Hertfordshire · England
Window & door mastic in Charlton, Hertfordshire
Mastic around window and door frames, sills and patio doors for Charlton, backed by a 12-month guarantee. Call for a quick quote.
- Hard, cracked sealant around windows
- Whistling draughts around closed windows
- Mastic that is falling out in pieces
Window mastic in Charlton
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on window sills, patio & French doors and composite doors, and the jobs we see most are water coming in at the bottom corners of a door and a bead that doesn’t match the frame.
Mastic can only go onto a dry, clean joint, so window work in Charlton is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Place
- Charlton (SG5)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. They’re cut out and resealed with exterior sealant.
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 look for the cause first.
Window mastic in Charlton: local notes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you let a flat or house near Hitchin station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. In the older streets around St Mary's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Charlton is about 1 mile south-west of Hitchin, in Hertfordshire. Homes, rented property, offices and hotels in Charlton is covered for window mastic, old or new, large or small. The work is guaranteed for a year. We cover 381 towns and villages across Hertfordshire. Our London page covers work nearby (31 miles or so).
Postcode districts we cover here for window mastic: SG5. Neighbouring places we cover for window mastic include Gosmore (1 mile south-east), Hitchin (1 mile north-east), Benslow (1 mile north-east), Bearton (1 mile north) and Westmill (1 mile north). Further out, we also cover Hemel Hempstead (15 miles south-west), Stevenage (5 miles south-east), St Albans (13 miles south), Welwyn Garden City (11 miles south), Harpenden (9 miles south) and Hatfield (12 miles south).
Landmarks near Charlton
Typical jobs here are in homes near Hitchin Boys' School, The Three Moorhens Public House and Kingshott School and the streets around them. For rail, the closest station is Hitchin station, about 1.4 miles north-east of the centre. Nearby you will also find North Hertfordshire Museum (0.8 miles north-east) and Lister Hospital (3.3 miles east). Open spaces near Charlton include Markham's Hill and Oughtonhead Nature Reserve.
Why it’s worth doing now in Charlton
Resealing frames is a short job: the visit takes a few hours for a handful of frames, longer for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. Around Charlton, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or send us an email and we’ll talk you through it.
Why choose Mr Mastic in Charlton
- Arbo and Everbuild products
- Any old sealant cut out fully, not covered over
- Full insurance on every job
- Sanitary silicone with an anti-fungal additive in wet areas
See our cost guide or our reviews.
When to call us in Charlton
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
These are the problems we’re asked about most:
- White mastic on grey or black frames
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
- Damp patches on the reveal after heavy rain
For site and facilities teams at buildings such as Highbury Infant School and Nursery, the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- What the cure time is
- Which sealant they’ll use, and why
- How the joint is cleaned and prepared
- Are they insured?
FAQs for Charlton
Do you cover smaller places like Charlton?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Hitchin station?
Yes, rental work is part of what we do. You can phone 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.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and you will get one quote.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.
Do you guarantee window mastic?
Yes. All our work carries a 12-month guarantee, and we’re ARBOMaster approved applicators.
Can you reach windows above the ground floor?
Yes, where it’s safe. Higher or awkward frames may need extra access, and we’ll confirm what’s needed.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme.
Will resealing my frames help with draughts?
Often, yes. Air often gets in between the frame and the wall, and sealing the inside and outside joints closes that path.
When it isn’t the sealant
We will not take on work that won’t last, so here’s what sealant can’t put right:
- Rotten timber, which needs a joiner first
- Condensation trapped between the panes
- Worn gaskets, brush seals or a door that has dropped
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
What we seal
- Timber windows & doors
- Window sills
- Patio & French doors
- Composite doors
- uPVC windows
- Aluminium frames
Other services in Charlton
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Keep paint off silicone joints
- Air rooms to keep condensation down around windows
- Wash the frames with mild soapy water
- Avoid blasting the frames with a pressure washer
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
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.
Landlord and commercial work in Charlton
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Landlords and letting agents in Charlton can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
What happens on the day
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before any work begins. Most jobs take a morning for a couple of windows and a door. In a small place like Charlton, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
- Clear items away from the joints we’re working on
Get a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear quote before we start.