Philippine architecture exhibits a variety of forms and styles. Early Filipinos sought refuge in caves, as evidenced by petroglyphs in Angono and the defensive citadels of Savidug in Batanes. The invention of stone tools led to the first architectural revolution, allowing the creation of lean-tos and treehouses, often in areas with tribal conflicts for protection.

Southeast Asian cultures share a common Austronesian ancestry, characterized by waterborne lifestyles. Philippine vernacular architecture strongly reflects this heritage, with a typical house featuring a raised wooden structure, elevated posts, a pitched roof, and decorative gable finials. The prototypical Bahay Kubo is built with wooden posts, while Ifugao houses incorporate circular rat guards, and Maranao Torogans rest on stout log posts. Seaboard houses, like those of the Bajau, are raised on slender stilts. Cross-gable finials are a common feature in Southeast Asian roofs. Dwellings in Batanes are designed to withstand severe storms, sea spray, and earthquakes, incorporating lime processing introduced by Spanish colonists in the 18th century to construct stone and mortar houses known as 'cal y canto'.

In the mountain provinces, vernacular houses were designed to provide warmth and adapt to the mountainous terrain. In contrast, lowland vernacular dwellings, like the Bahay Kubo, were open to light and ventilation. The Bahay Kubo is constructed from various botanic materials, primarily bamboo and thatch, depending on the local ecology.

Spanish attempts to colonize Mindanao were thwarted by the unified Muslim communities, whose religion led to the development of unique architectural styles, particularly the mosque. The oldest standing mosque in the Philippines, found in Tubig Indangan, Simaonul Island, Tawi-Tawi, features a multi-layered, pagoda-style roof. Later mosques, like the Golden Mosque in Quiapo, Manila, approximate Middle Eastern designs, incorporating gilded domes and stylized Maranao Okir patterns.

The geographic features of Sulu and Mindanao fostered both terrestrial and naval architecture, exemplified by vessels like the Sama, Tausug, Yakan, and Bajau boats. Houses in Muslim societies of the southern Philippines are categorized into three types: land-based stilted dwellings along the shoreline, oceanic stilt dwellings built entirely over the sea, and houseboats that serve as both home and fishing vessel.

Vernacular architecture encompasses indigenous, folk, tribal, ethnic, and traditional building styles found among various ethno-linguistic societies in the Philippines. This architectural tradition remains an omnipresent practice and an accessible idiom for the majority of Filipinos.