Essex · England
Window Mastic in Harrowcross
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Harrowcross. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps between the frame and the inside reveal
- Old mastic that has gone black or come away
- Mastic that has split away from the wall
What we cannot put right
We will not take on work that won’t last, so here’s what sealant can’t put right:
- Damp problems in the wall away from the window
- Faulty window hardware
- Misting between the panes of a double-glazed unit (that needs a new unit)
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
What we seal
- Window sills
- uPVC windows
- Patio & French doors
- Aluminium frames
- Timber windows & doors
- Composite doors
Window mastic for homes and businesses in Harrowcross
The new joint does not have to be white. White, brown, anthracite grey, black and clear sealants are all available, so the line suits the frame instead of standing out. Typical jobs include hard, cracked sealant around windows and gaps left after new windows were fitted, across patio & French doors, uPVC windows and aluminium frames.
Mastic can only go onto a dry, clean joint, so window work in Harrowcross is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Each job carries a 12-month guarantee.
- Place
- Harrowcross (CO9)
- Region
- Essex
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What window mastic looks like in Harrowcross
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. Historic houses like Hedingham Castle (about 1.7 miles north-east) are a reminder that the area around Harrowcross has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Hedingham School and Sixth Form, the mastic around its windows and doors needs looking after like any other building’s.
Harrowcross is about 3 miles north-west of Halstead, in Essex. If you need window mastic in Harrowcross, please call 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Essex, Harrowcross included. Harrowcross is one of 644 towns and villages in Essex where we work. You can also see our page for Chelmsford, about 17 miles away.
Work in CO9 works the same way as everywhere else we cover. Nearby, we also carry out window mastic in Sible Hedingham (1 mile north-east), Almshouse Green (1 mile west), Castle Hedingham (2 miles north-east), Gosfield (3 miles south) and Beazley End (4 miles south-west). Larger places within reach include Colchester (15 miles east), Braintree (6 miles south), Witham (12 miles south), Saffron Walden (15 miles west), Camulodunum (14 miles south-east) and Halstead (3 miles south-east).
Near you in Harrowcross
We work in homes and buildings around The White Lion pub. Other landmarks nearby include Hedingham Castle (1.7 miles north-east) and Halstead Hospital (3 miles south-east). Not far away are Belcher's and Broadfield Woods.
How it works
We keep the work tidy and contained to the area we are working on, so you can get on with your day. The job generally takes a few hours for a few frames, or a day or more for a whole house, and we tell you how long to leave it before we go. In a small place like Harrowcross, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Mention any parking rules near the property
- Keep children and pets away from the work area
Ask for a quote
We do not publish a price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
Read more
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
How we quote for window mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Any mould that needs treating
- When we can work, for business premises
- The product the joint needs
- How much old sealant there is and how hard it is to remove
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- What’s wrong with the joints now
- Roughly how big the job is
- Where the job is, and your postcode
- Any access issues, like height or stairs
Asking for a quote is easy: let us know the job and the location and its rough size. A few photos by email make the job easier to understand.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Why it’s worth doing now in Harrowcross
Resealing frames is a short job: it 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. Older cottages and farmhouses around Harrowcross can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will explain what it covers.
Why Harrowcross customers choose us
- 20+ years of sealant experience
- Tidy, careful work
- Rated 4.9 stars on Google
- Experience in homes, commercial sites and hotels
See how sealant jobs are priced and our reviews.
Common questions in Harrowcross
What guarantee comes with window mastic in Harrowcross?
All our work, in Harrowcross and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Will you come out to Harrowcross?
Yes, Harrowcross is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you work for letting agents?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels across Essex.
When is the sealant fully cured?
Cure times vary by product and the conditions. Before we leave, we will tell you the cure time.
Is there any odour?
There can be a smell while the sealant cures. Ventilation helps.
Do you seal inside as well as outside?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Nearby places to Harrowcross
More services for Harrowcross
Signs you need window mastic in Harrowcross
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
Any of these means the joints need attention:
- Gaps between the frame and the inside reveal
- Untidy mastic left by window fitters
- A bead that doesn’t match the frame
- Damp patches on the reveal after heavy rain
In the older streets around Church of St Peter, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- How the colour is chosen
- Whether they’re fully insured
- The length of the guarantee
- How the joint is cleaned and prepared