Here is a comprehensive list of the laws, policies, and executive orders on philippine heritage and culture, architecture, and construction that might be useful for you.
Building Laws
PD 1096: National Building Code of the Philippines (NBCP)
PD 1185: Fire Code of the Philippines
PD 957: Housing and Land Use Regulatory Board (HLURB)
Construction Laws
2016 Revised IRR of Republic Act No. 9184
IRR of RA 4566 for Registration and Classification of Contractors
IRR of RA 4566 for Licensing of Constructors
CIAP Implementing Rules and Regulations of PD 1746
Executive Order No. 133, s. 1987
Executive Order No. 768, s. 1982
Climate Policies and Executive Orders
Philippine Green Building Code (P.D. 1096)
Moratorium on endorsements for greenfield coal power plants
Sustainable Finance Policy Framework of 2020
Enhanced National Greening Program (Executive Order 26 of 2011 and Executive Order 193 of 2015)
Philippine National Climate Risk Management Framework of 2019
National Security Policy 2017-2022 and National Security Strategy
Philippine Development Plan 2017-2022
Philippine Energy Plan 2018-2040
Master Plan For Climate Resilient Forestry Development
Cultural heritage and cultural centers Policies in the Philippines
Republic Act 10066 of the Philippines
Presidential Decree n°374 amending certain sections of Republic Act n°4846