Hertfordshire · England
Sand mastic for sash & case windows in Todd's Green, Hertfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Todd's Green. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Modern sealant on a period surround
- Patchy fillers round a sash window
- Window mastic to renew ahead of painting
Sand mastic in Todd's Green
Fresh sand mastic forms a skin quite soon, but it takes longer to harden fully. Traditional guidance is not to paint over it and we’ll advise if you are redecorating. We work on tenement windows, timber door frames and period & listed homes, and common reasons people get in touch are silicone on a period window that looks wrong and failed mastic on an exposed elevation.
In a village or hamlet like Todd's Green, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Todd's Green (SG1)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Find out about consent before window work on a listed home
- Leave the new mastic unpainted
- Have rotten timber repaired before new mastic goes in
- Avoid patching sand mastic with silicone
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
Towns and villages near Todd's Green
More services for Todd's Green
DIY versus a professional finish
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.
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 does not work out, we can still put it right.
Todd's Green: your questions answered
I let a flat near Stevenage station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is Todd's Green within the area you cover?
Yes. Todd's Green is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Todd's Green.
Can you quote for more than one area?
Yes. Just list everything you need.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick normally suit sand mastic and newer frames usually get a flexible sealant.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
How the job changes by surface
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Landlords, agents and businesses in Todd's Green
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Sand mastic in Todd's Green: local notes
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. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
Schools such as The John Henry Newman School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as 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. Rented homes near Stevenage station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Todd's Green is about 2 miles north-west of Stevenage, in Hertfordshire. If you need sand mastic in Todd's Green, please phone 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Hertfordshire, Todd's Green included. Todd's Green is one of 381 towns and villages in Hertfordshire we cover. For nearby work, see our London page (30 miles or so).
All of SG1 is covered for sand mastic, from the main roads to the quietest streets. 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). Further out, we also cover 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).
Near you in Todd's Green
Locally, jobs take us to homes and businesses close to Hermit of Redcoats pub and Graveley Primary School, among other places. The closest station to Todd's Green is Stevenage station, roughly 1.7 miles south-east. Other landmarks nearby include Lister Hospital (0.6 miles east) and Stevenage Museum (1.9 miles south-east). Green spaces nearby include Purwell Ninesprings.
What happens on the day
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from a few hours to a full day, depending on how many windows. In a small place like Todd's Green, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
Get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work.
Read more
When it is not the sealant
A few problems are outside what sealant work can do:
- Planning or listed building consent (your local planning authority decides)
- Crumbling stone or brickwork round the window
- Sashes that need overhauling
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer before booking.
Where we work in Todd's Green
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Sash and case windows
- Timber door frames
Why act early in Todd's Green
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. In a small place like Todd's Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why book with us
- Trusted Arbo and Everbuild sealants
- Tidy, careful work
- An ARBOMaster approved applicator
- More than 20 years in sealant work
Read what affects the cost or customer reviews.