Mastic contractors in Borehamwood
Work needed on a mastic package in Borehamwood? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Oversized or tapered gaps around new frames
- Failed sealant in an existing building being refurbished
- Cracks opening in caulked internal joints
Construction mastic near Borehamwood
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
About our construction mastic in Borehamwood
Site managers want applicators who turn up with the right cards and paperwork. We’re a Constructionline member and CHAS accredited, and every applicator holds a CSCS card, and we’re fully insured. RAMS, an insurance certificate and CSCS details can be confirmed with the quote if you tell us what you need. We work on cladding and panel joints, floor and skirting junctions and sanitary and kitchen joints, and what we are called in for most is a mastic package split between trades with no clear owner and early adhesion failures on new external joints. Searching for sealant specialists in Borehamwood? We have been sealing commercial buildings since 2005.
Older town-centre buildings in places like Borehamwood are often converted to new uses or extended, which puts new frames and panels against old brick, stone or render. Getting the product and primer right for both faces is what keeps those joints sound.
We stand behind the joints we seal: 12 months, guaranteed. That covers our preparation and application, and if something we did falls short, we return to it.
- Place
- Borehamwood (WD6)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on every job
- Quote
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Work for main contractors and building owners
Hotels, schools, healthcare sites, offices and retail units book us directly too. We plan around the way the building is used, so guests, pupils, patients or staff are disturbed as little as possible.
As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
Construction mastic around Borehamwood: how the place shapes the job
Borehamwood lies roughly 14 miles out from central London. Construction around the commuter belt mixes station-side flats with refurbished offices and units, and main contractors there need mastic that keeps to the programme. The area within 2 miles of Borehamwood holds a number of hotels. When hotels extend or refit, the work is typically squeezed between peak periods, mastic included.
On a healthcare site such as Royal National Orthopaedic Hospital, 2.5 miles south-west of Borehamwood, new blocks and refurbishments go on while the hospital keeps running, so mastic work is sequenced carefully. Historic houses such as Wyllyotts Manor, 4.3 miles to the north-east of Borehamwood, are a reminder of the older buildings in the wider area, where sealing against old stone, brick or timber needs compatible products.
Borehamwood is about 5 miles east of Watford, in Hertfordshire. Businesses, contractors and managing agents in Borehamwood use us for work on mastic packages. Borehamwood is one of 371 places we cover in Hertfordshire for mastic packages. For work in that direction, see our London page (14 miles or so).
Commercial sites across WD6 are covered. If your site is on Station Road, Canterbury Road and Eldon Avenue or close by, send details and we will quote for mastic packages. You will find Borehamwood on or near the A1 and A5135, so getting applicators and materials to site is simple. Sites close to Borehamwood are covered too, including Well End (1 mile north-east), Green Street (1 mile north), Deacon's Hill (1 mile south), Rowley Green (1 mile east) and Elstree (2 miles south-west). Bigger towns within reach include Watford (5 miles west), Hemel Hempstead (10 miles north-west), St Albans (7 miles north), Welwyn Garden City (10 miles north), Harpenden (11 miles north) and Hoddesdon (13 miles north-east).
What’s near Borehamwood
We work on buildings around Aldenham Country Park, The Pick & Shovel pub and Yavneh College and the streets around them. The nearest railway station is Elstree & Borehamwood station, about 0.6 miles south-west of the centre. Other landmarks nearby include Royal National Orthopaedic Hospital (2.4 miles south-west) and Spires Shopping Centre (3.1 miles east). Not far away are Darland's Lake and Rowley Lodge Field.
What the job involves on each surface
Fire-rated sealant where specified
Where the specification calls for fire-rated or intumescent sealant around service penetrations or linear gaps, we install it to the manufacturer’s tested detail. The design and sign-off of fire stopping sit with the designer, principal designer or fire engineer; we work to the specification and the manufacturer’s installation guidance.
External facade and movement joints
External movement joints often need primer, depending on the substrate. Primer goes on where the sealant maker calls for it, and seal only with a dry joint inside the product’s temperature range.
What sets the cost
To price the job, we consider:
- Whether old sealant has to be cut out first
- Phasing around occupants
- Any access equipment needed
- Location, for remote and island sites
The product called for affects the cost, and so does the preparation, from cutting out to priming and backing rod. Access, phasing and site requirements come into it too.
Before you send an enquiry
There’s no need for a formal survey. These details are enough to start:
- Asbestos survey details if the building is older
- What the building is and how it’s used
- The product your specification calls for
- Rough lengths or quantities, or drawings if you have them
Photos, drawings or a schedule of the joints and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.
Diagnose, treat, sign off
Diagnose, treat, sign off: every visit follows that pattern. We inspect the joints and confirm what’s in scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. Most work in Borehamwood is one building at a time: a school, a unit, an office or a block. We start with your photos, drawings or a site visit, then send a fixed quote.
- First we look at the scope on site or from drawings.
- A fixed quote sets out scope, products and phasing.
- Site paperwork is confirmed and our CSCS-carded applicators are inducted.
- We seal plot by plot or floor by floor in line with the programme.
- Any frame gaps or issues outside our scope are flagged to the site team.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Getting the site ready
- Send any specification or drawings in advance
- Let building users know which areas are affected
- Share the asbestos register for older buildings
Get a fixed quote
Quotes are fixed against the scope you send, so the cost is agreed before work starts. To ask for one, ring 01277 525 020 or email us.
Related advice
Signs you need construction mastic in Borehamwood
On a live site, contamination is the biggest threat to a new joint. Dust, film adhesive, damp and grease on the joint faces prevent a proper bond so faces get cleaned, and primer goes on wherever the maker specifies, even on new work.
Site and facilities staff are often the first to spot these:
- Sealant knocked or painted over by other trades
- Early adhesion failures on new external joints
- Inconsistent sealant finishes from plot to plot
- Caulk cracking where joints are moving more than expected
School extensions, at buildings such as St Teresa Catholic Primary School, usually run to the summer holidays, mastic included.
Questions to ask before you book
- How the existing material will be dealt with
- Which product they’ll use, and why it suits the joint
- Whether their applicators hold CSCS cards
- What site paperwork they can supply
Your questions answered
Will you plan work around the academic year at somewhere like Middlesex University?
Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. Let us know which documents your site asks for, and we will confirm them alongside the quote.
Does your area include sites such as Borehamwood Shopping Park, near Borehamwood?
Yes, sites like Borehamwood Shopping Park are within our area, along with the rest of Borehamwood. Photos and a short description are enough for a first look.
What about RAMS and site documents?
Let us know which documents the site needs, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm them with the quote.
What if there’s asbestos in the old mastic?
Managing asbestos is the dutyholder’s responsibility, so for older buildings we ask for the asbestos register first. If anything suspect turns up, we stop until it’s tested.
How do I request a quote?
There are four steps: send details, get a quote, we seal, guaranteed. The first step only needs photographs and a postcode.
Can you work to our specification?
Yes. Include it with the drawings when you ask for a quote, and the quote will be based on it, flagging anything that needs clarifying.
When can the area be used after sealing?
That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, and we confirm it before leaving site.
Places near Borehamwood
More services for Borehamwood
What happens if it’s left?
It helps to bring the mastic subcontractor in before the package is urgent. We can check joint widths, flag frames with gaps that won’t seal and confirm products against the specification. Called in at the end, the same issues surface during handover. In a town such as Borehamwood, a lot of buildings are older and have been altered over time, and joints where old meets new tend to fail first. Renewing them before water gets in protects the fabric.
Quantities, awkward access and phased working all shape the price. So do site requirements such as inductions and permits.
What you get with us
- Work carried out by CSCS-carded applicators
- Products installed to the manufacturer’s instructions
- One contact handling all your sites
- Sealing commercial buildings since 2005
Read how commercial sealant jobs are priced and our accreditations and insurance.