Hampshire · England
Window & door mastic in Forestside, Hampshire
Mastic around window and door frames, sills and patio doors in Forestside, with a 12-month guarantee on every job. Call for a quick quote.
- Rushed sealant from a window installation
- Cold air getting in at the frame edge
- Mastic that’s falling out in pieces
Leave it or put it right?
Failed mastic isn’t a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we will tell you. In a small place like Forestside, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
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 the work is at height. Your quote takes all of that into account.
What you get with us
- Fully insured
- An ARBOMaster approved applicator
- Domestic, commercial and hotel work
- 20+ years of sealant experience
Read our cost guide and customer reviews.
Window mastic for homes and businesses in Forestside
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that cannot move properly, so deep gaps get backing rod first. The sealant then grips the two sides it should. We work on composite doors, timber windows & doors and patio & French doors, and common reasons people get in touch are cracked sealant at the sill ends and cold air getting in at the frame edge.
In a village or hamlet like Forestside, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
There’s a 12-month guarantee on every job, large or small.
- Place
- Forestside (PO9)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Forestside
Housing providers, facilities teams and property managers book us too in Forestside and across Hampshire. Several sites can go on one quote, and we’re fully insured for the work.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
What we cannot put right
To be straight with you, some problems need a different trade:
- Draughts through the window seals rather than the frame
- Damp problems in the wall away from the window
- Rotten timber, which needs a joiner first
If in doubt, phone 0345 464 0079 or email us and we will say what we think.
What we seal
- uPVC windows
- Timber windows & doors
- Window sills
- Aluminium frames
- Patio & French doors
- Composite doors
Forestside: your questions answered
Is Forestside in your area for window mastic?
Yes, Forestside is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Do you work for landlords with property near Rowlands Castle station?
Yes. We work for landlords and agents as well as householders, and several properties can go on one quote. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
How long will my window job take?
A few frames take a few hours. You’ll get a timescale with the quote.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Do you have insurance?
Yes. We’re fully insured, and we can confirm the details when we quote.
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.
Can I paint over the new sealant?
Most silicone cannot be painted. Let us know beforehand, and we will use a paintable product where it suits.
Surface by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
What affects the cost of window mastic
You’ll get a clear quote before any work starts. It’s based on:
- The type of sealant required
- When we can work, for business premises
- Access and height
- Mould in or behind the old joints
Combining jobs into one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
What we need to know
To help us quote quickly, let us know:
- What’s wrong with the joints now
- Photos by email, if that is easy
- Any previous sealing or DIY work
- Where the job is, and your postcode
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
How it works
The work is kept neat and contained to the area we’re working on, so you can get on with your day. Expect the work to take most of a day for a typical house, less for a few frames, and we explain the cure time before we leave. Somewhere like Forestside needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we’re working on
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job.
Read more
Frames and glazing around Forestside
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. Historic houses like Uppark (about 3.2 miles north) are a reminder that the area around Forestside 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 is traditional sand mastic.
Rented homes near Rowlands Castle station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. In the older streets around Christ Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
Forestside is about 4 miles east of Horndean, in Hampshire. Homes, rented property, offices and hotels in Forestside can book us for window mastic. The work is guaranteed for a year. We cover 683 towns and villages across Hampshire, from the larger towns to small villages. Portsmouth is on our list too, around 10 miles away.
We cover every part of PO9 for window mastic and the streets around it. Streets in the area include Lodge Lane and Forestside. If you are just outside Forestside, we cover West Marden (1 mile north-east), Chalton (3 miles north-west), Blendworth (3 miles west), Buriton (5 miles north) and Nursted (5 miles north). Larger places within reach include Gosport (13 miles south-west), Havant (5 miles south-west), Fareham (13 miles west), Horndean (4 miles west), Waterlooville (6 miles west) and Petersfield (7 miles north).
What’s near Forestside
In Forestside, that means homes and buildings near Stansted Park, among other places. The closest station to Forestside is Rowlands Castle station, about 2.2 miles south-west. Other landmarks nearby include Clanfield Earthwork (4 miles north-west) and Havant War Memorial Hospital (5 miles south-west). For a walk, there’s Compton Down and Kingley Vale National Nature Reserve.
Also near Forestside
Other services in Forestside
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.