"Loved working with Mark and his guys! Love our new sunroom even more! Mark was open and honest from the very first call, never salesy. He was a great resource in helping us finalize the design."
Eric Schuster
Verified Google Review
Maryland Sunroom Builders
Sunroom Builders and Installers Serving Central Maryland
Custom three-season and four-season sunrooms across Harford, Baltimore, Cecil, Anne Arundel, and Howard County. Designed, permitted, and built by our own crews, with a lifetime-warrantied Sunspace enclosure.
4.9 stars on Google•101 Google reviews•MHIC #91686
How to Choose a Sunroom Company
How to choose the best sunroom builder in Maryland
Most sunroom companies in Maryland are dealers who sell you a kit and subcontract the install to whoever is available that month. That is where the problems start. The enclosure might be excellent, but the footing, the flashing, the roof tie-in, and the electrical are what decide whether the room leaks in five years.
We design, permit, and build the whole thing with our own crews. One company is responsible for the slab, the structure, the enclosure, and the finish work, which means there is nobody to point at when something needs fixing.
It helps to know who does what. A sunroom dealer sells the enclosure. A sunroom installer assembles it. A sunroom contractor, which is what we are, is responsible for the footing, the structure, the roof tie-in, the permits, the electrical, and the enclosure itself.
We wrote the longer version of this: How to spot professional sunroom workWhat to ask any sunroom company before you sign
- Are you MHIC licensed, and what is the number? Ours is 91686.
- Do your own employees do the installation, or is it subcontracted?
- Who pulls the permit and meets the inspector?
- Is the enclosure warranty from the manufacturer, and what does it actually cover?
- How do you tie the new roof into the existing one, and how is it flashed?
- Can I see finished work you built in my county?
Why Custom Design & Build
One company, start to finish
Built by Our Crews
No subcontractors. The people who design your sunroom are the people who build it.
Authorized Sunspace Dealer
Factory-trained on Sunspace engineering and warranty service, so the enclosure is installed to spec and the warranty holds.
Permits and Inspections Handled
We file the permit, meet the inspector, and coordinate electrical and HVAC. You are not managing trades.
Thirty Years in Central Maryland
Hundreds of finished rooms across five counties, and 101 Google reviews at 4.9 stars.
Sunroom Systems We Build
Three-season rooms, four-season rooms, and screen rooms
We are local sunroom builders in Central Maryland, and Sunspace sunrooms are modular and custom-built to install onto an existing deck, patio, or even under a roof you already have. The four models step up in comfort and season. Start with the Model 100 screen room for bug-free open air. Move up to the Model 200 WeatherMaster, our most popular, with vinyl windows that open up to 75 percent. Choose the Model 300 for a bright glass three-season room. Or go all the way to the Model 400, a fully insulated four-season room you can use year round. We help you match the model to how you want to use the space.
- Model 100 screen room for bug-free open air
- Model 200 WeatherMaster vinyl windows, our most popular
- Model 300 bright glass three-season room
- Model 400 insulated four-season room for year-round use
The Sunspace Lineup
Find the right sunroom for your space
Screen Room
Model 100
A custom aluminum screen room for bug-free open-air living, upgradeable to vinyl windows.
Learn MoreWeatherMaster Sunroom (Most Popular)
Model 200
Vertical 4-track vinyl windows that open up to 75 percent, then close tight against weather and bugs.
Learn More
3-Season Sunroom
Model 300
A bright glass room on extruded aluminum, with double-roller windows that vent from both sides.
Learn More
Insulated 4-Season Sunroom
Model 400
Thermal walls, Low-E argon glass, and an optional insulated floor for true year-round comfort.
Learn MoreBacked for Life
Sunspace Limited Lifetime Warranty
Your Sunspace sunroom is covered by a limited, non-prorated manufacturer warranty. Many of the core components are warranted for as long as you own your sunroom, and our installation work is backed by the Custom Design and Build workmanship guarantee.
Lifetime
Laminations & Finishes
Expanded polystyrene panels are warranted free of blistering, chipping, cracking, peeling, and delamination for as long as you own your sunroom.
Lifetime
Window & Door Glass Breakage
Tempered glass units in windows and doors are warranted against breakage in residential use for as long as you own your sunroom.
Lifetime
Vinyl Extruded Components
Warranted free from peeling, flaking, blistering, and corroding for as long as you own your sunroom, under normal residential use.
Lifetime
Hardware & Screen Units
Door rollers, latches, moving parts, other hardware, and screen units are warranted for as long as you own your sunroom.
15-Year
Insulating Glass Units
Insulated glass units are warranted for 15 years from installation against seal failure that causes permanent fogging between the glass.
10-Year
Vinyl Glazed Windows
Vinyl glazed windows are warranted for 10 years from installation against fading and cracking, provided the cleaning instructions are followed.
The fine print
This limited warranty is provided by Sunspace Modular Enclosures Inc., the manufacturer, to the original purchaser, and covers materials and factory workmanship. Coverage is limited to repair or replacement of any Sunspace-manufactured component found to be defective within the periods above. If repair or replacement is prohibitively costly, the manufacturer may instead refund the purchase price of the claimed product.
Not covered: existing site conditions, and workmanship or materials supplied or completed by others. Materials not manufactured by Sunspace are not covered. Vinyl extruded components are not warranted against discoloration caused by air pollution, harmful chemicals, or normal weathering and fading from the elements.
Vinyl is not glass and needs gentle care. Do not use harsh cleaners, detergents, or any formula containing bleach. Following the Sunspace cleaning instructions is required to keep the 10-year vinyl glazed window coverage in effect.
Sunspace is not responsible for indirect, punitive, special, incidental, or consequential damages. This warranty does not apply to products damaged or found defective due to improper handling, operation, or maintenance, or due to site conditions or work by others. Ask us for the full written warranty terms for your model.
Recent Projects
A few of our recent sunroom builds
What Homeowners Say
Real feedback from Maryland homeowners
"We started with a wooden deck and screened enclosure that was rarely used and ended up with a beautiful composite deck and sunroom that we enjoy daily. We greatly appreciate the skilled craftsmen."
Deborah Thomas
Verified Google Review
"Mark was fantastic to work with from start to finish. He's incredibly knowledgeable and took the time to explain everything clearly. The entire experience was smooth, professional, and exceeded our expectations."
Brandon Herd
Verified Google Review
Where We Build
Sunroom installation across five counties
We design, permit, and install sunrooms throughout Harford, Baltimore, Cecil, Anne Arundel, and Howard County from our Fallston office. Find your county or town below.
- Sunrooms in Harford County
- Sunrooms in Baltimore County
- Sunrooms in Cecil County
- Sunrooms in Anne Arundel County
- Sunrooms in Howard County
- Sunrooms in Bel Air
- Sunrooms in Fallston
- Sunrooms in Severna Park
- Sunrooms in Annapolis
- Sunrooms in Columbia
- Sunrooms in Ellicott City
- Sunrooms in Towson
- Sunrooms in Perry Hall
Sunroom builders near you
Help Me Choose
Common questions, clear answers
What is the difference between a sunroom builder and a sunroom installer?
A sunroom dealer sells the enclosure and hires someone else to install it, and a sunroom installer assembles it. A sunroom contractor, like us, is responsible for the whole room as one job: the footing, the structure, the roof tie-in, the permits, the electrical, the enclosure, and the finish work. We are an authorized Sunspace dealer and the contractor, so there is a single point of responsibility for the whole room.
Do you build four-season rooms?
Yes. The Sunspace Model 400 is our insulated four-season room, with thermal walls, Low-E argon glass, and an optional insulated floor, built for year-round use.
Which counties do you install sunrooms in?
We install sunrooms in Harford, Baltimore, Cecil, Anne Arundel, and Howard County, Maryland, from our Fallston office. That includes Bel Air, Forest Hill, Fallston, Aberdeen, Havre de Grace, Joppa, Jarrettsville, Edgewood, Towson, Cockeysville, Perry Hall, White Marsh, Elkton, North East, Chesapeake City, Severna Park, Crofton, the Annapolis area, Columbia, and Ellicott City. We are licensed under MHIC #91686.
How do I choose between the Sunspace models?
Start with how you want to use the space. The Model 100 screen room is for bug-free open-air living. The Model 200 WeatherMaster is our most popular and the best all-rounder, with vinyl windows that open up to 75 percent. The Model 300 is a bright glass 3-season room. The Model 400 is fully insulated for year-round use.
What is a WeatherMaster window?
WeatherMaster is Sunspace's exclusive vertical 4-track vinyl window. It opens up to 75 percent for full ventilation, then closes tight to keep out bugs, rain, and UV.
Which models can I use in winter?
The Model 400 is fully insulated for true year-round use. The Model 100, 200, and 300 are three-season or open-air rooms, so they are best used from spring through fall in Maryland.
Can you convert my existing porch or deck?
Yes. Sunspace rooms are modular and built to install onto existing decks, patios, and covered porches.
Do you handle permits?
Yes. Permit requirements vary by county and structure. We handle the permit process as part of the project.
What is the warranty?
Sunspace backs your sunroom with a limited lifetime warranty. Core components, including the laminations and finishes, the vinyl extruded frame components, the window and door glass against breakage, and the hardware and screen units, are warranted for as long as you own your sunroom. Insulating glass units are covered for 15 years and vinyl glazed windows for 10 years from installation under normal residential use. Our installation work is backed by the Custom Design and Build workmanship guarantee. Ask us for the full written warranty terms.
Who are the best sunroom builders in Maryland?
Look for three things: an MHIC license you can verify, crews employed by the company rather than subcontracted, and finished work you can go look at in your own county. We are MHIC #91686, we build with our own crews, and we have thirty years of finished rooms across Harford, Baltimore, Cecil, Anne Arundel, and Howard County.
How long does a sunroom take to build?
Most projects run several weeks on site once the permit is issued, with the enclosure manufactured to order in parallel. We give you a real schedule at proposal.
Learning Center
Sunrooms & Three-Season Rooms guides
Sunrooms
How Much Does a Sunroom Cost in Maryland? 2026 Prices by Type and Size
What a sunroom costs in Maryland in 2026, by type, Sunspace model, and size: three-season, four-season, screen rooms, porch enclosures, and patio covers.
Sunrooms
Four-Season Rooms in Maryland: Insulation, Heating, and What They Cost
What makes a sunroom a four-season room, how it is heated and cooled, and what it costs in Maryland compared with a three-season room.
Comparison Guides
Sunroom vs Three-Season Room vs Screen Room: Which Is Right for Your Maryland Home?
A clear comparison of sunrooms, three-season rooms, four-season rooms, and screen rooms: seasons of use, ventilation, heating and cooling, and price.
Sunrooms
The Sunroom Installation Process, Step by Step
What happens from the first phone call to the final walkthrough when a licensed Maryland contractor installs a sunroom, and what to expect at each stage.
Sunrooms
Can My Deck Support a Sunroom? What Maryland Homeowners Should Check
Why an enclosed room loads a deck differently, what a contractor checks before building on one, and your options if the deck is not strong enough.
Sunrooms
Converting a Screened Porch to a Sunroom in Maryland: Options and Cost
How to turn a screened or covered porch into a sunroom with a walls-under system, what it costs, and what your existing porch needs to be ready.
More sunroom guides
- Snow & Ice Damage to Sunrooms and Porches: Prevention, Safe Removal, and Why Professional Construction Matters
- How to Spot Professional Sunroom Work
- Can You Heat a Three-Season Room? What Maryland Homeowners Need to Know
- Permit & Zoning Checklist for Building a Three-Season Room in Harford County
- Three-Season Rooms in Maryland: Benefits, Year-Round Use, and Who They're Right For
- How a Three Season Room Can Increase Your Home’s Value in Maryland
- Heating up your outdoor space
- Eze-Breeze vs Sunspace WeatherMaster: An Honest Comparison for Maryland Porches
- Sunroom Roof Options: Cathedral, Studio, and How the Tie-In Works
- Sunroom vs Home Addition: Which Makes More Sense for a Maryland Home?
- Sunroom Flooring Options: What Works in a Maryland Sunroom
- How Long Does a Sunroom Last? Why Some Last Decades and Others Don't
- Sunroom Windows: Vinyl vs Glass, and Which Is Right for You
- How to Keep a Sunroom Cool in a Maryland Summer
- How to Check a Sunroom Contractor's License and Credentials in Maryland
- Sunroom Maintenance and Repair: A Seasonal Checklist for Maryland
- Sunroom Permits in Maryland: Harford, Baltimore, Cecil, Anne Arundel, and Howard County
Ready to Build?
Let's talk about your outdoor space.
Start with a free phone conversation. We'll learn about your project, answer your questions, and help you understand what's possible. No pressure, no high-pressure sales tactics.
4.9 stars on Google • 101 Google reviews • MHIC #91686 • Locally owned and operated
Service Area
Sunroom Builders Serving Harford, Baltimore, Cecil, Anne Arundel & Howard County
We are local sunroom builders based in Fallston, Maryland. As an authorized Sunspace dealer with MHIC #91686 and 30+ years of outdoor living experience, we design and install sunrooms across Harford, Baltimore, Cecil, Anne Arundel, and Howard County, including Bel Air, Forest Hill, Fallston, Aberdeen, Havre de Grace, Joppa, Jarrettsville, Edgewood, Towson, Cockeysville, Perry Hall, White Marsh, Elkton, North East, and Chesapeake City. If your town is not listed, reach out and we will let you know if we cover your area.