Hertfordshire · England
Newgate Street Window Mastic
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Newgate Street. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic that is falling out in pieces
- Draughty joints inside around the window
- Untidy mastic left by window fitters
Why it’s worth doing now in Newgate Street
Resealing frames is a short job: the visit takes a morning for a couple of windows and a door. Wait for damp to appear and there may be plaster and decorating to sort out too. In a small place like Newgate Street, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email and we’ll talk you through it.
Why book with us
- ARBOMaster approved applicator
- 180+ five-star Google reviews
- A choice of colours where the product allows
- More than 20 years in sealant work
Take a look at our cost guide and our reviews.
Window mastic for homes and businesses in Newgate Street
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. We work on composite doors, patio & French doors and timber windows & doors, and the jobs we see most are sealant in the wrong colour for the frame and rain getting in at the frame or under the sill.
Around Newgate Street, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Newgate Street (SG13)
- Region
- Hertfordshire
- Cover
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Also in Newgate Street
What we do, step by step
At the end, we look at the finished work together. The visit itself usually takes a few hours for a handful of frames, longer for a whole house, depending on how much there is to do. For a village or hamlet like Newgate Street, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
- Mention any leaks or damp you’ve noticed
Getting a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or send us an email.
Related advice
Newgate Street homes and the weather
Historic houses like Wyllyotts Manor (about 4 miles south-west) are a reminder that the area around Newgate Street has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
For site and facilities teams at buildings such as Ponsbourne St Mary's Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Cuffley station, renewing tired window mastic between tenants heads off draught and damp complaints.
Newgate Street is about 3 miles north-west of Cheshunt, in Hertfordshire. Newgate Street gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Newgate Street is one of 381 towns and villages in Hertfordshire we cover. For nearby work, see our London page.
Work in SG13 works the same way as everywhere else we cover. Local streets include Newgate Street Village, Carbone Hill and The Ridings. Other places close to Newgate Street include Cuffley (1 mile south), Little Berkhamsted (2 miles north), Northaw (2 miles south-west), Bayford (2 miles north) and Essendon (3 miles north-west). We also work in nearby towns such as Watford (13 miles west), Hemel Hempstead (15 miles west), Stevenage (13 miles north), St Albans (9 miles west), Bishop's Stortford (15 miles north-east) and Welwyn Garden City (6 miles north-west).
Landmarks near Newgate Street
Typical jobs here are in homes near The Coach And Horses Public House, among other places. For rail, the closest station is Cuffley station, about 1.4 miles south. A little further out are Chase Farm Hospital (4.3 miles south) and Hertford Castle (4.9 miles north). Green spaces nearby include Fir and Pond Woods and Cheshunt Lake.
Questions from Newgate Street
Do you cover smaller places like Newgate Street?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do window mastic in Newgate Street?
Yes. Our work covers London and the South East, and Newgate Street is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
Do you have sealant for grey or black windows?
Yes, we choose a colour to suit the frame. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do, and we’re fully insured.
Where are you based?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Do you work on first-floor windows?
Normally, yes. Access is planned before we start.
What affects the quote in Newgate Street
You’ll get a clear quote before we start. It takes into account:
- How easy the joints are to reach
- The old material and how stubborn it is
- The number of rooms or windows
- Whether there’s mould to deal with
What you pay reflects the work, not a rough estimate. That is why we ask about the job first and give you a clear quote before we start.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- Roughly how big the job is
- Whether it’s a home or a business
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
What we can’t put right
Before booking, it’s worth knowing the limits:
- Worn gaskets, brush seals or a door that has dropped
- Soft or decayed wood in the frame
- A sash or casement that won’t close properly
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Where we work in Newgate Street
- Patio & French doors
- Timber windows & doors
- Composite doors
- Aluminium frames
- Window sills
- uPVC windows
Different surfaces, different methods
Aluminium frames
Aluminium moves with heat, and the frames are often slimmer than uPVC. A tidy bead in anthracite grey, black or a matching colour suits the frame.
Composite doors
An exposed front door gets wind-driven rain. Those corners get the most care.
Common problems we fix in Newgate Street
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. A sealant that cannot keep up eventually tears.
Signs it’s time to call us include:
- Gaps left after new windows were fitted
- Gaps between the frame and the inside reveal
- Sealant in the wrong colour for the frame
- Mastic that has split away from the wall
In the older streets around Church of St Mary Ponsbourne, the joint between an old wall and a newer frame is normally the first place rain gets in.
Before you book anyone
- Whether VAT is included
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
- What guarantee comes with the work
How to look after the new joints
To keep the joints looking good and working properly:
- Clear any debris from frame drain holes
- Walk round the house once a year and look at the joints
- Wipe condensation off the frames
- Use gentle cleaners on frames and sealant
Check the drainage slots in the frames aren’t blocked, so rain drains out rather than building up at the sealant.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.