About KAJK Constructors
KAJK Constructors Inc. is an Ottawa solar contractor that designs, builds and installs solar energy systems, battery storage and EV charging for homes, businesses and industrial sites, and plans green retrofits toward net zero. KAJK was established in 2016, and Khaled Kaddoura has been its president since July 2016. Its office is at 46 Grenfell Crescent, Unit A, Ottawa.
An Ottawa solar contractor, from design to installation
We are Ottawa's reputable source for solar energy solutions, best known for our proficiency in designing and installing solar panels and their required infrastructure.
Our projects run from rooftop solar panel installations to ground mounts, lithium ion battery installations, EV charging stations and small wind turbines. Every project goes from the first assessment through permits, construction and maintenance. The homepage covers solar panel installation in Ottawa, and each service has its own page under energy solutions.
Over the years, we've completed all types of solar energy projects. We've almost done it all: small or large, we can confidently take on any solar project.
KAJK is a member of the Canadian Renewable Energy Association, listed in its directory under Solar Installers, with energy storage and solar as its technologies.
KAJK's track record
Since 2016, in numbers:
- Projects across Canada
- KAJK has proudly been part of over 150 solar projects throughout Canada, and has worked on over 100 projects in the residential & commercial solar/electrical battery storage space.
- Industrial ground-mount solar farms
- From 2016 to 2019, KAJK worked on over 150MW on various industrial ground mount solar farms.
- Panels and foundations
- As a team, we've installed over 500,000 solar panels and more than 55,000 solar foundations, and those numbers are rapidly increasing.
From solar builds to full energy systems: KAJK's timeline
The founding idea was simple: “how can we help our city become a city of the future. That's to strive to have a better quality of life for generations to come. In our view, our path forward was clear.”
2016: phase 1
The phase 1 mission was “to focus on constructing the most affordable Renewable/Sustainable Energy Solutions & Energy management systems with the most advanced available technologies and do it in the best way where we can provide our city tenants with ways to save money on their electrical consumption side while help the city advance to the future in a Energy efficient manner.”
2019: phase 2, green retrofits
Phase 2 was “to expand our offering to the city residents by focusing on green retrofits. Taking old homes and buildings to the 21st century.” KAJK started offering green retrofit solutions, completed its first consultation on a green retrofit, and has provided dozens of consultations since.
2022: full energy management
KAJK began providing full ecosystem energy management solutions: a renewable source combined with battery storage and heating and cooling, monitored by a central energy management system.
Lose less, use less, make more: the three principles
Phase 2 of KAJK's mission takes older homes and buildings into the 21st century through construction built on three energy-management principles. A green retrofit applies them across the building envelope, electrical, mechanical and civil work.
- Conservation
- “simply LOSE as little energy as you can”. On a retrofit this starts with the envelope: roof, walls, windows, doors and foundation.
- Utilization
- “simply USE as little energy as you can”. An efficient building needs less to run.
- Generation
- “simply MAKE as much energy as you can”. Solar and other renewable sources supply what is left.
Leadership, office and service area
Khaled Kaddoura has been President of KAJK Constructors Inc. since July 2016.
The office is at 46 Grenfell Crescent, Unit A, Ottawa, ON K2G 0G4, open Monday to Friday, 9 a.m. to 5 p.m. KAJK serves Ottawa and Ontario, mainly from Alfred in the east to Pickering in the west, and builds ground mounts all across the province. To start a project, book a free assessment.
Our process is simple
If you need solar energy solutions, we'll be there from conception to completion. We have the experience and accreditation to lead the way in all phases of your solar project. Here's what you can expect.
Consultation
From your initial assessment to project management, budgeting, scheduling and acquiring your permits, we handle all major aspects of your project.
Design
We design your solar project to ensure that it meets your needs in the most affordable way possible. We do it all, including system designs to as-built drawings.
Procurement
We acquire the best quality materials for your project at the lowest cost possible, giving you the best value for your dollar.
Construction
Our project manager leads all construction projects to ensure that installation, construction and maintenance projects go smoothly and efficiently.
Warranty, operation & maintenance
Once your system is running, we stay with it: warranty support, operation, maintenance and repairs, including on systems other installers put in.
Green incentives for your solar project
Take advantage of the various incentives and grants available for your solar energy retrofit project. Interest free loans, federal grants, and much more.
Programs change: the federal Greener Homes grant and interest-free loan closed in 2025. Ontario's rebates and the City of Ottawa loan are open, checked on 2026-10-01.
Ontario solar rebates open nowQuestions we get asked
Who is the president of KAJK Constructors?
Khaled Kaddoura. He has been President of KAJK Constructors Inc. since July 2016, the year KAJK was founded. He runs the company from its office at 46 Grenfell Crescent, Unit A, in Ottawa.
Is KAJK Constructors a member of CanREA?
Yes. The Canadian Renewable Energy Association's member directory lists Kajk Constructors Inc under Solar Installers, with energy storage and solar as its technologies, as read on 2026-10-01. CanREA is Canada's renewable energy industry association, and its public directory is where any installer's listing can be checked.
What does KAJK Constructors do?
It designs, builds and installs solar panel systems for homes, businesses, farms and industrial sites, as rooftop arrays, ground mounts or carports, and adds lithium battery storage, EV charging stations and green retrofits toward net zero. Every project starts with a free assessment, followed by KAJK's five steps: consultation, design, procurement, construction, then warranty, operation and maintenance.
What does KAJK mean by a green retrofit?
A planned set of changes that takes an older home or building toward net zero across the four areas KAJK names: building envelope, electrical installation, mechanical installation and civil construction. It rests on the company's three principles: lose as little energy as you can, use as little as you can, and make as much as you can. KAJK has offered green retrofits since 2019.
Sources for this page (3), last read 2026-10-01
- Active member directory: Kajk Constructors IncCanadian Renewable Energy Association, read 2026-10-01
- KAJK Constructors company page and Khaled Kaddoura's profile (President of Kajk Constructors Inc. since July 2016)LinkedIn, read 2026-10-01
- Kajk Constructors Inc, hoursGoogle Maps (KAJK's Business Profile), read 2026-10-01
Contact Ottawa's solar energy experts
Ready to get started? Give us a call or send us a quick message for all your solar and green energy needs. The free assessment looks at your roof or site, your last year of electricity use and what you want the system to do, then comes back with a concept design, costs and the equipment we would use.
Monday to Friday, 9 a.m. to 5 p.m.
Saturday and Sunday: by appointment