West Berkshire · England
Window Mastic in Mortimer
Mastic around window and door frames, sills and patio doors for Mortimer, backed by a one-year guarantee. Ask us for a quote.
- Whistling draughts around closed windows
- Cracked internal joints between frame and plaster
- Old mastic that has gone black or come away
How we handle window mastic in Mortimer
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We work on uPVC windows, timber windows & doors and aluminium frames, and the jobs we see most are old mastic that has gone black or come away and cracked sealant at the sill ends.
In a smaller place like Mortimer, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Mortimer (RG7)
- Region
- West Berkshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. In an older home around Mortimer, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What you get with us
- We leave the area clean and tidy
- 20+ years of sealant experience
- Anti-fungal silicone where joints get wet
- A sealant colour to suit the surroundings
Take a look at how sealant jobs are priced or what customers say.
Nearby places to Mortimer
Also in Mortimer
How the job changes by surface
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We’ll point out any rot we find, as a joiner will need to deal with it.
Patio & French doors
Water at the foot of a door frame isn’t always the mastic: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
What happens on the day
The work is kept neat and contained to the area we are working on. Expect the work to take a few hours for a few frames, or a day or more for a whole house, and we explain the cure time before we leave. For a job in Mortimer, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Let us know if you’ve seen damp or leaks
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
Getting a quote
For window mastic in Mortimer, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
Related advice
Mortimer homes and the weather
With historic houses such as Stratfield Saye House (about 3.6 miles south-east) nearby, there’s older building stock in the area around Mortimer as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Mortimer station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you live in an older home near Mortimer Methodist Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Mortimer is about 4 miles north-east of Tadley, in West Berkshire. Anywhere in RG7, we cover window mastic for homes and businesses. 155 places in West Berkshire are on our list, from the larger towns to small villages. There’s also a page for Reading, roughly 6 miles from Mortimer.
Every address in RG7 is covered for window mastic, from the main roads to the quietest streets. Whether your property is on The Street, Croft Road and Leigh Field or anywhere close by, we can help. Close by, we work in Stratfield Mortimer (1 mile east), Mortimer West End (1 mile south-west), Goddard's Green (2 miles north-east), Burghfield Common (2 miles north) and Wokefield (2 miles north-east). Larger places within reach include Newbury (11 miles west), Thatcham (8 miles west), Speenhamland (11 miles west), Spencers Wood (4 miles east), Calcot (5 miles north) and Shaw (11 miles west).
What’s near Mortimer
In Mortimer, that means homes and buildings near The Willink School, The Willink School and Padworth Common Local Nature Reserve. The closest station to Mortimer is Mortimer station, about 1.4 miles east. Other landmarks nearby include Calleva Museum (2 miles south-west) and Beaumys Castle (3.7 miles east). Green spaces nearby include Hosehill Lake.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
When something else is needed
It helps to know what we cannot do too:
- A failed sealed unit that has misted up
- Broken hinges, locks or handles
- Rotten timber, which needs a joiner first
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
What we seal
- Window sills
- uPVC windows
- Timber windows & doors
- Patio & French doors
- Aluminium frames
- Composite doors
Common problems we fix in Mortimer
Water runs down the glass onto the sill, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
Signs it’s time to call us include:
- Draughty joints inside around the window
- White mastic on grey or black frames
- Water coming in at the bottom corners of a door
- Mastic that is falling out in pieces
For site and facilities teams at buildings such as Mortimer St John's C.E. Infant School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How hidden problems are handled
- How long to leave it before use
- How much experience the applicator has
- Whether all the old sealant comes out first
FAQs for Mortimer
Is Mortimer within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do window mastic in Mortimer?
Yes. We work across London and the South East, and Mortimer is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
How many windows can you do in a day?
That depends on the number of frames, how they’re reached and the state of the old mastic. You will know the timing when we quote.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can I paint over the new sealant?
Most silicone can’t be painted. Let us know beforehand, and we will use a paintable product where it suits.
Does the work come with a guarantee?
Yes, for 12 months. A yearly look at the joints helps them last.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all.
How we quote for window mastic
The quote reflects the job in front of us. We take into account:
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- Working hours on commercial sites
- Whether the work is at height
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What we need to know
What to tell us when you ask for a quote:
- The type of property
- How many joints, rooms or windows are involved
- A few pictures by email, if you can
- Any access issues, like height or stairs
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.