Medway · England
Lower Upnor Sand Mastic
Specialist sand mastic for Lower Upnor: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Weathered mastic on the most exposed windows
- Mastic dropping out of the joint
- Draughts and rain around sash boxes
Sand mastic for homes and businesses in Lower Upnor
Traditional burnt sand mastic that sits naturally against stone and brick. It’s a good fit for period properties, where modern sealant can look out of place. We’re often asked to deal with a silicone bead on a sash window that spoils the look and draughts and rain around sash boxes, across tenement windows, sash and case windows and brick reveals.
Homes in small places like Lower Upnor 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.
All our work comes with our one-year guarantee.
- Where
- Lower Upnor (ME2)
- Region
- Medway
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What sand mastic looks like in Lower Upnor
Lower Upnor 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.
For site and facilities teams at buildings such as Chattenden Primary School, the mastic around its windows and doors needs looking after like any other building’s. Homes close to St Philip & St James include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Lower Upnor is about 2 miles north-east of Rochester, in Medway. Jobs in Lower Upnor get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Lower Upnor is one of 68 places in Medway we cover for sand mastic. There’s also a page for Chelmsford, roughly 23 miles from Lower Upnor.
Here we cover the ME2 postcode area for sand mastic. If you need sand mastic at a property on Galleon Way, Cutter Close and Schooner Walk or anywhere close by, we can help. If you are just outside Lower Upnor, we cover Upper Upnor (1 mile south-west), Chattenden (1 mile north), Wainscott (1 mile west), Hoo St Werburgh (2 miles north-east) and Cooling Street (2 miles north). We also work in nearby towns such as Gillingham (3 miles south-east), Chatham (4 miles south), Rainham (5 miles south-east), Strood (3 miles south-west), Luton (3 miles south) and Park Wood (5 miles south-east).
What’s near Lower Upnor
Typical jobs here are in homes near Former Ordnance Store At Chatham Gun Wharf, The Hundred of Hoo Academy and Waterfront University Technical College, among other places. Nearby too are Lower Lines Park (1.3 miles south-east) and The Ship pub (within half a mile east). The closest station to Lower Upnor is Strood station, roughly 1.6 miles south-west. Well-known places in the area include Upnor Castle (under half a mile south) and Pentagon Shopping Centre (1.9 miles south). Open spaces near Lower Upnor include Rede Common and Gad's Hill.
Places near Lower Upnor
More services for Lower Upnor
Aftercare tips
So the new joints stay in good condition:
- Do not run silicone over sand mastic
- Find out about consent before window work on a listed home
- Ask us before painting near the mastic
- Ask a joiner to look at soft timber first
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Quotes for sand mastic in Lower Upnor
There’s no set price list, because jobs vary so much. The quote depends on:
- Access and height
- How many areas need sealing
- The old material and how stubborn it is
- How much there is to do
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- A few photos by email, if you can
- Any access issues, like height or stairs
- The rough size of the job
- The type of property
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or send us an email with the details.
Why it’s worth doing now in Lower Upnor
Not every filler suits an old window surround. Sand mastic is the like-for-like choice and that can be important for listed homes. Older cottages and farmhouses around Lower Upnor can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not guesswork. That is why we ask a few questions first and send you a clear quote before any work starts.
Why Lower Upnor customers choose us
- Full insurance on every job
- One-year guarantee on every job
- Old sealant always removed completely
- Homes, businesses and hotels
Read how sealant jobs are priced and our reviews.
The process
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours per window, depending on the condition of the joints. Somewhere like Lower Upnor needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
Getting a quote
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Read more
Surface by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Lower Upnor: your questions answered
Do you work for landlords with property near Strood station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Is sand mastic in a coastal place like Lower Upnor any different?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are generally the first to need attention.
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.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Do you offer different sealant colours?
Most of the time, yes. We will explain which colours are available and agree one before work begins.
How long does sand mastic take?
Most jobs take anything from a few hours to a full day, depending on how many windows, including the preparation. We will confirm how long when we quote.
For landlords and businesses
We also work for property managers and facilities teams in Lower Upnor and across Medway. Several sites can go on one quote, and we are fully insured.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Common problems we fix in Lower Upnor
Rain on the window surround works into any crack and loosens it further. Exposed elevations normally fail first.
If you can see any of these, it’s time to have the joints looked at:
- Cement or filler used on old window joints that has cracked
- Failed mastic on an exposed elevation
- Cracked mastic round a front door frame
- Mastic dropping out of the joint
Letting a property close to Strood station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- Whether VAT is included
- How long to leave it before use
- How hidden problems are handled
- What insurance they hold