Welcome to DNS Exterior Inc.

DNS Exterior is a local expert in installation of windows, siding, gutters, and roofing. Based in Lockport, Illinois, in the Chicago suburbs, we enjoy working with our clients, both residential and commercial to improve the beauty and efficiency of their homes and businesses.

We do quality work at reasonable rates and enjoy working with clients to find the perfect match for their needs and budget. We would love the opportunity to speak with you about your needs and provide an estimate.

DNS Exterior began with one main goal and that was to provide our customers with the most up to date technology and most efficient products that are available to our industry. Since our inception, we have achieved this goal by attending yearly trade shows to keep up to date on the newest products available, as well as re-certification courses for our installers.

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How to choose a contractor:

  1. Look at Credentials

    Find out whether DNS Exterior Inc. holds all the required licenses from state and local municipalities, along with designations from any professional associations such as the National Kitchen & Bath Association, the National Association of the Remodeling Industry and the National Association of Homebuilders. Look for contractors, like DNS Exterior Inc., who have invested in course work and passed rigorous tests to earn particular certifications. Be aware, however, that not all certifications are created equal. Do some homework and find out the requirements.
  2. Pick a Contractor Who Specializes in Your Project Type

     It’s important to research contractors to know if they have experience in a type of project. Today, so many projects are regulated and code-specific that you want someone who knows the details of what’s required.

    Pros, like DNS Exterior Inc., often take classes and research the kinds of projects they undertake, so they’re experts in their fields. This enables them to address potential problems and perform the work correctly. A good remodeler knows how to anticipate the nuances of the work.

    If you’re asking several contractors for a bid, make sure each one is using the same set of plans and specifications, the National Association of Home Builders (NAHB) advises on its website: “You can’t effectively compare estimates from contractors who plan to use different brands of building materials.”

  3. Do Phone Interviews

    Call DNS Exterior and ask them the following questions:


    1. Do they take on projects of your size?
    2. Are they willing to provide financial references, from suppliers or banks?
    3. Can they give you a list of previous clients?
    4. How many other projects would they have going at the same time?
    5. How long have they been in business?
  4. Check ReferencesAsk to see some of DNS’s projects. If you approve of them, request references and call DNS’s former customers to check up on them. Ask how the DNS did at executing the projects. Were they on time and on budget? Were the customers pleased with the outcome? Was there anything that could have been done differently?
    Remember that when you’re hiring someone to install doors, windows, siding, gutters, or roofing, you are buying a service and not a product. Quality of service will determine the quality of the finished project.