Penge construction mastic
Mastic packages for new-build and refurbishment projects in Penge and across Greater London. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Inconsistent sealant finishes from plot to plot
- Perimeter gaps outside the sealant’s range
- Bath and shower joints scraped during the final clean
Need construction mastic in Penge?
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Your questions answered
Can you work in a London building with booked loading and goods-lift slots?
Yes, we plan every London job around the building’s own access rules. Say when the building is occupied and when it’s quiet, and we will plan accordingly. The ULEZ covers the whole of Greater London, which we allow for
Will you take on work at estates like Franklin Industrial Estate, close to Penge?
Yes. We cover Penge and the area around it, including industrial estates, business parks and retail parks such as Franklin Industrial Estate. A few photographs and the unit address let us price the work.
Do your applicators hold CSCS cards?
Our applicators hold CSCS cards, and we are CHAS accredited and a Constructionline member. We’re also fully insured, with five million pounds of public liability cover.
Do you do fire-rated sealing on new builds?
We install fire-rated sealant where it is the specified product. If the detail calls for collars, wraps or batts instead, we will tell you.
What guarantee comes with a mastic package?
Each package is backed by a 12-month guarantee. We are also fully insured for public liability.
What’s the quickest route to a quote?
It works in four steps: send details, get a quote, we seal, guaranteed. Step one needs little more than photographs and a postcode.
Is it fine to apply new sealant on top of old?
No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.
Construction mastic for commercial buildings in Penge
Perimeter sealing outside needs a dry joint and the right temperature. Each sealant has a temperature range, and damp, frost or condensation on frames stops work, so we plan elevations with the forecast and the programme in mind. Internal areas can usually carry on while the outside waits. We work on floor and skirting junctions, cladding and panel joints and internal decorators’ caulk, and the usual reasons a site gets in touch are sealant knocked or painted over by other trades and frame gaps too wide for sealant alone. Looking for mastic applicators who cover Penge? We’ve been sealing commercial buildings since 2005, with CSCS-carded applicators.
A great deal of London construction is refurbishment of occupied or part-occupied buildings, alongside new blocks. Replacement windows, recladding and fit-outs leave perimeter and facade joints to seal, often next to people still using the building, so tidy, well-planned work matters.
The 12-month guarantee is for workmanship rather than wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we spell out the cover before we begin.
- Where
- Penge (SE20, SE19, SE26)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Price
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Towns and villages near Penge
Other services in Penge
Why act early in Penge
Getting the mastic contractor involved early pays off. We can check joint widths, flag frames with gaps that won’t seal and confirm products against the specification, which avoids last-minute problems. Called in at the end, the same issues surface during handover. Getting scaffold, permits or access booked in Penge takes effort, so it makes sense to deal with every failing joint while access is in place.
Larger quantities, tricky access or phasing all shape the price. So do site requirements such as inductions and permits.
Why clients in Penge choose us
- Fully insured
- A range of standard colours, depending on the product
- Work carried out by CSCS-carded applicators
- Matching to RAL references, product permitting
See what affects the cost and our accreditations and insurance.
New build and refits around Penge
The ULEZ covers the whole of Greater London, Penge included, so site vehicles need to meet its standards or pay the daily charge. Add booked deliveries and tight storage, and the mastic package needs planning with the site team. There are a number of hotels within about 2 miles of Penge. Hotel extensions and refits typically have to fit around bookings, so mastic dates are tight.
New units and refits on sites such as Franklin Industrial Estate, under half a mile to the south-east of Penge, need their panel and perimeter joints sealed to the specification. Hospital estates such as British Home & Hospital for Incurables (2.1 miles west of Penge) tend to grow and change in phases, often next to occupied wards, so facade and perimeter sealing has to fit the estates team’s plan. For contractors on a campus like King's College London, 3.9 miles north of Penge, facade and perimeter sealing has to fit around students and term dates.
Penge is about 1 mile west of Beckenham, in Greater London. We cover commercial sites throughout Penge. Across Greater London, 764 places are covered, including Penge. We also cover London, around 6 miles from Penge.
We cover the SE20, SE19 and SE26 postcode districts. Among the streets we cover are High Street, Anerley Station Road and Station Road, and sites on any of them can send details for a fixed quote. Being close to the A234, Penge is straightforward for us to reach. We also cover Anerley (1 mile west), Crystal Palace (1 mile north-west), Sydenham (1 mile north), Gipsy Hill (1 mile north-west) and Upper Norwood (1 mile west). A short drive away, we cover London (6 miles north), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (8 miles north-west), St Pancras (8 miles north) and Shoreditch (8 miles north).
Landmarks near Penge
Around Penge, our work takes us to commercial buildings near Crystal Palace School, Crooked Billet pub and Crystal Palace Dinosaurs and the streets around them. There’s a railway station in Penge itself: Penge West station. Nearby you’ll also find St Christopher's Hospice (0.5 miles north) and Crystal Palace Museum (0.8 miles north-west). The countryside around Penge includes Dulwich Upper Wood and Knight's Hill.
What the job involves on each surface
Kitchens and utility areas
Kitchen joints are sealed after fitting and before final clean. A kitchen-suitable sealant is used and hygienic or food-safe grades wherever food contact is possible.
Internal decorators’ caulk
Caulking is often done in a hurry by whoever’s on site. Done properly, it saves decorators time and gives a clean line.
General trades versus a specialist
General builders and handymen seal joints, but it isn’t their main trade. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint, which is what makes a joint last.
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
Our process
Site rules come first: sign-in, induction and whatever permit system the building uses. Once we’re cleared to begin, the joints are worked through in the order agreed with your site contact. All of Greater London is in the ULEZ, and kerbside space in Penge can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- We walk the site or review drawings to understand the package.
- You receive a fixed quote covering scope, products and sequence.
- Paperwork is agreed and applicators are inducted on site.
- Sealing follows the programme as areas are released.
- Any frame gaps or issues outside our scope are flagged to the site team.
- Final snagging is completed and the 12-month guarantee applies.
Before we start on site
- Flag any permit to work we will need
- Point out any areas we must not close
- Let building users know which areas are affected
Request a quote
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to phone 01277 525 020 or email a schedule or drawings with what you know.
Advice
Quoting for work in Penge
Each job is priced on its own details. The main factors are:
- Quantities, in metres or numbers
- The site’s rules and procedures
- Working within restricted access windows
- How accessible the joints are
No two sites price the same: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.
Details that help us quote
There’s no need for a formal survey. These details are enough to start:
- Whether an asbestos survey exists
- Specification clauses that apply
- What the building is and how it’s used
- Anything awkward about access or site hours
A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Send what you have, and we will arrange a site visit if anything is unclear.
When it isn’t the sealant
Part of a good diagnosis is knowing where sealant stops. We will tell you if the real problem is any of the following:
- Approving fire stopping as compliant
- Defective windows, doors or glazing units (the supplier or installer’s job)
- Oversized gaps that need packing or adjustment by others
Not sure which it is? You can call the office on 01277 525 020 or use the quote form and we will tell you honestly.
Where we work in Penge
- Window and door perimeters
- Sanitary and kitchen joints
- Floor and skirting junctions
- Brick and block movement joints
- Internal decorators’ caulk
- Cladding and panel joints