Hi, I have the same issue. I have been reading around and it seems that URA's circular seems to suggest that RT are firstly exempted from GFA, and they will approve if it's not covered on the sides. But we also need approval from building management, BCA, strange thing is BCA website says trellis is exempted, no approval needed. Hmmm.... Any comments? Under the latest revised guidelines, the covering of outdoor spaces such as PES and private RT will be exempted from computation as GFA. For covering structures over PES and private RT which extend beyond 2m of the external wall of the unit, planning permission from URA is required. URA will assess all proposals on the basis of prevailing development control guidelines to ensure that such structures are not excessively large and are in compliance with the building setback and/or height controls. The covered spaces shall retain a semi-outdoor character. GFA exemption will not apply if the covered area is enclosed at the sides. Applications to URA for planning permission need not be submitted by Qualified Persons, but home owners should ensure that the erected structure is safe and meets the requirements of other relevant agencies such as the Building and Construction Authority (BCA) and the Fire Safety and Shelter Department (FSSD, SCDF).