Three new housing areas were announced in HDB Press Release in 2013: Bidadari Estate (within Toa Payoh planning area), Tampines North and Punggol Matilda. The planning work for Bidadari started in 2012 and got first BTO launches in 2015. Other areas with massive construction (not officially announced) were Bukit Batok (west end), Choa Chu Kang (south end), Yishun (east side), Sembawang (south area towards Yishun).
Timothy wrote in 2011 on Wikipedia that after the current New Towns will be saturated, HDB will start building flats in Tengah, Simpang, Bukit Brown, Bidadari and Seletar… looks like a personal guess rather than official info.
Tengah, the 24th New Town, was officially announced in 2016 and first BTO was launched in Nov 2018.
HDB prices stabilized between 2015 and 2020. When COVID-19 pandemic started, I was expecting prices dropping like during 2003 SARS, but contrary happened: internet connection available nowadays allowed people to work from home, and despite that pandemic caused a short-term global recession, it changed people lifestyle towards investing more in (bigger) homes, further accelerating prices growth, especially for outer towns.
2010s flats
SkyVille & SkyTerrace @ Dawson, two iconic BTO projects broke record of most expensive HDB flats, due to prime location near Queenstown MRT, and were still oversubscribed (9865 applications for all 1718 units, up to 12 applicants for each 5-rm unit, but in case of 3-rm units were slightly less applicants than units). Flats are even smaller than in Pinnacle@Duxton, to 83 sqm for 4-rm and 101 sqm for 5-rm. SkyTerrace feature lofts and paired units (similar with dual-key units in condos), caused waste of space in already too small apartments.
Other BTO projects of 2010s decade remained at the standard sizes 45 / 65 / 90 / 110 sqm (internal floor area, in resale transactions they will appear 2-6 sqm bigger due to A/C ledge and balcony). Supply of 5-room was increased, average flat size rose from 80 sqm for BTO flats launched in 2009 to 85 sqm in 2012, then dropped to 75 sqm in 2014 due to increased supply of 2-room flats once singles over 35 were allowed to purchase new HDB 2-room flats.
Meantime, private developers downsized apartments, affecting DBSS and EC projects too, for example Trivelis sizes are 60 / 80-82 / 105 sqm. Of the 105 sqm 5-room, only 88 sqm is internal, be shocked at floor plan! If they specify balcony size 12 sqm, living room should be 3×5 m, common bedrooms 3×2.5 m, study 2x2m.
HDB do not reintroduce Executive Apartments, motivating that these flats were purchased by rich families who can afford too much space for no reason, also the average household size dropped thus larger flats are no longer necessary. Instead, HDB introduced 3gen flats in July 2013 BTO and restricted them to a married couple plus another family relative. 3gen flats have 4 bedrooms and 3 bathrooms in 115 sqm (following a trend started by Executive Condominiums that introduced 5-bedroom flats).
2-Room Flexi was announced on 19 August 2015, they replace Studio Apartments and 2-Room, can be purchased both by elderly (15-45 years lease, no resale market) and by families and singles (99 years leases, can be sold on resale market).
aSkyville @ Dawson, smallest 4-Room BTO flat (83 sqm) / new 3gen flat introduced in 2013
