Scottish Borders · Scotland
St Boswells New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for St Boswells, backed by a 12-month guarantee. Call for a quick quote.
- Sealant applied over dusty or wet surfaces
- Shower seals failing in the first year or two
- Worktop and upstand sealant coming away
What affects the quote in St Boswells
Your quote is based on your job. We look at:
- Working hours on commercial sites
- Any mould that needs treating
- Whether the work is at height
- Which sealant suits the joint
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
To help us quote quickly, please include:
- The type of property
- Where the property is
- How many joints, rooms or windows are involved
- How we’d reach the joints
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
About our new build mastic in St Boswells
Dust is the enemy of new-build sealant. We clean every joint thoroughly and prime where the surface and product need it, so the sealant actually sticks instead of bonding to the dust. We work on skirting & floors, plot handovers and windows & doors, and people most often call us about cracked sealant around new window and door frames and smeared, uneven beads picked up at snagging.
Timber frame is common in newer Scottish homes, and it settles over the first years, so skirting and floor joints can open up. Older stone-built homes, meanwhile, often have timber floors that move with the seasons.
All our work is covered by our one-year guarantee, wherever you are in the Scottish Borders.
- Place
- St Boswells (TD6)
- Region
- Scottish Borders
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
FAQs for St Boswells
Is there a guarantee on new build mastic in St Boswells?
All our work, in St Boswells and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Do you cover St Boswells for new build mastic?
Yes. Our work covers the whole of Scotland, and St Boswells is part of that. Just send an email to info@mrmastic.co.uk with a few details of the job.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Why has my new-build shower seal failed already?
It’s common, and there are generally two reasons: the house moving as it dries, and sealant that never bonded properly. A proper reseal deals with both.
Can you do plot mastic on a new development?
Yes. We take on second-fix sealant work across new plots. Good preparation keeps snagging to a minimum.
Should I wait before resealing?
If the seal has failed and water is getting in, do it now. Hairline cosmetic gaps can wait until the house has settled.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, the joint cleaned and primed where needed, and a new bead applied.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Leave it or put it right?
It often makes sense to do all the sealant items on a snagging list together. You get one visit and one clear quote to plan around. In an older home around St Boswells, damp from a failed joint can get into timber and plaster, which is a far bigger job than the sealant.
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first.
Why St Boswells customers choose us
- Neat joints and a tidy finish
- We never seal over old sealant
- ARBOMaster approved applicator
- Experience in homes, commercial sites and hotels
Read what affects the cost or what customers say.
Surface by surface
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Joints are prepared properly before sealing so the sealant lasts.
Windows and doors
On new builds, external frame sealant can be patchy. We reseal it with a weatherproof, flexible sealant.
New build mastic in St Boswells: local notes
Many new homes in Scotland are timber-framed, so skirting and sealant joints can open up as the building settles.
Whether the job is in St Boswells itself or nearby, the right material for each joint matters as much as a neat finish.
St Boswells is about 7 miles south-east of Galashiels, in the Scottish Borders. We provide new build mastic to homes and businesses in St Boswells and nearby. St Boswells is one of 89 towns and villages in the Scottish Borders we cover. Our Edinburgh page covers work nearby, about 34 miles away.
Jobs for new build mastic in TD6 works the same way as everywhere else we cover. That includes homes and businesses on Main Street, Southfield and Weirgate Avenue and the roads around them. You’ll find St Boswells on the A699, so it’s easy for us to get to. Neighbouring places we cover for new build mastic include Greycrook (1 mile south-east), Maxton (1 mile south-east), Newtown St Boswells (1 mile west), Bowden (3 miles west) and Newstead (3 miles north-west). Further out, we also cover Galashiels (7 miles north-west), Hawick (12 miles south-west), Kelso (8 miles east), Selkirk (8 miles west), Jedburgh (7 miles south-east) and Wilton (12 miles south-west).
What’s near St Boswells
Nearby you’ll also find Commendators House Museum (3.6 miles north-west) and Castle Holydean (3.7 miles west). Green spaces nearby include Eildon Hill North and Bemersyde Moss.
Towns and villages near St Boswells
More services for St Boswells
The process
The work is kept neat and contained to the joints we’re treating. The job normally takes anything from a few hours to several days, depending on the number of plots, and we tell you how long to leave it before we go. In smaller Scottish places, parking is generally less of an issue than access and distance. Tell us how to find the property and how to reach the work.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out.
- 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.
Getting ready for the visit
- Let us know about parking restrictions
- Mention any tricky access
- Tell us about any water getting in
Get a quote
Need a quote? Please drop us a line at info@mrmastic.co.uk with a few details. We will explain what we’d do and give you a clear price before we start.
Related advice
Common problems we fix in St Boswells
The first winter with the heating on dries a new home quickly. Gaps open along skirting, frames and worktops and cracks appear in the sealant.
Keep an eye out for these signs:
- Cracked sealant around new window and door frames
- Gaps behind new kitchen upstands
- Smeared, uneven beads picked up at snagging
- Gaps between new skirting and floors
In and around St Boswells, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Before booking anyone
- What preparation is included
- The length of the guarantee
- Is the old sealant removed completely?
- What happens if the job turns out different
When something else is needed
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Baths and trays that move too much for sealant to cope with
- Structural cracks in walls or ceilings
- Broken tiles or a split tray
If you are not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer.
Surfaces we seal
- Show homes
- Windows & doors
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Kitchens