Hampshire · England
Sand Mastic in Portmore
Problem with your window and door surrounds in Portmore? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
- Cracked mastic round a front door frame
About our sand mastic in Portmore
Traditional burnt sand mastic blends with stone and brick surrounds. It suits period and listed homes where a modern sealant bead would stand out. Typical jobs include old cement repairs round a window that have failed and wind and rain getting in round a sash window, across stone surrounds, sash and case windows and period & listed homes.
Around Portmore, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Each job carries a 12-month guarantee, large or small.
- Location
- Portmore (SO41)
- Region
- Hampshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Portmore homes and the weather
Portmore 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. Historic houses like Beaulieu Palace House (about 4.5 miles north-east) are a reminder that the area around Portmore has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Saint Nicholas Chapel, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as Southlands School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Portmore is about 2 miles north-east of Lymington, in Hampshire. Whether you’re in the middle of Portmore or further out, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Portmore is one of 683 towns and villages in Hampshire we cover for sand mastic. Our Southampton page covers work nearby.
Postcode districts we cover here for sand mastic: SO41. Local streets include Warborne Lane, Jordans Lane and Main Road, all of which we cover. We also cover Warborne (1 mile west), Pilley (1 mile north-west), Bull Hill (1 mile north), Pilley Bailey (1 mile north) and Walhampton (1 mile south). Within a short drive, we also cover Eastleigh (15 miles north-east), Fareham (15 miles east), Totton (10 miles north), Hedge End (14 miles north-east), Romsey (15 miles north) and Hythe (8 miles north-east).
Near you in Portmore
Typical jobs here are in homes near William Gilpin Church of England Primary School, Priestlands School and Walhampton Arms, among other places. For rail, the closest station is Lymington Town station, about 1.1 miles south-west of the centre. A little further out are Lymington New Forest Hospital (1 mile south-west) and Yarmouth Castle (4.8 miles south). Green spaces nearby include Boldre Foreshore.
Honest limits
Sealant is not the answer to every problem, and we’ll tell you before work begins. It will not solve:
- Timber that has rotted
- Broken panes
- Decisions on consent for listed homes
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Portmore
- Timber door frames
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Brick reveals
- Tenement windows
Why act early in Portmore
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. Where a wall is exposed, as many are in small places like Portmore, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What you get with us
- Neat joints and a tidy finish
- Approved under the ARBOMaster scheme
- Quality sealants from Arbo and Everbuild
- A 12-month guarantee on all work
Places near Portmore
What else we do in Portmore
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Common questions in Portmore
Does living near the coast affect sand mastic in Portmore?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you cover smaller places like Portmore?
Yes. Portmore is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Will the old sealant be removed?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Are you fully insured?
Yes. We are fully insured.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it possible to take out silicone and use sand mastic instead?
Normally, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Is the work guaranteed?
You get our 12-month guarantee to all our work.
What information do you need?
The location, the problem and the rough size of the job. Photos by email help too.
Different surfaces, different methods
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Do you need sand mastic in Portmore?
Age is the main cause. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
The problems people generally mention when they call include:
- Open joints round the window box
- Mastic worn away on windows facing the weather
- Cement or filler used on old window joints that has cracked
- Modern sealant on a period surround
Rented homes near Lymington Town station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Comparing quotes
- Is VAT in the price?
- How much experience the applicator has
- How the joint is cleaned and prepared
- Whether all the old sealant comes out first
The process
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a single window, longer for several. Somewhere as small as Portmore, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Tell us if parking is tricky
- Let us know if you’ve seen damp or leaks
- Keep children and pets away from the work area
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and give you a clear price.