Hampshire · England
Sand Mastic in Hart Plain
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Hart Plain, with a one-year guarantee on every job. Call for a quick quote.
- Gaps round a timber door in stone or brick
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
About our sand mastic in Hart Plain
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. We work on timber door frames, stone surrounds and sash and case windows, and people most often call us about tired mastic found when preparing windows for paint and failed mastic on an exposed elevation.
In smaller places like Hart Plain, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Hart Plain (PO8, PO7)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
Before booking, it’s worth knowing the limits:
- Crumbling stone or brickwork round the window
- Broken panes
- Decisions on consent for listed homes
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
Surfaces we seal
- Period & listed homes
- Timber door frames
- Brick reveals
- Tenement windows
- Stone surrounds
- Sash and case windows
Aftercare tips
To keep the joints looking good and working properly:
- Don’t run silicone over sand mastic
- Take care around the mastic when scraping paint
- Renew mastic before redecorating the windows
- Keep sills and gutters clear so water drains away
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
What affects the quote in Hart Plain
We do not publish a price list. The quote depends on:
- The size of the job
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- Working hours on commercial sites
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
What to tell us when you ask for a quote:
- Where the job is, and your postcode
- Whether it’s a home or a business
- What’s wrong with the joints now
- Pictures of the joints, sent by email
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or email us.
What happens if it’s left?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic suits the building and blends with the stone or brick. Homes in smaller places like Hart Plain can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why Hart Plain clients choose us
- Arbo and Everbuild products
- Anti-fungal silicone where joints get wet
- Domestic, commercial and hotel work
- 180+ five-star Google reviews
Read our cost guide and customer reviews.
Towns and villages near Hart Plain
Also in Hart Plain
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself normally takes a few hours per window, depending on the condition of the joints, depending on the amount of work. In a smaller place like Hart Plain, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- 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 is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
- Let us know about stairs, lifts or work at height
Get a quote
Call for a quick quote, 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.
Related advice
Your questions about sand mastic in Hart Plain
Do you cover smaller places like Hart Plain?
Yes, Hart Plain is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you work for landlords with property near Rowlands Castle station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Are you fully insured?
Yes. We’re fully insured for domestic and commercial work.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Where are you based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick normally suit sand mastic and newer frames usually get a flexible sealant.
Sand mastic in Hart Plain: local notes
With historic houses such as Warblington Castle (about 4.5 miles south-east) nearby, there’s older building stock in the area around Hart Plain as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Hart Plain Infant School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. In the older streets around The Hart Plain Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
Hart Plain is about 1 mile north of Waterlooville, in Hampshire. Homes, rented property, offices and hotels in Hart Plain can book us for sand mastic. The work is guaranteed for a year. 683 places in Hampshire are on our list, from the larger towns to small villages. Our Portsmouth page covers work nearby (6 miles or so).
Work in PO8 and PO7 works the same way as everywhere else we cover. If you need sand mastic at a property on Milton Road, King's Road and Eagle Avenue or anywhere close by, our applicators can take on the job. Other places close to Hart Plain include Cowplain (1 mile north-east), Waterlooville (1 mile south), Soake (1 mile west), Furzeley Corner (2 miles west) and Purbrook (2 miles south). Further out, we also cover Gosport (8 miles south-west), Havant (3 miles south-east), Eastleigh (15 miles west), Fareham (8 miles south-west), Hedge End (12 miles west) and Petersfield (9 miles north-east).
Near you in Hart Plain
Typical jobs here are in homes near The Cowplain School and the streets around them. The closest station to Hart Plain is Rowlands Castle station, roughly 3.1 miles east. Other landmarks nearby include Havant Museum (3.9 miles south-east) and Clanfield Earthwork (4.1 miles north-east). For a walk, there’s Southmoor Nature Reserve and Windmill Hill.
When to call us in Hart Plain
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
People normally contact us after spotting something like this:
- Gaps where the frame meets the masonry
- Silicone on a period window that looks wrong
- Wind and rain getting in round a sash window
- Mastic round period door frames that has failed
Letting a property close to Rowlands Castle station? Then any sash windows need sound mastic to keep draughts and rain out.
Before booking anyone
- Whether VAT is included
- What the cure time is
- Are they insured?
- Who turns up on the day