Short answer: budget ₱1,200–₱2,600 per square metre of roof area for a complete metal roof supplied and installed in 2026 — sheets, purlins, trusses, fasteners, flashing, gutters and labour. But the number that trips people up isn't the rate, it's the area: your roof is 10–30% bigger than your floor plan before you even add the overhang.
You will find ₱1,000/m² and ₱10,500/m² quoted for "roofing" in the same search. They are measuring different things. The low figures are usually sheets only — no structure, no labour. The very high ones are whole-house construction costs that were never roofing rates at all. A real roof is the assembly, and the steel underneath often costs more than the sheets on top.
This is the single most common costing error, and it is pure geometry. A pitched roof runs along its slope, not along the floor, so it covers more surface than the plan area beneath it. Then it extends past the walls as an eaves overhang.
| Roof pitch | Slope factor | 100 m² floor becomes | Common on |
|---|---|---|---|
| 10° | 1.015 | 102 m² | Low-slope commercial, lean-to |
| 15° | 1.035 | 104 m² | Minimum practical for long span sheet |
| 20° | 1.064 | 106 m² | Common bungalow pitch |
| 25° | 1.103 | 110 m² | Typical PH residential |
| 30° | 1.155 | 116 m² | Steeper residential, tile roofs |
| 35° | 1.221 | 122 m² | Feature roofs, high rainfall |
| 40° | 1.305 | 131 m² | Steep architectural |
Now add the overhang. A 600–900 mm eave all round a 10 × 10 m house adds roughly 25–35 m² of roof. Between pitch and overhang, a 100 m² bungalow routinely needs 135–145 m² of roofing — 35–45% more than the floor area a quote was probably based on.
Converts your floor plan into true roof area through pitch and overhang, prices it by profile and gauge, then shows the wind uplift each purlin connection has to hold — because that, not the sheet, is what usually fails.
All figures are per square metre of roof area, supplied and installed, as AEDO 2026 planning ranges.
| Component | ₱ per m² of roof | Notes |
|---|---|---|
| Corrugated GI, 0.4 mm (ga 26) | 420–540 | Cheapest. Least tolerant of uplift at fasteners. |
| Pre-painted rib-type long span, 0.4 mm | 480–620 | The default residential choice |
| Pre-painted rib-type long span, 0.5 mm | 650–850 | Sensible minimum for typhoon-exposed provinces |
| Concrete / clay roof tile | 900–1,500 | Heavy — 0.55–0.75 kPa. Framing must be sized for it. |
| Insulated sandwich panel | 1,400–2,200 | Thermal and acoustic benefit; common in commercial |
| Timber trusses + steel purlins | 380–620 | Cheaper up front; termite and moisture exposure |
| Light steel trusses + C-purlins | 480–780 | Most common for residential today |
| Fabricated steel trusses, wide span | 850–1,450 | Warehouses, commercial, long clear spans |
| Flashing, ridge, gutters, fasteners | 120–260 | Routinely omitted from cheap quotes |
| Installation labour | 250–450 | Confirm whether quoted on roof area or plan area |
The pattern worth noticing: the structure underneath usually costs as much as or more than the sheets on top. Owners think of a roof as the visible covering and get surprised when the trusses and purlins turn out to be the bigger line. That is also why "roofing" quotes vary so wildly — some include the frame and some do not. Our quote checker covers how to force that out into the open.
A light metal roof weighs about 0.05–0.10 kPa. Wind suction in a 250 kph zone runs an order of magnitude higher. Your roof stays on because it is tied down, not because it is heavy — and a chain fails at its weakest link, not its average.
Why Roofs Peel From a Corner
Wind does not press evenly on a roof. It separates at edges and corners, and the suction there is commonly two to three times the value in the middle of the roof — which is exactly where the fasteners are usually spaced the same as everywhere else.
Once one sheet lifts at a corner, the wind gets underneath and the roof unzips. Closer fastener spacing in edge and corner zones is one of the cheapest resilience measures in Philippine construction, and one of the most consistently skipped. Our typhoon-resistant construction checklist covers the rest of the envelope.
Cost bands are AEDO 2026 planning ranges for supply and install, consistent with our house and warehouse cost guides. They are market estimates for judgement, not quotations, and they move with delivery distance, roof complexity, span and site access. Roof covering weights are the NSCP values from our dead and live loads reference. The uplift figures are screening estimates from the NSCP Section 207 velocity pressure with an indicative coefficient — a real design uses exposure category, topographic factor and zone-by-zone pressure coefficients, and edge and corner zones are substantially worse than the field values shown.
How much does roofing cost per square metre in the Philippines in 2026?
As a planning range for 2026, a complete roof supplied and installed runs about 1,200 to 2,600 pesos per square metre of roof area for a standard pre-painted metal roof on a steel frame. The low end is thin gauge corrugated sheet on light purlins over short spans; the high end is 0.5 millimetre pre-painted long span on a fabricated steel truss with proper flashing, gutters and tie-downs. Published figures that look far outside this range usually measure something different: quotes near 1,000 pesos are often sheets only with no structure or labour, while figures around 10,000 pesos per square metre are whole-house construction costs, not roofing.
Is roof area the same as floor area?
No, and this is the most common costing error. A pitched roof is longer along its slope than the floor beneath it, and it also extends past the walls as an overhang. At a 25 degree pitch the sloping area is about 10 percent larger than the plan area it covers, at 30 degrees about 16 percent, and at 40 degrees about 30 percent. Add a typical 600 to 900 millimetre eaves overhang all round and a 100 square metre bungalow can easily need 135 to 145 square metres of roofing. Pricing a roof off floor area understates it every time.
What gauge of roofing sheet should I use in the Philippines?
For a permanent house in a typhoon-exposed province, 0.5 millimetre nominal thickness, commonly sold as gauge 24, is the sensible minimum for the main roof, with 0.4 millimetre or gauge 26 acceptable for sheltered areas, carports and light structures. Thinner sheets are widely sold and are cheaper per square metre, but sheet thickness affects how well the roofing resists the local crushing and tearing that happens at fasteners under wind uplift. In practice the failure is rarely the sheet itself splitting; it is the sheet pulling over the head of the screw.
Why do roofs blow off in typhoons if the sheets are screwed down?
Because a roof does not fail as one thing, it fails at the weakest link in a chain, and that chain has four links: sheet to purlin, purlin to truss, truss to beam or wall, and the wall or beam to the foundation. Wind uplift pulls the whole assembly upward, and a light metal roof weighs almost nothing, roughly 0.10 kilopascals, so its own weight resists almost none of the suction. Most Philippine roof losses trace to the second and third links rather than the first, because the screws into the sheet are visible and get attention while the purlin and truss connections are hidden and often just tack welded or nailed.
How much of a roof budget is materials versus labour?
For a typical Philippine metal roof, expect roughly 60 to 70 percent materials and 30 to 40 percent labour, where materials means the sheets, purlins, trusses, fasteners, flashing and gutters together. The steel structure underneath is usually the single largest line, often larger than the roofing sheets themselves, which surprises owners who think of a roof as the visible covering. Labour is quoted either per square metre of roof area or as a lump sum for the whole roof, and the two are worth comparing because a per square metre labour rate applied to plan area rather than roof area understates the cost.
Do I need an engineer to design a house roof?
For a building permit you need structural plans signed and sealed by a PRC-licensed civil engineer, and the roof framing forms part of those plans. Beyond the permit requirement, roof framing is one of the few parts of a small house where the wind case genuinely governs the design rather than gravity, and where getting the connection detail wrong has consequences the owner sees in the first strong typhoon. Standard truss profiles copied from another project are common and are also the reason many roofs fail at spans or exposures they were never sized for.
Roof framing is where the wind case actually governs. We size trusses, purlins and — the part that matters — the connections, for your province's design wind speed and your building's geometry.