DIY vs. Contractor vs. Full-Service Window Replacement: Which is Best?

Are you considering replacing your windows but don’t know if you should do it yourself or hire someone to do it? After all, window installation matters almost as much as the windows themselves. In this article, we’ll explain the pros and cons of replacing your windows yourself, hiring an independent contractor to install replacement windows, or going with a full-service replacement company that handles every step of the process. By the end of this article, you’ll have a good sense of what factors to consider for each installation method, pros and cons of these options, and what you can expect for each option.

Option 1: Should You Replace Your Own Windows?

If you’re looking at your old, leaky windows thinking, “Can I just replace them myself?” The answer is...maybe. This path involves purchasing windows from a home improvement store (like The Home Depot, Lowes, etc.) or online retailer and installing them yourself.

Replacing your windows is a big job and requires some expertise, so it’s important to consider your own carpentry skills before tackling this project. According to This Old House, this project requires a fair amount of carpentry skills and home-remodeling experience and usually takes 4-6 hours per average-sized window on the ground floor.

A factor to consider is whether your installation requires insert or full-frame units. The latter takes significantly more time, knowledge, and skill. It can get trickier when you have an older home with original window mechanisms like sash weights and counterweights.

What are the pros and cons of replacing your own windows?

Pros to DIY window replacement:

• Lower upfront costs and usually overall costs
• Complete control over the project timeline

Cons to DIY window replacement:

• Requires significant time and skill
• Improper installation can lead to leaks, water damage, and/or lack of energy efficiency
• You are responsible for any mistakes in installation

Replacing your own windows is best for:

• Experienced DIYers with previous home renovation experience who are comfortable taking on a complex project and its risks

Option 2: Can I Hire A General Contractor?

When you hire a general contractor for your window replacement, you’re inviting a professional to handle most of the process. Sometimes you’ll purchase the windows yourself from a home improvement store, specialty dealer, or online retailer, and sometimes the contractor will give you options to choose from based on their brand experience and geographic knowledge.

If you feel like your DIY skills aren’t up to what it takes to replace your windows, hiring a contractor can be a good option. They bring their expert recommendations and experience so you can relax.

Once the products are chosen, your contractor handles the all-important (and sometimes tricky) job of installation—bringing their expertise in everything from framing to weatherproofing and finishing touches.

In short, this option is perfect for homeowners who appreciate flexibility and want to leverage a professional’s installation skills while maintaining control over product choices, costs, and job scheduling. It’s also great for those with experience managing home projects or with a trusted contractor on speed dial.

What are the pros and cons of working with a contractor?

Pros to using a contractor for window replacement:

• You get professional installation experience
• Sometimes you get flexibility to choose windows from any manufacturer

Cons to using a contractor for window replacement:

• May need to coordinate between window supplier and contractor
• May have to juggle multiple warranties
• Manufacturer's warranty may not cover installation
• Windows are most likely not custom made for your home

Using a contractor for replacing windows is best for:

• Homeowners who want professional installation and are willing to hire their own contractor for the project

Option 3: Should I Hire a Full-Service Window Replacement Company?

Companies like Renewal by Andersen handle everything in a window project, from the initial design consultation to manufacturing, installation, service, and warranty.

This is an especially good option for replacement jobs involving oddly sized windows, older homes with challenging architecture, or tricky second-story installations where safety is a factor.

What does the process look like with full-service window replacement?

Every company is different, but a company like Renewal by Andersen coordinates every stage.

• Personalized in-home design consultation: You’ll sit down with an expert (sometimes over coffee, sometimes over blueprints) to discuss your goals, style preferences, and the unique needs of your home.
• Custom measurements: Think of it as tailoring, but for your curb appeal—providing a perfect fit that helps maximize energy efficiency and keep winter drafts (and summer heat waves) at bay.
• Custom manufacturing: Once the measurements and selections are in, your custom windows are made to order—no “one-size- fits-all” approach here. Renewal by Andersen windows are custom manufactured in Minnesota and shipped to the local retailer closest to your home.
• Professional installation: Typically completed by a team trained specifically in that company’s products and methods, like our Certified Master Installers. This streamlined approach means less room for finger-pointing if issues arise; everything’s under one roof, from start to sparkling finish.
• Post-installation support: Every company’s warranty is different, but most full-service companies have a warranty (or warranties) that cover the product, installation, or both. It’s important to check the fine print here. Learn about the Nation’s Best Warranty from Renewal by Andersen.

Full-service replacement companies, like contractors, typically work on a schedule. But unlike a single contractor, full-service companies have a whole team to complete the installation. This means it takes less time—sometimes as quick as a single day.

More questions about what the replacement process looks like? Read FAQs on Renewal by Anderson’s window replacement process.

What are the pros and cons of full-service window replacement?

Pros to full-service window replacement:

• One-company accountability from start to finish
• Expert design consultation
• Custom-built windows
• Usually one warranty that covers product and installation
• Streamlined communication

Cons to full-service window replacement:

• Typically higher cost compared to DIY or hiring a contractor
• No flexibility to mix products from different manufacturers

Using a full-service company for replacing windows is best for:

• Homeowners who want an easy process with one company handling everything from start to finish and are willing to invest in a premium experience

What Do the Experts Say About Replacing Your Own Windows?

Ross Trethewey is a big advocate for correct, professional installation.

As Ross Trethewey, Building Engineer on Ask This Old House, puts it: “You can have the best window in the world. And if it's not installed right, you're not going to have a great outcome.”

According to ENERGY STAR, “Even the best windows, doors, and skylights can be drafty if they are poorly installed.” It recommends seeking out professionals certified to install the specific ENERGY STAR® certified replacement windows and doors you have selected for your home.

Water damage on windowsills due to the previous homeowner installing the window themselves.

Take it from Liz Rishel, a DIY pro and Renewal by Andersen brand ambassador. When she bought her beach cottage in Florida, she noticed water damage on a few of the windowsills. She later discovered the previous homeowner improperly installed windows themselves, leading to water leakage inside the home. “Even though I’m a DIYer, there are some projects you just shouldn’t DIY, and windows and doors are definitely two things on that list. I’m going to trust the pros on those projects,” Rishel says.

Even homeowners have opinions about DIYing. Paul, a Philadelphia homeowner and Renewal by Andersen customer, said, “I feel the product is very expensive. But what isn’t these days? Looking at buying at the DIY store and having it installed would be equally expensive, but the quality wouldn’t come close. The financing helped to keep the purchase within budget.”

And Laura from Arizona agreed: “I have never purchased windows before and there were cheaper options, but I didn't want to worry about anything. I knew I wanted the full service that Renewal by Andersen promised to deliver. Everything progressed like a well-oiled machine and I am truly grateful.”

Frequently Asked Questions About Window-Replacement Methods

How do the costs compare between DIY, hiring a contractor, and full-service replacement?

Taking the DIY route usually costs the least upfront because you only pay for the materials. Hiring an independent contractor adds labor costs to the price of the windows. A full-service replacement company typically requires a higher initial investment because you’re hiring one company to handle the entire project.

How long does it actually take to replace windows?

If you decide to tackle the project yourself, expect to spend about four to six hours on a single ground-floor window. Contractors will work on their own timeline, which might require some juggling with your schedule. On the other hand, a full-service replacement company brings an entire specialized team. They can often complete an entire home installation in a single day. You can leave for work in the morning and come home to a beautifully transformed house!

Do I need special skills to install my own windows?

Yes, you certainly do. Swapping out windows is a complex project that requires solid carpentry skills, specific tools, and home remodeling experience. Even a small miscalculation can lead to water leaks, drafty rooms, or damage not covered under warranty. If you do not feel completely confident wielding a pry bar and a level, trust the professionals to handle the heavy lifting.

What happens to the warranty if I install the windows myself or use a contractor?

This is a crucial detail to check. When you buy windows from a store, the manufacturer warranty typically only covers the product itself. If you or a contractor make a mistake during installation, the warranty may not cover the resulting damage. Full-service replacement companies usually offer comprehensive warranties that cover both the windows and the installation, so you don’t have to worry about finger-pointing if an issue arises.

Can I mix and match window brands if I hire a contractor?

Sometimes. Hiring an independent contractor can give you the flexibility to purchase windows from any home improvement store or online retailer. Just keep in mind that you will be responsible for managing the different product warranties and coordinating the delivery with your contractor's schedule.

Choosing the right window replacement method depends on your budget, skills, and goals. We’ve covered the pros, cons, and considerations of each option and who it’s best for.

DIY is best for you if you have a low upfront budget, if you have previous experience with home renovation (ideally installing windows), and if you’re comfortable taking on a complex project and its risks.

Hiring a contractor is best for you if you want professional installation and are willing to manage the hiring and scheduling of a professional.

Full-service window replacement is best for you if you want an easy process with one company handling everything from start to finish, and you're willing to invest in a premium experience.

At the end of the day, it’s your home, so only you can make the decision for yourself. Maybe you’ve come to the end of this guide and decided you don’t want to deal with the risk of DIY or the juggling that can come with hiring a contractor. So, if you’re ready to explore full-service replacement, Renewal by Andersen is a great choice. Schedule a free consultation.