic in North End
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint, and they normally need raking out.
Signs it’s time to call us include:
- Open joints round the window box
- Draughts and rain around sash boxes
- Window mastic to renew ahead of painting
- Mastic worn away on windows facing the weather
Rented homes near Hilsea station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Questions to ask before booking
- Whether they’re fully insured
- Whether VAT is included
- The length of the guarantee
- What happens if they find a problem under the old sealant
Common questions in North End
Do you cover smaller places like North End?
Yes. North End 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.
Does the coastal weather in North End affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Can I choose the sealant colour?
We will suggest a colour to suit the surroundings. The product needed can limit the range.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Are you insured?
Yes. We are fully insured.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Do you work for letting agents?
Yes, regularly. We can quote for several properties at once, and between tenancies is a good time for the work.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we’ll advise.
Honest limits
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Decayed frames that need repair
- Sash cords, weights and draught-proofing of the sashes
- Broken panes
If you are not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in North End
- Brick reveals
- Stone surrounds
- Period & listed homes
- Tenement windows
- Sash and case windows
- Timber door frames
Also in North End
What we do, step by step
There is not much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to a full day, depending on how many windows from start to finish. Parking around North End is usually 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 start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Tell us if parking is tricky
- Let us know about stairs, lifts or work at height
Ask for a quote
For sand mastic in North End, call 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.