Frequently Asked Questions

General Enquiries

• 1. My project is not eligible for SGIS. Is it still possible for us to seek your advice?

  Yes, we provide free consultancy services regarding the Skyrise Greenery systems available in the market and suitable plant selection. We also provide advice on certain issues in pre- and post-installation matters based on experiences gathered from other completed projects of similar nature.

• 2. If plants are exposed to a prolonged period of drought, will they grow back subsequently?

  It depends on your choice of plants, hardy and drought-tolerant plant species are more likely to survive prolonged periods of drought.

• 3. What is the average weight of a green roof system?

  The average weight of green roof system ranges from 50-150 kg/m2. It is advisable to consult a certified Professional Engineer on the load bearing capacity of the roof structure, regardless of whether you are working with a new or existing building.

• 4. Is an irrigation system required?

  An irrigation system is generally required for most green wall systems and intensive roof gardens to ensure the healthy growth of plants.

  Extensive green roofs may be designed to be self-sustaining without irrigation through the use of integrated water reservoirs in the drainage layer and the selection of drought tolerant plants. However, green roofs with integrated irrigation are not uncommon. If you are considering installing irrigation for your skyrise greenery, sub-surface drip-irrigation system is the preferred choice as it optimizes the use of water by directly dampening the substrate.

• 5. What is the lifespan of green roof?

  The lifespan of a green roof is about 20 years. It can last longer when well maintained. The conventional exposed roofs need maintenance every five to ten years.

• 6. Will a green roof affect my waterproofing?

  Correct installation of a green roof will not have any adverse effect on the waterproofing. The additional layers of a green roof can protect the roofing membrane from UV rays, extreme temperature fluctuations and puncture. The reduced stress can double the serviceable life of the waterproofing.

• 7. Is rooftop greenery expensive to maintain?

  Maintenance costs will vary depending on the nature, scale and design of the project. You can work with your contractor to design a solution to fit within your budget. To minimise cost, consider a sustainable green roof where plants are allowed to flourish together as nature intends. Such naturalistic landscape design requires less maintenance and is a great choice to achieve biodiversity, and an environmentally friendly rooftop greenery.

• 8. Who are the contractors I can engage to implement my skyrise greenery?

  For a full list of companies on the Landscape Company Register, please refer to this website Do note that these companies are not representative of NParks’ endorsement, recommendation nor guarantee on the quality of product or service offered by the contractors.

• 9. How can I showcase my projects on your website?

  Please let us know by clicking here to fill up a query form.

Enquiries about the Skyrise Greenery Incentive Scheme

• 1. How do I apply for the Skyrise Greenery Incentive Scheme?

  Thank you for your interest, please head over to our How to Apply page to learn more! Once you are ready, please fill up the query form and we will get back to you.

• 2. Will maintenance costs be funded under SGIS?

  No, maintenance costs will not be fundable.

• 3. Is the scheme applicable for indoor vertical greenery?

  No, please feel free to clarify with us by filling up the query form here.

• 4. Why is it necessary to have the five year undertaking period?

  SGIS aims to promote the implementation of sustainably designed and well-maintained rooftop and vertical greenery that can contribute towards Singapore’s climate, ecological and social resilience. The five years undertaking period is to ensure the sustainability of the project.

• 5. Is my building eligible for the Skyrise Greenery Incentive Scheme?

  Existing buildings that are occupied at the time of application or undergoing Additions & Alterations (A&A) works may be eligible for SGIS. Please refer to this page for more details on eligibility.

• 6. How much is the incentive payout amount

  The cash incentive covers up to 50% of the Skyrise Greenery installation costs or a maximum of $200 per metre square for rooftop greenery and a maximum of $500 per metre square for vertical greenery, whichever is lower.

• 7. Is it necessary to wait for NParks’ approval before proceeding with the installation?

  Yes, your proposed skyrise greenery project will be assessed for SGIS based on the project’s merits. NParks will provide the necessary advice on your proposal if required. Upon approval of your application, you will receive a letter of offer from NParks, following which, installation works may begin.