Hampshire · England
Window & door mastic in Frogmore, Hampshire
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Frogmore. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cracked internal joints between frame and plaster
- Cracked or shrunken mastic around the frame
- White mastic on grey or black frames
Window mastic in Frogmore
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. If the draught is through the window seals instead, we will tell you. We work on uPVC windows, composite doors and patio & French doors, and the jobs we see most are draughty joints inside around the window and leaking joints at the ends of sills.
Homes around Frogmore range from older properties to newer houses, and their windows range just as widely. The right sealant depends on the frame and on what it sits in.
All our work is covered by a one-year guarantee.
- Location
- Frogmore (GU17, GU47, GU46)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Different surfaces, different methods
Composite doors
A composite door generally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that without cracking.
Frogmore: your questions answered
I let a flat near Sandhurst station. Can you help?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Will you come out to Frogmore?
Yes, Frogmore is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Are you insured?
Yes. Full insurance covers our work.
Can you do the inside joint as well?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will tell you what we are using.
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Keep solvents and bleach off the sealant
- Paint up to the joint, not over it
- Keep drainage slots and sill grooves clear
- Keep jet washers away from the mastic
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams in Frogmore and across Hampshire. We can quote a run of properties together, and we’re fully insured.
What window mastic looks like in Frogmore
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Sandhurst station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. For an older house near a landmark such as St Barnabas Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Schools such as Frogmore Junior School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Frogmore is about 1 mile south-west of Sandhurst, in Hampshire. We provide window mastic to householders, landlords and businesses in Frogmore and the surrounding area. Frogmore is one of 683 towns and villages in Hampshire where we work for window mastic. You can also see our page for Reading, about 11 miles away.
Every address in GU17, GU47 and GU46 is within our area for window mastic, from the main roads to the quietest streets. Local streets include Bell Lane, Green Lane and Reading Road. Nearby, we also carry out window mastic in Blackwater (1 mile east), Hawley (1 mile south-east), College Town (1 mile north-east), Sandhurst (1 mile north-east) and York Town (2 miles east). Larger places within reach include Basingstoke (14 miles west), Farnborough (3 miles south-east), Fleet (5 miles south-west), Aldershot (6 miles south), Alton (15 miles south-west) and Tadley (15 miles west).
Landmarks near Frogmore
In Frogmore, that means homes and buildings near White Swan pub, Frogmore Community College and Sandhurst Memorial Park. The nearest railway station is Sandhurst station, about 0.8 miles north of the centre. A little further out are Staff College Museum (2.1 miles east) and Frimley Park Hospital (2.6 miles south-east). Open spaces near Frogmore include Horseshoe Lake and Wildmoor Heath.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Leave it or put it right?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Homes in smaller places like Frogmore can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start.
Why choose Mr Mastic in Frogmore
- Experience in homes, commercial sites and hotels
- White, clear, grey or coloured to suit, where the product allows
- A 12-month guarantee on all work
- Trusted Arbo and Everbuild sealants
Take a look at what affects the cost and our reviews.
Towns and villages near Frogmore
More services for Frogmore
When it isn’t the sealant
Sealant is not the answer to every problem, and we will tell you before any work starts. It won’t solve:
- Faulty window hardware
- Penetrating damp from a failed cavity tray or render
- Rotten timber, which needs a joiner first
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in Frogmore
- Aluminium frames
- Composite doors
- Window sills
- uPVC windows
- Patio & French doors
- Timber windows & doors
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes anything from an hour or two to a full day, depending on how many frames there are, depending on the amount of work. Parking around Frogmore 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.
- 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.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or email us and describe the job and send pictures if you have them.