Hertfordshire · England
Window & door mastic in Hitchin, Hertfordshire
Mastic around window and door frames, sills and patio doors for homes and businesses in Hitchin and across Hertfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Whistling draughts around closed windows
- Hard, cracked sealant around windows
- Gaps left after new windows were fitted
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
We also work for property managers and facilities teams in Hitchin and across Hertfordshire. Several sites can go on one quote.
How we handle window mastic in Hitchin
Over two decades of sealing frames has taught us which products suit which walls. We are ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. We work on timber windows & doors, uPVC windows and patio & French doors, and the jobs we see most are water coming in at the bottom corners of a door and gaps left after new windows were fitted.
In a town like Hitchin, the windows on the most exposed side of a house take the brunt of the rain, so the mastic there tends to fail first. Checking every frame, not just the obvious one, is time well spent.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or send us an email.
- Place
- Hitchin (SG4, SG5)
- Region
- Hertfordshire
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Check the mastic once a year
- Clean frames with a soft cloth and soapy water
- Avoid blasting the frames with a pressure washer
- Make sure the drainage slots aren’t blocked
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
When it is not the sealant
We won’t take on work that won’t last, so here’s what sealant cannot put right:
- Condensation trapped between the panes
- Draughts through the window seals rather than the frame
- Damp coming through the wall itself rather than the frame joint
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Window sills
- Composite doors
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Aluminium frames
How it works
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a morning for a couple of windows and a door. Parking in a town like Hitchin is usually straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Clear items away from the joints we are working on
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
How to get a quote
For a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
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Hitchin: your questions answered
Is there a guarantee on window mastic in Hitchin?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you cover Hitchin for window mastic?
Yes, Hitchin is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
How long before the joint can be used?
It depends on the product. We tell you how long to leave it before we go.
Can you reach windows above the ground floor?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Can you do the inside joint as well?
Yes. Indoors, we seal between the frame and the plaster or reveal.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
What we are called out for in Hitchin
Sun, frost and rain wear sealant out. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
Signs it’s time to call us include:
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
- Untidy mastic left by window fitters
- Black, perished sealant on frames
If you live in an older home near Church of the Holy Saviour, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before you book anyone
- Whether they seal over old material or remove it
- How much experience the applicator has
- How long to leave it before use
- What preparation is included
Leave it or put it right?
Resealing frames is a short job: the visit takes most of a day for a typical house, less for a few frames. Leave it until water is coming in and you may need plastering and decorating as well. Black mould and gaps in sealant don’t fix themselves, and in a busy home in Hitchin they get worse with every use. Replacing the sealant now is the simplest fix.
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
- Full insurance on every job
- Colour agreed with you before any work starts
- Colour picked to suit the job
- We leave the area clean and tidy
Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Hitchin homes and the weather
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Hitchin station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as Hitchin Girls' School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Hitchin is about 5 miles north-west of Stevenage, in Hertfordshire. Our applicators cover window mastic for homeowners, landlords and businesses in Hitchin, as part of our work across Hertfordshire. Hitchin is one of 381 towns and villages in Hertfordshire we cover for window mastic. We also work in London, around 32 miles away.
Postcode districts we cover here for window mastic: SG4 and SG5. If you need window mastic at a property on Market Place, London Road and Harrison Close or a nearby road, we can help. Hitchin sits on or near the A505 and A600. Other places close to Hitchin include Benslow (1 mile east), Poets Estate (1 mile east), Bearton (1 mile north-west), Walsworth (1 mile north-east) and Westmill (1 mile north-west). Further out, we also cover Stevenage (5 miles south-east), St Albans (14 miles south), Welwyn Garden City (11 miles south), Harpenden (10 miles south), Hatfield (13 miles south) and Hertford (13 miles south-east). Being one of Hertfordshire’s larger places, Hitchin has every kind of property, from flats to offices.
Landmarks near Hitchin
Typical jobs here are in homes near Highbury Infant School and Nursery, Butts Close and Kingshott School. Other local landmarks include Radcliffe Arms (under half a mile north-east) and St Mary's Church (within half a mile south-west). Hitchin has its own railway station: Hitchin station. A little further out are Wymondley Castle (1.7 miles east) and Lister Hospital (3.1 miles south-east). Not far away are Purwell Ninesprings and Markham's Hill.