West Sussex · England
Window & door mastic in Compton, West Sussex
Window mastic across Compton and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Draughty joints inside around the window
- Sealant in the wrong colour for the frame
- Gaps left after new windows were fitted
How we handle window mastic in Compton
From a single sill to a whole house of windows, you’ll get a clear quote before any work starts. Just call 0345 464 0079 or email us and tell us how many frames there are and how they’re reached for window mastic in Compton. If you’re dealing with draughts coming in around windows and doors and hard, cracked sealant around windows, we can help.
Mastic can only go onto a dry, clean joint, so window work in Compton is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Location
- Compton (PO18)
- Region
- West Sussex
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Compton homes and the weather
Historic houses like Uppark (about 1.8 miles north) are a reminder that the area around Compton has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
Schools such as Compton and Up Marden CofE Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near The Parish Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Compton is about 5 miles east of Horndean, in West Sussex. Every kind of property in Compton is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Our West Sussex coverage runs to 371 places, and Compton is one of them. Our Portsmouth page covers work nearby (11 miles or so).
Work in PO18 works the same way as everywhere else we cover. Whether your property is on Church Lane and School Lane or a nearby road, our applicators can take on the job. We also cover the places around Compton: East Marden (2 miles east), South Harting (3 miles north), East Harting (3 miles north-east), Chilgrove (4 miles east) and Elsted (4 miles north-east). Larger places within reach include Bognor Regis (13 miles south-east), Chichester (8 miles south-east), Selsey (14 miles south), Emsworth (6 miles south), Portfield (9 miles south-east) and Yapton (15 miles south-east).
Around Compton
Around Compton, our work takes us to homes and buildings near The Coach And Horses Public House and the streets around them. The nearest railway station is Rowlands Castle station, roughly 3.6 miles south-west of the centre. Nearby you will also find Petersfield Community Hospital (5.7 miles north) and Clanfield Earthwork (4 miles west). Not far away are Kingley Vale National Nature Reserve and Compton Down.
Surface by surface
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the new bead is laid against the frame and the wall.
Composite doors
Composite doors are normally hung in an uPVC-type frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- Whether old sealant or filler has to be cut out
- The amount of work
- Which sealant suits the joint
- Any working-time requirements on site
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Helping us quote
When you call or email, it’s useful to know:
- The address or postcode of the job
- Roughly how big the job is
- Any access issues, like height or stairs
- If someone has resealed it before
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Landlords, agents and businesses in Compton
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
How the visit works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a morning for a couple of windows and a door. Somewhere like Compton needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Before we arrive
- Mention any parking rules near the property
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
Ask for a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. Photos by email help us understand the job.
Related advice
What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Rotten timber, which needs a joiner first
- A sash or casement that will not close properly
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Window sills
- Timber windows & doors
- Composite doors
- uPVC windows
- Patio & French doors
- Aluminium frames
Compton: your questions answered
Can you help a landlord with a rental near Rowlands Castle station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Do you cover Compton for window mastic?
Yes. We work across London and the South East, and Compton is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Do you seal inside as well as outside?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
Is it OK to seal over old sealant?
No. The old sealant always comes out first.
Is the new sealant paintable?
It depends on the sealant. Some hybrid sealants can be painted; silicone cannot. Tell us if you’re decorating and we’ll choose accordingly.
How long before the joint can be used?
Cure times vary by product. We tell you how long to leave it before we go.
How long will my window job take?
It depends on access, the old mastic and the size of the frames. We will tell you how long your job needs when we quote.
Can you reach windows above the ground floor?
Yes, where it’s safe. For high or awkward windows, we’ll tell you what access is needed.
Leave it or put it right?
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. Older cottages and farmhouses around Compton can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email and we’ll talk you through it.
Why choose Mr Mastic in Compton
- Every job guaranteed for a year
- ARBOMaster approved applicator
- Colour picked to suit the job
- Rated 4.9 stars on Google
Read how sealant jobs are priced and our reviews.
Nearby places to Compton
What else we do in Compton
When to call us in Compton
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. If the sealant can’t stretch, it splits.
It’s worth asking for a quote if you see:
- Leaking joints at the ends of sills
- Draughts coming in around windows and doors
- Draughty joints inside around the window
- Gaps left after new windows were fitted
Rented homes near Rowlands Castle station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
What to look for in a quote
- Which colour the sealant will be
- Who does the work, and how experienced they are
- What happens if the job turns out different
- What guarantee comes with the work