Hertfordshire · England
New-build mastic & snagging in The Flints, Hertfordshire
New build mastic for The Flints, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Shower seals failing in the first year or two
- Internal frame sealant that has split
- Second-fix sealing on new plots
What happens on the day
A visit follows a simple pattern: we look at the joints together, protect the area around them, do the work and tidy away. Most jobs take anything from a few hours to several days, depending on the number of plots. Somewhere like The Flints needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we work through your snagging list or plot schedule with you.
- Failed or untidy sealant is cut out completely.
- Surfaces are cleaned of building dust and primed where needed.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
- Keep children and pets away from the work area
Ask for a quote
Want a quote for new build mastic? Please call 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
New build mastic in The Flints
Snagging sealant properly means taking the failed bead out completely. Fresh silicone can’t bond to the old layer, so the joint is cut out, cleaned, dried and resealed. We are often asked to deal with joints pulling apart as timber shrinks and new-build shower sealant that has already split, on plot handovers, skirting & floors and windows & doors.
For a small place like The Flints, the journey and access are planned in advance, and the work itself is the same as on any site.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- The Flints (SG5)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work cannot fix
We’ll always be straight with you, so here’s what sealant cannot fix:
- Plumbing faults behind the sealant
- A tray or bath that isn’t properly supported, until it’s fixed
- Your warranty claim itself, which is between you and the builder
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Bathrooms & en suites
- Plot handovers
- Show homes
- Windows & doors
- Kitchens
- Skirting & floors
Why deal with it now?
DIY kits do not solve the main problems with new-build sealant: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. In a small place like The Flints, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Doing several joints on one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Why book with us
- A choice of colours where the product allows
- An ARBOMaster approved applicator
- Neat joints and a tidy finish
- 4.9 on Google from 180+ five-star reviews
See what affects the cost and customer reviews.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Avoid running a DIY bead over the old one
- Record problems with dated photos
- Wipe joints with warm soapy water
- Ventilate bathrooms well, especially in the first year
Follow the cure time we give you before the area gets wet. Silicone is usually left for about a day before water reaches them.
Report failed sealant to the builder while you are in the snagging period. After that, putting it right may fall to you.
Places near The Flints
Other services in The Flints
New homes and floors in The Flints
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For new homes near Luton station, it’s worth checking the sealant early, while snags are still fresh. Around The Flints, as everywhere, new build mastic is only as good as the preparation behind it.
The Flints is about 4 miles south-west of Hitchin, in Hertfordshire. Every kind of property in The Flints can book us for new build mastic. The work is guaranteed for a year. Across Hertfordshire, we cover 381 places, and The Flints is one of them. We also work in London, about 32 miles from The Flints.
All of SG5 is covered for new build mastic, from the main roads to the quietest streets. Close by, we work in Great Offley (1 mile east), Temple End (2 miles east) and Ley Green (2 miles south-east). Larger places within reach include Hemel Hempstead (13 miles south), Stevenage (7 miles east), St Albans (12 miles south), Welwyn Garden City (11 miles south-east), Harpenden (8 miles south) and Hitchin (4 miles north-east).
Near you in The Flints
In The Flints, that means homes and buildings near The Bull Public House, among other places. The Flints’s nearest station is Luton station, roughly 4.1 miles south-west of the centre. Other landmarks nearby include Ravensburgh Castle (2.7 miles north-west) and John Dony Field Centre (2.9 miles south-west). Open spaces near The Flints include Markham's Hill and Pegsdon Hills.
Surface by surface
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. We reseal it with a weatherproof, flexible sealant.
Show homes
We seal show-home bathrooms, kitchens and frames. We’ll plan around viewing times.
What affects the cost of new build mastic
Every job gets its own quote. These are the things that affect it:
- The size of the job
- Which sealant suits the joint
- Whether the work is at height
- Mould in or behind the old joints
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
Before you ask for a quote, have a think about:
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
- Photos by email, if that is easy
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or send us an email.
Common questions in The Flints
Will you come out to The Flints?
Yes. The Flints is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do new build mastic in The Flints?
Yes, The Flints is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear price.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you do plot mastic on a new development?
Yes. We take on second-fix sealant work across new plots. We clean and prime joints properly to keep callbacks down.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
When is the best time to reseal in a new build?
If the seal has failed and water is getting in, do it now. Hairline cosmetic gaps can wait until the house has settled.
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.