Hampshire · England
Sand mastic for sash & case windows in Welborne, Hampshire
Specialist sand mastic for Welborne: careful preparation, the right product and tidy work. Call for a quick quote.
- Modern sealant on a period surround
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
How we handle sand mastic in Welborne
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. If you are dealing with patchy fillers round a sash window and old sand mastic that has cracked, crumbled or fallen out, we can put it right.
Homes in small places like Welborne often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Where
- Welborne (PO17)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What we cannot put right
We’ll always be straight with you, so here’s what sealant cannot fix:
- Damaged stone surrounds
- Decisions on consent for listed homes
- Sash cords, weights and draught-proofing of the sashes
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Timber door frames
- Tenement windows
- Period & listed homes
- Sash and case windows
- Brick reveals
- Stone surrounds
Nearby places to Welborne
More services for Welborne
Surface by surface
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Welborne questions
Will you come out to Welborne?
Yes. Welborne 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.
Does living near the coast affect sand mastic in Welborne?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
What does sand mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Can sand mastic be painted?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
What exactly 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.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Sand mastic in Welborne: local notes
Welborne is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. 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 The Henry Cort Community College, the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Fareham station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Welborne is about 2 miles north of Fareham, in Hampshire. For sand mastic in and around Welborne, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We cover Hampshire from our Crawley base. Across Hampshire, we cover 683 places, Welborne among them. You can also see our page for Portsmouth, roughly 7 miles from Welborne.
Our applicators cover all of PO17 for sand mastic and the streets around it. Nearby, we also carry out sand mastic in Crockerhill (1 mile east), Wickham Common (1 mile north-east), North Fareham (1 mile south-east), Hundred Acres (2 miles north-east) and Fareham (2 miles south). We also work in nearby towns such as Winchester (13 miles north-west), Gosport (6 miles south), Havant (9 miles east), Eastleigh (9 miles north-west), Horndean (8 miles east) and Totton (14 miles west).
Around Welborne
In Welborne, that means homes and buildings near The Miners Arms and the streets around them. Welborne’s nearest station is Fareham station, about 1.9 miles south of the centre. Nearby you’ll also find Carron Row Farm Museum (2.4 miles south-west) and Portchester Castle (4.5 miles south-east). Green spaces nearby include Portsdown Hill and Swanwick Lakes.
Common problems we fix in Welborne
Sand mastic slowly weathers. It hardens, cracks and starts to come away on the stone or timber.
These are the problems we’re asked about most:
- Mastic round period door frames that has failed
- Weathered mastic on the most exposed windows
- Gaps where the frame meets the masonry
- Mastic dropping out of the joint
For an older house near a landmark such as Church of St Francis, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before you book
- Whether you can choose the colour
- How long the guarantee is
- What insurance they hold
- What preparation is included
Work for landlords, hotels and businesses
For anyone letting property in or around Welborne, several properties can be quoted together. Send us the addresses and the work at each.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Why act early in Welborne
Cement-based fillers and modern sealants do not always suit a period surround. Sand mastic matches what was there and that can be important for listed homes. In a small place like Welborne, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Leaving a failed joint normally makes the job bigger, not smaller. If you’re unsure, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What you get with us
- Every job guaranteed for a year
- Anti-fungal silicone where joints get wet
- An ARBOMaster approved applicator
- 180+ five-star Google reviews
See our cost guide or what customers say.
How it works
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. For a village or hamlet like Welborne, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Let us know about earlier repairs to the joints
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
Ask for a quote
Need a quote? Please phone 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
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.