Hertfordshire · England
New-build mastic & snagging in Stevenage, Hertfordshire
New-build sealant joints in Stevenage need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Joints pulling apart as timber shrinks
- Kitchen sealant that has pulled off the wall
- Plot mastic for developers ahead of handover
What the job involves on each surface
Bathrooms and en suites
New-build bathrooms and en suites are where sealant fails most often. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
Kitchens
Sink joints are wet all the time. A kitchen sealant goes in there, food-safe where it’s needed.
New build mastic in Stevenage, done properly
We work in new homes and on new-build sites across Stevenage. Whether it’s one en suite or a run of plots, the method is the same: remove, clean, prime where needed, then a neat new bead. We work on plot handovers, show homes and windows & doors, and common reasons people get in touch are cracks appearing as a new home settles and sealant applied over dusty or wet surfaces.
Stevenage is big enough to have new developments going up alongside its older streets. New homes need their plot mastic and sealant finished well, and owners often find snags in the first year or two, as a new house dries out and settles.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Place
- Stevenage (SG1, SG2, SG3)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours for most snagging lists, longer for a run of plots. Jobs in a place the size of Stevenage range from town-centre flats to offices and family homes. For each, it helps to know about access, parking and where the joints are.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Mention any tricky access
- Let us know about earlier repairs to the joints
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, call 0345 464 0079 or email us.
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Landlords, agents and businesses in Stevenage
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Letting agents and landlords in Stevenage can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
New homes and floors in Stevenage
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Stevenage was built as one of England’s post-war new towns. Newer neighbourhoods have been added to Stevenage over the years. Newer homes need snagging; older ones need their joints renewing.
In and around Stevenage, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint. If you’ve bought a new home near Stevenage station, the sealant around baths, showers and frames is worth checking in the first year or two.
Stevenage is about 26 miles east of Milton Keynes, in Hertfordshire. If you need new build mastic in Stevenage, please call 0345 464 0079 or drop us an email for a quick quote. We cover Hertfordshire from our Crawley base. Our Hertfordshire coverage runs to 381 places, and Stevenage is one of them. For nearby work, see our London page.
Work in SG1, SG2 and SG3 works the same way as everywhere else we cover. You will find streets such as King Pin Square, Market Square and Market Place, all of which we cover. You will find Stevenage on the A602 and B197, so it’s easy for us to get to with everything needed for new build mastic. Close by, we work in Bedwell (1 mile south-west), Pin Green (1 mile north-west), Chells (1 mile east), St Nicholas (1 mile north) and Rooks Nest (1 mile north). Further out, we also cover St Albans (13 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (8 miles south), Harpenden (10 miles south-west), Hitchin (5 miles north-west) and Hoddesdon (13 miles south-east). As one of the bigger places in Hertfordshire, Stevenage has every kind of property, from flats to offices.
Landmarks near Stevenage
Typical jobs here are in homes near The Heathcote School, Church of Saint Nicholas and Marriotts School, among other places. The nearest railway station is Stevenage station, about 1.2 miles south-west. Nearby you’ll also find Benington Castle (2.9 miles east) and Stevenage Museum (0.8 miles south-west). Not far away are Pryor's Wood.
Quotes for new build mastic in Stevenage
There’s no set price list. The quote depends on:
- How much there is to do
- Mould in or behind the old joints
- The number of rooms or windows
- Whether the work is at height
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Asking for a quote
To help us quote quickly, please include:
- Photos by email, if that is easy
- The type of property
- The problem you’ve noticed
- How many joints, rooms or windows are involved
Getting a quote is simple: let us know the job and the location. A few photos by email make the job easier to understand, and we will take it from there.
Common questions in Stevenage
Do you work for landlords with property near Stevenage station?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
What guarantee comes with new build mastic in Stevenage?
All our work, in Stevenage and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Do you cover Stevenage?
Yes. We are based in Crawley and work across South East England, London and Scotland.
Can you work from my snagging list?
Yes. Photos of each sealant item help us quote. If something isn’t sealant, we will say so.
Are you insured?
Yes, we’re fully insured for domestic and commercial work.
Should I go to my builder first?
Your builder, if you’re still in their snagging or warranty period. After that, or if their repair keeps failing, we can do it.
Is it worth trying it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
When something else is needed
We will not take on work that will not last, so here’s what sealant can’t put right:
- Plumbing faults behind the sealant
- Damaged fittings that need replacing
- Baths and trays that move too much for sealant to cope with
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Stevenage
- Windows & doors
- Plot handovers
- Skirting & floors
- Kitchens
- Bathrooms & en suites
- Show homes
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Wipe joints with warm soapy water
- Get a leaking seal dealt with straight away
- Watch for new gaps as the house dries out
- Don’t seal over failed sealant yourself
Clean the sealant with a mild detergent and a soft cloth. Avoid abrasive pads and strong solvents as they wear the bead.
If a shower tray or bath seal splits in the first year, look for movement. Have it resealed, and the tray or bath checked, before it gets worse.