
At Ganneston, we offer multi-family residential and commercial construction services including general contracting, construction management, design-build, historic renovations, and metal building systems.
Our decades of experience and commitment to quality provide the basis of all we do, with every type of project and every style of project delivery. However we partner with you, we’ll get the job done right.
General Contracting Services
Ganneston Construction has a solid reputation as one of the most professional and highest quality general contractors in the Maine and New Hampshire areas. We complete projects on time and on budget while still maintaining the highest standards of quality. Ganneston has a wide range of experience in new construction, historic renovations, metal buildings, and more.
Construction Management Services
Ganneston Construction is a full-service construction management firm. We offer a complete range of services to our clients, from pre-construction through project closeout. We are committed to providing the highest level of service and quality possible. We have a proven track record of successful projects, both large and small. Whether you need help with project planning, estimating, scheduling, or any other aspect of construction management, we are here to help.
Let’s get started!
Design Build Services
Ganneston offers design build services for our clients who want a single point of responsibility for their project. We will work with you to develop a project that meets your needs and budget, and then we will manage the design and construction process from start to finish.
For other projects, we offer design-bid-build services, as well.
Work with us.
Metal Building Systems Services
Ganneston has extensive experience in the design and construction of metal building systems. We offer a complete range of services, from pre-construction planning through project completion. We are experts in the use of pre-engineered metal building systems, and we are committed to providing the highest quality products and services possible.
Let’s talk.
Historic Renovation Services
Ganneston has experience in renovating historic buildings to preserve their architecture and character. We understand the challenges that come with working on older buildings and are familiar with the regulations that must be followed.

Commercial Construction Definition
Commercial construction is the process of constructing a commercial building or other type of business facility. Commercial construction includes office buildings, retail stores, restaurants, warehouses, and more. The process of commercial construction can be complex and requires the expertise of a professional contractor like Ganneston.
When you are ready to start your next construction project, contact Ganneston Construction. We have the experience and expertise you need to get the job done right.
Scale of Commercial Construction Projects
The size and scope of commercial construction projects can vary greatly. There are many different types of commercial construction projects, ranging from small, medium, and large-scale projects. Some common examples include:
- Office Buildings
- Retail Stores
- Restaurants
- Theaters
- Warehouses
- Hospitals
- Schools
- Hotels

Commercial Building Construction Types
There are many different types of commercial buildings, and each one has its own unique construction requirements. These structures can often be categorized by how they will be used upon completion.
Planning a multi-family residential building project? Let’s talk.
Commercial Businesses
A building that is designed and built to hold a business, such as a restaurant or retail store, is considered a commercial building. In some cases, a commercial building may also be mixed-use, provided more than 50% of the space is used for commercial purposes.
Commercial and Residential
Commercial and residential construction projects are distinct from one another except in the case of multi-family residential buildings. Multi-family residential buildings with five or more units are considered to be commercial properties.
Commercial and Institutional
Institutional buildings fulfill a service in areas such as public works, healthcare, education, or recreation. Commercial and institutional building construction refers to these facilities when they are used commercially. Examples include:
- Healthcare Facilities
- Doctor or Dental Facilities
- K-12 Schools
- College Campus Buildings
- Fire Stations
- Public Works Facilities
Commercial and Industrial
Put simply, industrial buildings are structures used to make or store things. Commercial and industrial construction services are used for structures that fulfill those purposes as part of a business for a profit.
Commercial Construction Projects from Ganneston
Over the last 58 years, Ganneston Construction has skillfully and successfully completed a variety of commercial building projects for numerous clients. Here are a few examples of our work.
Our Projects
Commercial Building Construction Types

Commercial construction is the process of constructing a commercial building or other type of business facility, such as office buildings, retail stores, restaurants, warehouses, and more.
Residential construction, on the other hand, is the process of constructing a home or other type of dwelling. Residential construction typically refers to single-family homes but can also apply to apartment complexes, senior living facilities, and other structures with one to four units.
The main difference between commercial and residential construction is the type of building that is being constructed. The zoning regulations that apply to each type of project will vary for residential and commercial projects, as well. Commercial construction projects are subject to different zoning regulations than residential construction projects. These regulations can impact the size, height, and location of the project.
Constructing a multi-family residence, such as an apartment complex or condominium, blends commercial and residential construction, requiring that specific regulations are met.

Commercial Building Construction Sequence: What to Expect
The construction of a commercial building can be a complex process. There are many different steps that must be taken in order to complete the project. A commercial construction timeline will vary depending on the type of project, but there are some general steps that are typically followed.
The first step in the commercial construction process is design. It’s important to have a solid idea of what the structure will look like before moving forward. Depending on the structure and site, demolition, excavation, and underground utilities site work may follow. Once the foundation has been poured, the framing of the structure can begin. The next steps in the process will vary depending on the type of project, but these typically include:
- Siding
- Roofing
- Windows
- Doors
- Plumbing and HVAC Systems
- Electrical and Life Safety Systems
- Interior Wall Systems
- Finishes
During the construction project, the building will need to be inspected to ensure that it meets all safety and code requirements, as well.
The commercial construction schedule can vary depending on a number of factors, such as the size and type of building as well as the overall scope of the project. It is important to hire a professional contractor like Ganneston Construction who has the experience and expertise you need to get the job done right.

Cost of Renovation vs New Construction Commercial
There are many factors to consider when deciding whether to renovate an existing commercial building or build a new one. The cost of the project is often the most important factor.
The cost of renovating an existing commercial building can vary depending on the condition of the existing building and the scope of the project. Some renovations may be as simple as painting and carpeting, while others may require more extensive work, such as replacing the roof or HVAC system. The cost of new construction will depend largely on the size and complexity of the project.
Another factor to consider is the time frame. Renovating an existing commercial building can often be done quicker than building a new one. This is because the construction process for a renovation is typically shorter than the construction process for a new build.

Commercial Construction Site Inspection Checklist
It is the responsibility of your contractor, construction manager, or design builder to ensure that the construction project site is safe and that all workers are following safety procedures.
Your contractor should be performing periodic site inspections to ensure that the project site, adjacent properties, construction workers, building occupants, and the general public are safe. At a minimum, the following should be addressed:
- Has a jobsite hazard identification checklist been developed?
- Are all construction workers wearing proper personal protective equipment?
- Is daily housekeeping being followed to manage debris, dust, water, and other potential issues?
- Have electrical, fall, scaffolding, hand and power tools, ladder, hot work, and welding hazards been addressed?
- Are employees being trained daily utilizing a job hazard analysis for each task?
- Are all construction workers following safety procedures?
If you have any concerns, be sure to address them with your general contractor.

Working With Commercial Construction Companies Like Ganneston Construction
When you are ready to start your commercial construction project, it is important to work with a reputable and experienced construction company. Ganneston Construction has the experience and expertise you need to get the job done right. We have a team of professionals who are dedicated to ensuring that your project is completed on time and within budget.
As a full-service construction company, we can work with you from design to post-construction to ensure your satisfaction. Here’s what you can expect.
Pre Construction
The first step in any construction project is the design phase. This is where the plans for the project are created. Ganneston Construction has a team of designers who will work with you to create the plans for your project. Or you can bring your completed design to us. Our team will provide estimates to ensure the project meets your budget.
We also have the experience to offer alternatives to bring the budget back in line without compromising design intent or quality. At the same time, our team will work with you to secure approvals and permits, develop a construction schedule, engage subcontractors, and order materials.
Construction Management
During the construction phase, our team will be on site to manage the project. We will coordinate with subcontractors and workers to make sure that the project meets quality standards, progresses according to schedule, and stays within budget.
Post Construction
After the project is completed, our team will perform a final walkthrough with you to make sure that you are satisfied. We will also be the point of contact for the warranty period should any issues arise.
Ganneston Construction is your one-stop shop for all your commercial construction needs.
Frequently Asked Questions About Maine Commercial Construction Services
What is commercial construction?
Commercial construction is the process of constructing a commercial building. Typically, a commercial construction project is any construction project that is not for a private residence, with examples like office buildings, retail stores, warehouses, and much more.
What are the steps in commercial construction?
The steps in commercial construction generally include pre construction, construction management, and post construction.
What is the difference between commercial and residential construction?
Commercial construction generally refers to the construction of office buildings, retail stores, warehouses, multi-family residential with five or more units, and other types of commercial buildings. Residential construction, on the other hand, generally refers to the construction of homes and other types of residences up to four units.
What is commercial construction management?
Commercial construction management is a type of delivery method for a commercial building project. This is a collaborative approach where the construction manager participates during the design development process by providing estimates rooted in experience to ensure the owner’s project goals are met and the project is delivered on time and within budget.
What qualities should you look for in a commercial construction company?
When you are looking for a commercial construction company, you should look for a company like Ganneston that is experienced and has a good reputation for quality, customer service, and timeliness. You should also make sure that the company is insured.
Use Ganneston Construction Commercial Construction Services for Your Next Project in Maine or New Hampshire
Ganneston Construction is a full-service commercial construction company based in Maine. We offer a variety of services to our clients, from design to post-construction. We are dedicated to providing the best possible service to our clients and ensuring that their projects are completed on time and within budget.
No project is too large or too small for us to discuss! Our priority is getting the job done right, no matter its sector or size.
Use Ganneston Construction Commercial Construction Services for Your Next Project in Maine or New Hampshire
Ganneston Construction operates across Maine and New Hampshire. Here are the counties where we work in Maine:
- Androscoggin
- Aroostook
- Cumberland
- Franklin
- Hancock
- Kennebec
- Knox
- Lincoln
- Oxford
- Penobscot
- Piscataquis
- Sagadahoc
- Somerset
- Waldo
- Washington
- York