Hampshire · England
Southwood Window Mastic
Mastic around window and door frames, sills and patio doors for homes and businesses in Southwood and across Hampshire. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Old mastic that has gone black or come away
- Sealant in the wrong colour for the frame
- Untidy mastic left by window fitters
Window mastic in Southwood, done properly
Around Southwood we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. Typical jobs include untidy mastic left by window fitters and old mastic that has gone black or come away, on timber windows & doors, patio & French doors and aluminium frames.
Homes around Southwood range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or email us.
- Location
- Southwood (GU14, GU51)
- Region
- Hampshire
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- The product the joint needs
- Working hours on commercial sites
- Access and height
- Whether old sealant or filler has to be cut out
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
When you call or email, it’s useful to know:
- Any access issues, like height or stairs
- Where the property is
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear quote before any work starts.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for property managers and facilities teams in Southwood and across Hampshire. We can quote a run of properties together, and we’re fully insured for the work.
Signs you need window mastic in Southwood
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, and a gap filled solid cannot flex. Backing rod sets the right depth.
Keep an eye out for any of the following:
- Sealant in the wrong colour for the frame
- Cracked sealant at the sill ends
- Old mastic that has gone black or come away
- Hard, cracked sealant around windows
Managing a site like Southwood Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- Which colour the sealant will be
- When the joint can take water or movement
- Whether they’re fully insured
- How much experience the applicator has
Frames and glazing around Southwood
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Fleet station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Homes close to St John the Baptist include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Southwood is about 1 mile west of Farnborough, in Hampshire. Homes, rented property, offices and hotels in Southwood can book us for window mastic, old or new, large or small. Every job comes with our one-year guarantee. Our Hampshire coverage runs to 683 places, and Southwood is one of them. Our Reading page covers work nearby.
All of GU14 and GU51 is covered for window mastic, from the main roads to the quietest streets. Streets in the area include Fleet Road, Kennels Lane and Summit Avenue, and we cover them all. If you are just outside Southwood, we cover Cove (1 mile north), Farnborough (1 mile east), North Camp (2 miles east), Mytchett (3 miles east) and Aldershot (3 miles south-east). Larger places within reach include Basingstoke (13 miles west), Alton (12 miles south-west), Yateley (4 miles north-west), Bordon (13 miles south), Hook (7 miles west) and Popley (12 miles west).
Local landmarks in Southwood
Locally, jobs take us to homes and businesses close to National Aerospace Library, Ancells Farm Park and Cove School and the streets around them. For rail, the closest station is Fleet station, about 1.5 miles west of the centre. Well-known places in the area include Hart Shopping Centre (2.1 miles west) and Royal Army Dental Corps Historical Museum (2.6 miles south-east). Open spaces near Southwood include Aunt's Pool and Ball Hill.
Towns and villages near Southwood
Also in Southwood
The process
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. It normally takes anything from an hour or two to a full day, depending on how many frames there are. Parking around Southwood is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Before we arrive
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
Get a quote
If you are in Southwood and need window mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Read more
Aftercare tips
So the new joints stay in good condition:
- Don’t paint over the silicone
- Use gentle cleaners on frames and sealant
- Air rooms to keep condensation down around windows
- Look round the frames every year or so
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
Surface by surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones aren’t used, as they can attack some metals. Neutral-cure sealant is the safe choice.
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
When it isn’t the sealant
Before you book, it’s worth knowing the limits too:
- Worn gaskets, brush seals or a door that has dropped
- Rotten timber, which needs a joiner first
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
Where we work in Southwood
- Composite doors
- uPVC windows
- Patio & French doors
- Aluminium frames
- Timber windows & doors
- Window sills
Common questions in Southwood
Will you come out to Southwood?
Yes. Southwood is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for landlords with property near Fleet station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Is the work guaranteed?
Yes. Each job is covered for 12 months.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can I paint over the new sealant?
Most silicone cannot be painted. Let us know beforehand, and we’ll use a paintable product where it suits.