Hertfordshire · England
Window Mastic in Colney Street
Our applicators work in Colney Street on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Whistling draughts around closed windows
- White mastic on grey or black frames
- Mastic that’s falling out in pieces
How we quote for window mastic
You’ll get a clear quote before work begins. It’s based on:
- Any working-time requirements on site
- The product the joint needs
- Any mould that needs treating
- The amount of work
Doing several joints on one visit is generally more efficient than separate visits. You will get one clear quote for the whole job.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Any access issues, like height or stairs
- Photos by email, if that’s easy
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
Window mastic in Colney Street
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. We’re often asked to deal with leaking joints at the ends of sills and gaps between the frame and the inside reveal, on timber windows & doors, patio & French doors and composite doors.
In a village or hamlet like Colney Street, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
Whatever the size of the job, you get the same one-year guarantee.
- Place
- Colney Street (AL2, WD7)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in Colney Street
Some failures date back to when the windows were fitted. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, so it comes away long before its time.
Common reasons people contact us are:
- Leaking joints at the ends of sills
- Cold air getting in at the frame edge
- Cracked internal joints between frame and plaster
- Rain getting in at the frame or under the sill
Schools such as Park Street Church of England Voluntary Aided Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before booking
- What product goes in the joint
- Are they insured?
- How the colour is chosen
- Who turns up on the day
What the job involves on each surface
uPVC windows
The frame is cleaned with a product that will not harm the plastic, then the new bead is laid against the frame and the wall.
Patio & French doors
Water at the foot of a door frame isn’t always the mastic: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
Common questions in Colney Street
Do you work for landlords with property near How Wood station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Is Colney Street within the area you cover?
Yes. Colney Street is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Is the new sealant paintable?
Not normally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Can you do upstairs windows?
Yes, where it’s safe. For high or awkward windows, we’ll tell you what access is needed.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Why deal with it now?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. Around Colney Street, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Why Colney Street customers choose us
- Trusted Arbo and Everbuild sealants
- ARBOMaster approved applicator
- Old sealant always removed completely
- 20+ years of sealant experience
Take a look at what affects the cost or our reviews.
What sealant work cannot fix
In fairness, there are a few things sealant won’t fix:
- Broken hinges, locks or handles
- A frame that has rotted at the joint
- A failed sealed unit that has misted up
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in Colney Street
- Window sills
- uPVC windows
- Aluminium frames
- Composite doors
- Timber windows & doors
- Patio & French doors
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Repaint timber before it’s bare
- Avoid blasting the frames with a pressure washer
- Keep paint off silicone joints
- Keep solvents and bleach off the sealant
Wipe the frames with soapy water when you clean the windows, and avoid solvent cleaners on the sealant.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.
How it works
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes anything from an hour or two to a full day, depending on how many frames there are. Somewhere as small as Colney Street, access is often the only tricky part. 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.
- We remove the old mastic and clean the frame edge and wall.
- 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
- Mention any tricky access
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
Getting a quote
We quote each job on its own, so start by telling us what you need. Just ring 0345 464 0079 or email us with the details.
Advice
Colney Street homes and the weather
Historic houses like High Elms Manor (about 2.9 miles west) are a reminder that the area around Colney Street has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
Homes close to Church of the Holy Trinity include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near How Wood station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Colney Street is about 3 miles south of St Albans, in Hertfordshire. From the centre of Colney Street to the outskirts, we cover window mastic for every kind of property. Across Hertfordshire, we cover 381 places, and Colney Street is one of them. For nearby work, see our London page (18 miles or so).
We work across AL2 and WD7 for window mastic and the streets around it. Whether your property is on Old Parkbury Lane, Ventura Park and Radlett Road or anywhere close by, our applicators can take on the job. We also cover the places around Colney Street: Frogmore (1 mile north-west), Park Street (1 mile north-west), How Wood (1 mile north-west), Bricket Wood (2 miles west) and Chiswell Green (2 miles north-west). Larger places within reach include Watford (4 miles south-west), Hemel Hempstead (6 miles north-west), Stevenage (15 miles north-east), St Albans (3 miles north), Welwyn Garden City (8 miles north-east) and Harpenden (8 miles north).
Landmarks near Colney Street
In Colney Street, that means homes and buildings near The George and Dragon Public House and Samuel Ryder Academy, among other places. The closest station to Colney Street is How Wood station, about 1 mile north-west. Nearby you’ll also find Kingsley Green (1 mile east) and The Maltings (2.9 miles north). Not far away are Verulamium Lake and Broad Colney Lakes.