Hertfordshire · England
Window Mastic in Todd's Green
Mastic around window and door frames, sills and patio doors in Todd's Green, with a 12-month guarantee on every job. Ask us for a quote.
- Sealant in the wrong colour for the frame
- Cracked or shrunken mastic around the frame
- Cold air getting in at the frame edge
About our window mastic in Todd's Green
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on aluminium frames, timber windows & doors and window sills, and common reasons people get in touch are white mastic on grey or black frames and leaking joints at the ends of sills.
Around Todd's Green, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Whatever the size of the job, you get the same 12-month guarantee.
- Place
- Todd's Green (SG1)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. 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 Todd's Green, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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
- For business premises, tell us about site rules or sign-in
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
To get a quote, phone 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 we start.
Related advice
Quotes for window mastic in Todd's Green
We quote each job individually. This is what makes a difference:
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- Which sealant suits the joint
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work and give you a clear price.
Towns and villages near Todd's Green
Other services in Todd's Green
Questions from Todd's Green
Do you cover Todd's Green for window mastic?
Yes. Our work covers London and the South East, and Todd's Green is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Will you come out to Todd's Green?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
How many windows can you do in a day?
Allow a few hours for a handful of frames, longer for a whole house. Access and how stubborn the old mastic is affect the time most.
Can you reach windows above the ground floor?
Yes, where they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
What information do you need?
A short description and the location, plus pictures if you have them. We’ll ask anything else we need to know.
Leave it or put it right?
Not every sealant suits a window. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. Around Todd's Green, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts.
Why Todd's Green customers choose us
- White, clear, grey or another colour, product permitting
- We agree the colour with you first
- Experience in homes, commercial sites and hotels
- More than 20 years in sealant work
See what affects the cost or our reviews.
What the job involves on each surface
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match suits the frame.
Honest limits
It helps to know what we can’t do too:
- A failed sealed unit that has misted up
- A frame that has rotted at the joint
- Damp coming through the wall itself rather than the frame joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Timber windows & doors
- Patio & French doors
- Window sills
- uPVC windows
- Composite doors
- Aluminium frames
Aftercare tips
To keep the joints looking good and working properly:
- Don’t aim a pressure washer at the joints
- Don’t use solvent cleaners on the joint
- Check the mastic once a year
- Keep paint off silicone joints
Try not to touch the new joint while it cures, following the cure time we give you. Do not point a pressure washer at the joints.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Do you need window mastic in Todd's Green?
Sun, frost and rain wear sealant out. UV light hardens the outside of the bead, until it loses its stretch and starts to crack.
If you can see any of these, it’s time to have the joints looked at:
- Cracked sealant at the sill ends
- Gaps between the frame and the inside reveal
- Water coming in at the bottom corners of a door
- Old mastic that has gone black or come away
For landlords with property near Stevenage station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Before you book anyone
- What happens if they find a problem under the old sealant
- How much experience the applicator has
- What insurance they hold
- How long to leave it before use
What window mastic looks like in Todd's Green
With historic houses such as Knebworth House (about 3.5 miles south) nearby, there’s older building stock in the area around Todd's Green as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Church of St Mary the Virgin, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Schools such as The John Henry Newman School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Todd's Green is about 2 miles north-west of Stevenage, in Hertfordshire. If you need window mastic in Todd's Green, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Hertfordshire from our Crawley base. 381 places in Hertfordshire are on our list, from the larger towns to small villages. You can also see our page for London, about 30 miles away.
Here we cover the SG1 postcode area for window mastic. We also cover the places around Todd's Green: Lower Titmore Green (1 mile west), Titmore Green (1 mile west), Little Wymondley (1 mile north-west), Graveley (1 mile north-east) and Great Wymondley (1 mile north). We also work in nearby towns such as Hemel Hempstead (15 miles south-west), St Albans (13 miles south), Welwyn Garden City (9 miles south), Harpenden (9 miles south-west), Hitchin (3 miles north-west) and Hoddesdon (15 miles south-east).
What’s near Todd's Green
We work in homes and buildings around Hermit of Redcoats pub and Graveley Primary School, among other places. The nearest railway station is Stevenage station, about 1.7 miles south-east of the centre. Other landmarks nearby include Lister Hospital (0.6 miles east) and Stevenage Museum (1.9 miles south-east). Green spaces nearby include Purwell Ninesprings.