Introduction: The Great Roofing Debate
When planning a car porch, patio or outdoor shelter in Singapore, one question comes up again and again: should I install a trellis roof or a solid roof? Both have passionate advocates, and the right answer depends on your priorities.
In this article, we compare trellis roofing and solid roofing across the factors that matter most in Singapore: rain protection, heat, airflow, aesthetics, cost, maintenance and approvals.
What Is a Trellis Roof?
A trellis roof is an open-grid structure, usually made from aluminium, steel or timber. The beams are spaced apart, allowing air and light to pass through. It provides partial shade without fully enclosing the space.
Trellis roofs are commonly used over car porches, walkways, gardens and patios. They can be left open or fitted with polycarbonate panels for rain protection.
What Is a Solid Roof?
A solid roof uses continuous sheets or panels — polycarbonate, aluminium, glass or tiles — to create a complete barrier against rain and sun. It offers full protection but restricts airflow and natural light depending on the material.
1. Rain Protection
Trellis Roof
An open trellis roof provides little to no rain protection. You will still get wet during a downpour. However, trellis roofs can be fitted with polycarbonate or glass infill panels to block rain while keeping the trellis look.
Solid Roof
A solid roof gives complete rain protection. If your priority is keeping your car, furniture or outdoor cooking area dry, a solid roof is the clear winner.
Winner: Solid roof (unless trellis is fitted with infill panels).
2. Heat and Airflow
Trellis Roof
Trellis roofs excel at airflow. Hot air rises and escapes through the open grid, so the area underneath stays cooler. They also cast dappled shade rather than blocking light completely.
Solid Roof
Solid roofs trap heat. Without proper ventilation or insulation, the space underneath can become uncomfortable. Polycarbonate and glass can also create a greenhouse effect if not specified with heat-reflective properties.
Winner: Trellis roof.
3. Aesthetics
Trellis Roof
Trellis roofs add architectural interest. They look modern, resort-like and less bulky than solid roofs. Timber trellis adds warmth, while aluminium trellis offers a sleek, industrial look.
Solid Roof
Solid roofs are more utilitarian. They can look clean and modern, especially in aluminium or glass, but they lack the decorative appeal of a trellis.
Winner: Depends on taste, but trellis often wins for character.
4. Cost
Trellis Roof
Trellis roofs are generally cheaper because they use less material. A basic aluminium trellis for a car porch might cost $3,000–$6,000, depending on size.
Solid Roof
Solid roofs cost more. Polycarbonate or aluminium solid roofs start around $5,000–$10,000 for a car porch. Glass and retractable systems cost significantly more.
Winner: Trellis roof.
5. Maintenance
Trellis Roof
Trellis roofs need occasional cleaning, especially if plants grow on them. Aluminium trellis is low-maintenance; timber trellis needs periodic oiling or staining.
Solid Roof
Solid roofs also need cleaning, and polycarbonate sheets may need replacement after 10–15 years. Glass roofs show dirt and water spots easily.
Winner: Tie — both need some upkeep.
6. Approvals
Both trellis and solid roofs may require approval from your town council, MCST or URA, depending on your property type. Covered areas are regulated, and adding a roof can affect your gross floor area (GFA) for landed properties.
Always check with the relevant authorities before installing. A reputable contractor will advise you on what is typically required.
7. Resale Value
A well-designed trellis or solid roof can increase your property's appeal. Buyers appreciate usable outdoor space, especially in Singapore where land is scarce.
Solid roofs offer more functional space, while trellis roofs offer aesthetic value. Both can be selling points.
Which Should You Choose?
Choose a Trellis Roof If:
- You want shade without blocking airflow
- You prefer a decorative, resort-style look
- You are on a tighter budget
- You don't need full rain protection
Choose a Solid Roof If:
- You need complete rain protection
- You want to use the space in all weather
- You are covering a car or expensive outdoor equipment
- You prefer a clean, modern appearance
Hybrid Option: Trellis with Polycarbonate Infill
Can't decide? A trellis roof with polycarbonate infill panels gives you the best of both worlds. You get the trellis aesthetic, airflow through the open sections, and rain protection where it matters. This is a popular choice for car porches in Singapore.
Final Thoughts
There is no universally correct answer. Trellis roofs win on airflow, cost and aesthetics. Solid roofs win on rain protection and all-weather usability. Think about how you will use the space, your budget, and your maintenance appetite.
BH Supply Pte Ltd designs and installs both trellis and solid roofing systems across Singapore. We offer free site surveys and honest advice. Call or WhatsApp 8588 9230 to discuss your project.
