Buckinghamshire · England
The City Window Mastic
Window mastic in The City from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Draughty joints inside around the window
- Damp patches on the reveal after heavy rain
- Untidy mastic left by window fitters
What the job involves on each surface
Aluminium frames
Aluminium moves with heat, and the frames are often slimmer than uPVC. A tidy bead in anthracite grey, black or a matching colour suits the frame.
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
Window mastic in The City
The new joint doesn’t have to be white. White, brown, anthracite grey, black and clear sealants are all available, so the line suits the frame instead of standing out. If you’re dealing with draughty joints inside around the window and rushed sealant from a window installation, we can help, on window sills, timber windows & doors and composite doors alike.
Homes in small places like The City 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.
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.
- Where
- The City (HP14)
- Wider area
- Buckinghamshire
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Leave it or put it right?
Draughts and leaks don’t always mean new windows. If the frames and glass are in good order, resealing the joints is often all that is needed. Problems with the glass or gaskets are for a window company, and we will say so. Where a wall is exposed, as many are in small places like The City, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
What it costs depends on the amount of work, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- Every job guaranteed for a year
- Trusted Arbo and Everbuild sealants
- White, clear, grey or another colour, product permitting
Take a look at our cost guide or our reviews.
Signs you need window mastic in The City
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant cannot stretch, it splits.
These are the problems we are asked about most:
- Cracked sealant at the sill ends
- Gaps left after new windows were fitted
- Hard, cracked sealant around windows
- Old mastic that has gone black or come away
If you live in an older home near Church of St Paul, the joint between an old wall and a newer frame is generally the first place rain gets in.
What to look for in a quote
- Whether all the old sealant comes out first
- Who turns up on the day
- Are they insured?
- What preparation is included
Honest limits
New sealant cannot fix everything, and we’ll tell you before any work starts. It won’t solve:
- Penetrating damp from a failed cavity tray or render
- Condensation trapped between the panes
- A frame that has rotted at the joint
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Where we work in The City
- uPVC windows
- Window sills
- Patio & French doors
- Aluminium frames
- Composite doors
- Timber windows & doors
The City homes and the weather
With historic houses such as West Wycombe Park House (about 2.7 miles south-east) nearby, there’s older building stock in the area around The City as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Saunderton station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. Managing a site like Radnage Church of England Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
The City is about 5 miles north-west of High Wycombe, in Buckinghamshire. Our applicators cover window mastic for homeowners, landlords and businesses in The City and nearby, as part of our work across Buckinghamshire. Our Buckinghamshire coverage runs to 263 places, The City among them. Our Reading page covers work nearby, about 15 miles away.
Every address in HP14 is covered for window mastic. If you need window mastic at a property on Bottle Square Lane, Radnage Common Road and Green Lane or a nearby road, our applicators can take on the job. We also cover the places around The City: Waterend (1 mile west), Beacon's Bottom (1 mile south-west), Radnage (1 mile north), Bennett End (1 mile north-west) and Green End (1 mile south-east). Larger places within reach include Aylesbury (11 miles north), High Wycombe (5 miles south-east), Chesham (11 miles east), Marlow (7 miles south-east), Amersham (11 miles east) and Beaconsfield (10 miles east).
Landmarks near The City
In The City, that means homes and buildings near The Crown pub, among other places. For rail, the closest station is Saunderton station, roughly 1.8 miles north-east of the centre. Well-known places in the area include Wycombe Hospital (5 miles south-east). Open spaces near The City include Yoesden and Bald Hill.
How we quote for window mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- How many areas need sealing
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
- When we can work, for business premises
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
How it works
There is not much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes anything from an hour or two to a full day, depending on how many frames there are, including the tidy-up. For a village or hamlet like The City, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will explain what’s involved.
Read more
Towns and villages near The City
What else we do in The City
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
FAQs for The City
Do you cover The City for window mastic?
Yes. Our work covers London and the South East, and The City is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
I let a flat near Saunderton station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or email us with the details for a clear quote.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Do you have sealant for grey or black windows?
Yes, in most cases. Mention the frame colour when you ask for a quote and we will use the nearest match.
Is the new sealant paintable?
Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
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.
What does window mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.