Mr Mastic · South East, London and Scotland
Sealant contractors for construction
Mastic and sealant packages for builders, developers and main contractors: new-build mastic, snagging, movement and expansion joints, windows, fire-rated and external joints.
- New-build mastic and snagging
- Movement and expansion joints
- Windows, doors and facades
What we do on site
- New-build mastic: kitchens, bathrooms, skirtings and trims before handover
- Snagging sealant before and after handover
- External and expansion joints in brickwork, cladding and concrete
- Window and door perimeters, inside and out
- Fire-rated sealant where specified
- Floor joints and skirtings
- Glazing and curtain-wall joints
Why it fails on site
On new builds, sealant often goes onto dusty, damp or unprimed surfaces in a hurry at the end of the programme, and fails within a year or two. We saw this at a new build in Forge Wood, Crawley, where the shower tray seal failed after 16 months because it was laid onto a gritty, unprimed surface. Proper preparation, the right backing and the right product for each joint is what avoids call-backs.
Working with your programme
Tell us the site, the scope, the specification and the programme. We’ll confirm the products, give you one clear quote and fit in with your sequence and site rules. Tell us what paperwork you need, such as method statements and risk assessments, and we’ll confirm what we can supply.
Paperwork and insurance
We’re fully insured for domestic, commercial and hospitality work. Tell us what your site needs, such as method statements, risk assessments or insurance details, and we’ll confirm what we can supply with the quote. Every job comes with our one-year guarantee, and we’re ARBOMaster approved applicators using Arbo and Everbuild products.
Quotes
We don’t publish set prices for commercial work, because every site is different. Tell us the site, what needs doing, roughly how much and your working hours, with photos or drawings if you have them. We’ll arrange a site visit where it’s needed and give you one clear quote before any work starts.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“Called for a bathroom reseal and the mastic man showed up on time with all the right equipment. Brilliant attention to detail. The sealant looks perfect and they kept everything tidy.”
“We had old mastic that needed replacing throughout our kitchen and bathrooms. The mastic man professional was knowledgeable, quoted fairly, and delivered excellent quality work. Highly recommend!”
“Professional mastic man service from start to finish. They assessed the work properly, gave a clear quote, and executed the job perfectly. Very satisfied with the results.”
Sealant contractors for construction: common questions
Do you work to a specification?
Yes. Send us the specification and we’ll confirm the products with the quote.
Do you do snagging?
Yes. We take on new-build sealant snagging before and after handover.
Do you seal expansion joints?
Yes, in brickwork, cladding and concrete, with the right backing and a flexible sealant suited to the movement.
Is commercial work guaranteed?
Yes. Every job comes with our one-year guarantee.

