K&J Group
VVS-installation
Gothenburg — installation, prefabricated

An engineering group for built installation.

Engineering design, prefabrication and contracting under one roof. We move the work from the site to the workshop — and take responsibility all the way to a commissioned system.

−90%
Time on site
−85%
Carbon footprint
<1%
Waste, vs 8–15

Three companies, one commitment

What costs time and money appears in the seams between design, delivery and assembly. We own the whole chain, so the seams disappear.

Projektering
K&J Consult

Technical installation consultancy

Technically complex design of piping and ventilation, project and construction management, statutory inspection duties, surveying and 3D scanning. Founded in 2019, the company has since worked on some of the region's most installation-dense buildings.

Prefab
K&J Prefab

Smart prefabricated solutions

Fabrication drawings, kitting and finished cassettes, heating substations and pump racks from our own workshop. Clamps pre-mounted, every part position-tagged against the model, packed in assembly order.

Entreprenad
K&J Contract

Contracting built around prefab

We carry out the technically intensive parts ourselves and take over warranty responsibility for installation and materials. Relief for the project manager — higher turnover with a smaller workforce.

The method

From chaos to order.

A traditional project spends four of every five working hours on site — cramped, dusty, weather-dependent and hard to measure. We invert the ratio: design and fabrication run in parallel in the workshop, and what reaches the site is lifted in and connected.

The result isn't only faster. It is measurable, and it is the same every time.

Working hours per project
Traditional80 / 20
Prefab20 / 80
On site Workshop & design

What it means in practice

We measure our projects. When the work moves to the workshop, time on site shrinks by up to ninety per cent, waste stays below one per cent instead of eight to fifteen, and the carbon footprint of the pipework drops by roughly eighty-five per cent.

Just as important: no sparks, no dust and, so far, zero injuries or incidents. Cleaner air, cleaner floors and a working environment that can actually be planned.

The difference shows most in tight plant rooms — where traditional assembly takes weeks, we lift in finished cassettes and connect them.

”I can't even understand how a space this tight, with this many installations, could be built using traditional methods.”
Tommy Dennerlöv, project manager, SweRör
”It is simply remarkable that half a kilometre of pipe can be unloaded and installed in that little time.”
Jimmie Sjölund, project manager, Ullevi Rör
Plant room
Plant room, commissioned
Pump rack
Pump rack, workshop

What we offer

01

A strong technical partner from design through commissioning.

02

Project optimisation and cost savings through smart design and prefabrication.

03

Relief for project managers and lead fitters on the technically intensive parts.

04

Higher turnover with a smaller workforce.

05

Limited risk — we take over warranty responsibility for installation and materials.

The team

Engineers, project managers and fitters with backgrounds on both the consultancy and the contracting side. That is why we recognise the problems before they get expensive.

portrait
Kristofer Johansson
Founder — background in electronics and software development
portrait
Namn Namnsson
Lead engineer, design
portrait
Namn Namnsson
Workshop manager, prefab
portrait
Namn Namnsson
Project manager, contracting
portrait
Namn Namnsson
HVAC design engineer
portrait
Namn Namnsson
Lead fitter
The workshop in Askim

Get in touch — we answer the same day.

We are also hiring continuously — design engineers, project managers and fitters in the Gothenburg area.

Contact
Visit & post
Hantverksvägen 1
436 33 Askim, Sweden
Companies
K&J Group Sweden AB
K&J Consulting Scandinavia AB K&J Prefab AB K&J Contracting AB
K&J Group © 2026 K&J Group — Gothenburg, Sweden