Southampton · England
Window & door mastic in Freemantle, Southampton
Mastic around window and door frames, sills and patio doors for Freemantle, backed by a 12-month guarantee. Ask us for a quote.
- Mastic that has split away from the wall
- Leaking joints at the ends of sills
- Old mastic that has gone black or come away
Window mastic in Freemantle
Around Freemantle we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. If you are dealing with water coming in at the bottom corners of a door and gaps left after new windows were fitted, we can put it right, on timber windows & doors, aluminium frames and window sills alike.
Around Freemantle, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows.
You get a 12-month guarantee, the same in Freemantle as everywhere else we work.
- Where
- Freemantle (SO15, SO16, SO17)
- Region
- Southampton
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
When we arrive, we look over the joints with you first, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. The work usually takes a few hours for a handful of frames, longer for a whole house. For a job in Freemantle, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Mention any sign-in or site rules at work premises
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will explain what’s involved and send you a clear quote.
Related advice
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Damp coming through the wall itself rather than the frame joint
- A frame that has rotted at the joint
- Condensation trapped between the panes
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before booking.
Surfaces we seal
- uPVC windows
- Patio & French doors
- Aluminium frames
- Window sills
- Timber windows & doors
- Composite doors
Window mastic in Freemantle: local notes
Freemantle is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. With historic houses such as Southampton Tudor House and Garden (about 1.2 miles south-east) nearby, there’s older building stock in the area around Freemantle as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Millbrook (Hants) station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. In the older streets around Christ Church, the joint between an old wall and a newer frame is normally the first place rain gets in.
Freemantle is about 1 mile west of Southampton, in Southampton. Homes, rented property, offices and hotels in Freemantle is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Across Southampton, we cover 40 places, Freemantle among them.
Every address in SO15, SO16 and SO17 is covered for window mastic, from the main roads to the quietest streets. That includes homes and businesses on May Road, Park Road and Pitt Road and the roads around them. Main roads around Freemantle include the A33, which makes travel easy. We also cover the places around Freemantle: Shirley (1 mile north), Regents Park (1 mile north-west), Millbrook (1 mile west), Maybush (2 miles north-west) and Coxford (2 miles north-west). Further out, we also cover Townhill Park (3 miles north-east), Midanbury (3 miles east), Thornhill (4 miles east), Chartwell Green (4 miles east), Harefield (4 miles east) and Itchen (3 miles east).
Near you in Freemantle
We work in homes and buildings around St Anne's Catholic School, Blechynden Terrace Park and The Brass Monkey pub, among other places. Freemantle has its own railway station: Millbrook (Hants) station. Well-known places in the area include Western Community Hospital (1.3 miles north-west) and Foresters Museum & Archive (under half a mile east). The countryside around Freemantle includes Testwood Lakes.
Nearby places to Freemantle
Also in Freemantle
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Keep timber frames painted
- Clear any debris from frame drain holes
- Keep solvents and bleach off the sealant
- Use gentle cleaners on frames and sealant
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Do you need window mastic in Freemantle?
Mastic ages in the weather. Sunlight dries the surface out, until it loses its stretch and starts to crack.
Keep an eye out for any of the following:
- Rushed sealant from a window installation
- Old mastic that has gone black or come away
- Draughty joints inside around the window
- White mastic on grey or black frames
Managing a site like Freemantle Church of England Community Academy? Then larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- What the quote includes, VAT included or not
- How the colour is chosen
- Whether the sealant suits the joint
- Are they insured?
Should I try it myself first?
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 doesn’t work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
What affects the quote in Freemantle
Call for a quick quote. The main things that affect it are:
- Any mould that needs treating
- The old material and how stubborn it is
- The type of sealant required
- The amount of work
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- What’s wrong with the joints now
- The address or postcode of the job
- How we’d reach the joints
- Photos by email, if that is easy
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we’ll take it from there.
Common questions in Freemantle
Is window mastic in a coastal place like Freemantle any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
I let a flat near Millbrook (Hants) station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or email us with the details for a clear quote.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Where is Mr Mastic based?
We work from Crawley. We cover Freemantle and the rest of Southampton, along with the rest of our area.
Do you seal inside as well as outside?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
Will resealing my frames help with draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or send us an email.
Work for landlords, hotels and businesses
For anyone letting property in or around Freemantle, several properties can go on one quote. Just tell us the addresses and what each one needs.
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured.