Medway · England
Window & door mastic in Upper Upnor, Medway
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Upper Upnor. Fully insured, ARBOMaster approved and guaranteed for a year.
- Draughty joints inside around the window
- Cold air getting in at the frame edge
- Untidy mastic left by window fitters
Window mastic in Upper Upnor
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. We work on window sills, patio & French doors and aluminium frames, and people most often call us about mastic that has split away from the wall and rushed sealant from a window installation.
Homes in small places like Upper Upnor often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
Every job is covered by our one-year guarantee.
- Location
- Upper Upnor (ME2)
- Wider area
- Medway
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for window mastic in Upper Upnor
The quote reflects the job in front of us. We take into account:
- Any working-time requirements on site
- How many areas need sealing
- The old material and how stubborn it is
- How easy the joints are to reach
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- A few pictures by email, if you can
- Whether it has been sealed before
- Access, such as stairs, a lift or height
- The problem you’ve noticed
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, ring 0345 464 0079 or drop us an email.
What we are called out for in Upper Upnor
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
Signs it’s time to call us include:
- Draughty joints inside around the window
- Untidy mastic left by window fitters
- Gaps where the sill meets the wall
- Mastic that’s falling out in pieces
If you let a flat or house near Strood station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Questions to ask before you book
- Who does the work, and how experienced they are
- Which colour the sealant will be
- Whether the sealant suits the joint
- Are they insured?
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What happens if it’s left?
If you’re painting or rendering, reseal at the same time. Fresh joints finish the job neatly. Older cottages and farmhouses around Upper Upnor can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
What you get with us
- Trusted Arbo and Everbuild sealants
- Rated 4.9 stars on Google
- Approved under the ARBOMaster scheme
- 12-month guarantee on every job
Read our cost guide or our reviews.
How the visit works
You don’t need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the job takes a few hours for a handful of frames, longer for a whole house in most cases. Somewhere as small as Upper Upnor, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Getting ready for the visit
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
- Mention any parking rules near the property
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Read more
Upper Upnor homes and the weather
Upper Upnor is close to 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 window and door frames, which can dry out and crack sooner where a building faces the weather. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to St Philip & St James include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in. For site and facilities teams at buildings such as Wainscott Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Upper Upnor is about 2 miles north-east of Rochester, in Medway. Wherever you are in the ME2 postcode area, we can carry out window mastic at your property. 68 places in Medway are on our list, from the larger towns to small villages. There’s also a page for Chelmsford, roughly 23 miles from Upper Upnor.
Work in ME2 works the same way as everywhere else we cover. Whether your property is on High Street, Upnor Road and Castle Street or a nearby road, our applicators can take on the job. Nearby, we also carry out window mastic in Lower Upnor (1 mile north-east), Wainscott (1 mile north-west), Chattenden (1 mile north), Hoo St Werburgh (2 miles north-east) and Cooling Street (3 miles north). Further out, we also cover Gillingham (3 miles south-east), Chatham (3 miles south), Rainham (5 miles south-east), Luton (3 miles south), Park Wood (5 miles south-east) and Lordswood (5 miles south).
Around Upper Upnor
In Upper Upnor, that means homes and buildings near The Kings Arms, Lower Lines Park and Waterfront University Technical College and the streets around them. Other local landmarks include Former Ordnance Store At Chatham Gun Wharf (1.4 miles south) and Waterfront UTC (1.3 miles south-east). Upper Upnor’s nearest station is Strood station, roughly 1.2 miles south-west of the centre. Other landmarks nearby include French Hospital (1.5 miles south-west) and Pentagon Shopping Centre (1.6 miles south). For a walk, there’s Gad's Hill and Rede Common.
Towns and villages near Upper Upnor
More services for Upper Upnor
Aftercare tips
After the cure time, these simple habits help:
- Clear any debris from frame drain holes
- Don’t aim a pressure washer at the joints
- Ventilate rooms so frames do not stay wet inside
- Paint up to the joint, not over it
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
Different surfaces, different methods
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We will point out any rot we find, as that is a job for a joiner.
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain can’t run into the wall.
Common questions in Upper Upnor
Do you cover smaller places like Upper Upnor?
Yes, Upper Upnor is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
I let a flat near Strood station. Can you help?
Yes. We work for landlords and agents as well as householders. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status.
Are you fully insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Where is Mr Mastic based?
We’re based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.