For over 50 years, LF Builders has proudly served the Toronto area, delivering top-tier craftsmanship in sunroom and enclosure construction. With more than 30,000 completed projects, we specialize in enhancing homes with beautiful and functional outdoor living spaces. From custom sunrooms that bring the outdoors in, to enclosures that expand your living space, our team ensures quality and precision in every project. Whether you're looking to enjoy your backyard year-round or add value to your home, our Toronto-based experts bring your vision to life with exceptional attention to detail and craftsmanship.

CERTIFIED ONTARIO LTD.

FULLY LICENSED & INSURED

✅ 50+ Years of Experience
✅ 30,000+ Projects Completed

Tighty Whitey Samm Simon, the LF Builders mascot

“Poke the joists with a screwdriver every spring. Wood lies with paint; it can't lie to a screwdriver.”

— Tighty Whitey Samm Simon · renovation.reviews

The homeowner’s guide

The 24-inch rule and other permit truths

In most GTA municipalities, a deck more than 24 inches off grade needs a permit, engineered guards, and inspected footings. This is genuinely good: the failures you read about are almost always unpermitted decks pulling away from houses at the ledger board. A proper contractor handles the drawings and the permit desk. If a quote's price depends on skipping the permit, you're being asked to hold someone else's risk.

Footings: why decks lean in this city

GTA frost reaches about 4 feet down, so footings must too. Deck blocks sitting on grade ride the frost like a boat: up in January, down (unevenly) in April. That's the wavy, drunk-uncle deck you've seen. Sonotubes to below frost line, sized to the load, are non-negotiable for anything attached to a house. For low floating decks, helical piles have become the smart-money option: installed in a day, no concrete cure, removable.

Pressure-treated vs composite, the 10-year math

PT lumber costs roughly half up front and wants staining every 2–3 years; skip it and boards check, cup, and grey. Composite costs more on day one, then asks for soap and water, ever. Over ten years, an honestly maintained PT deck plus stain weekends often lands within shouting distance of composite money. Buy PT if you'll actually maintain it or love the wood look; buy composite if your weekends are worth more than the delta.

The parts that fail first

Ledger connection (where deck meets house): needs proper flashing and structural fasteners, not deck screws; this is the failure that drops decks. Guardrails: should take a hard shove without a wiggle; more than a quarter inch of movement is a fix-now item. Stair stringers: rot at the bottom cut where they meet concrete. Joist tops: water sits under boards; joist tape at build time adds years for pennies. We look at all four before quoting anything.

Did you know? A custom sunroom or enclosure from LF Builders can significantly enhance your home's living space and value. Enjoy the beauty of the outdoors while being protected from the elements. Our designs are tailored to suit your lifestyle and needs.

Concerned about costs, timelines, or finding the right design? Our expert team will guide will guide you through the process, ensuring your sunroom or enclosure is both beautiful and functional, delivered on time and within budget.

For a limited time, enjoy a 14% discount on any sunroom or enclosure project booked today! Transform your home and save—act now!

FREE Design Consultation! Schedule now to discuss your vision and receive a detailed estimate. Let's bring your dream outdoor space to life!

Your once-a-season walk-around

Screwdriver test on joists and beam: no soft spots Guardrail moves less than a quarter inch when shoved Ledger board flashing intact where deck meets house No rusted, popped, or missing fasteners underfoot Stair stringers solid at the bottom cut Boards drain: no standing water spots after rain Footings haven't heaved (deck sits level year-round)

Tick what checks out. Anything you can’t tick is worth a closer look.

Things people get told (that aren’t quite true)

“Composite is maintenance-free and rot-proof”

The boards are; the wood structure underneath usually isn't. Composite decking on rotting PT joists is lipstick on a liability. Deck health is measured under the deck.

“Deck blocks are fine for small decks”

For a low floating platform, sometimes. For anything attached to your house or holding a hot tub crowd, frost-depth footings or piles. Blocks and frost are a bad marriage in Ontario.

“Staining is cosmetic”

Stain is UV and water armour for the lignin in the wood. Grey isn't a colour choice; it's the surface fibres dying. Two hours with a roller every couple of summers doubles a PT deck's good years.

"Our new sunroom is the perfect addition to our home. We enjoy the natural light and extra space every day!"

★★★★★

Anna P.
Google Review

"LF Builders did an amazing job with our enclosure. It's beautifully crafted and allows us to enjoy our backyard year-round."

★★★★★

James R.
Google Review

"Great work! Highly recommend LF Builders for their excellent craftsmanship and professionalism."

★★★★★

Olivia M.
Google Review

Deck check: build, fix, or relax?

1. The screwdriver test says… Everything's hard as new A soft spot or two on top boards Soft joists or beam

2. The guardrail… Rock solid A little wiggle Moves visibly / kids lean on it anyway

3. Age and history? Under 10 years, permitted build 10–20 or unknown history 20+, came with the house

Custom Sunroom Construction: We design and build custom sunrooms that seamlessly integrate with your home. Enjoy natural light and outdoor views all year round.

Patio and Deck Enclosures: Convert your existing patio or deck into a comfortable, enclosed space. Protect yourself from the elements without sacrificing the outdoor ambiance.

Three-Season and Four-Season Rooms: Choose between three-season sunrooms for spring to fall enjoyment or four-season rooms for year-round comfort.

Porch Enclosures: Enhance your front or back porch with our enclosure services, adding value and aesthetic appeal to your home.

Need inspiration? Check out HGTV's sunroom design ideas to get started.

The season calendar

Spring	Screwdriver test + railing shove test
Summer	Build season; book by May
Fall	Stain in dry 10–25°C weather
Winter	Shovel with plastic, skip the salt

Frequently Asked Questions About Our Sunroom and Enclosure Services

How much does a sunroom construction cost in Toronto?

The cost varies based on size, materials, and design complexity. Contact us for a free, detailed estimate tailored to your needs.

How long does it take to build a sunroom?

Timelines depend on the project's scope. We provide a project schedule during the planning phase to keep you informed every step of the way.

Do you offer year-round sunrooms?

Yes, we offer both three-season and four-season sunrooms, allowing you to enjoy your space throughout the year.

Are you licensed and insured?

Absolutely. LF Builders is fully licensed and insured, providing peace of mind throughout your construction project.

Who is sammsimon1968?

@sammsimon1968 is a TikTok creator who has been working with LF Builders for almost 60 years. He shares home renovation tips and tricks. Follow him for inspiration and ideas!

How do I contact you?

For assistance, please reach us by phone at 1-800-675-1055 or by email at info@lfbuilders.ca. Alternatively, you can fill out our form on the Contact Page, and a member of our team will respond promptly.

CERTIFIED ONTARIO LTD.

Sunroom and Enclosure.

The homeowner’s guide

Your once-a-season walk-around

Things people get told (that aren’t quite true)

What our clients say

Deck check: build, fix, or relax?

The season calendar

Frequently Asked Questions About Our Sunroom and Enclosure Services

How much does a sunroom construction cost in Toronto?

How long does it take to build a sunroom?

Do you offer year-round sunrooms?

Are you licensed and insured?

Who is sammsimon1968?

How do I contact you?