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Keith Teo

Founder and author, CheckHowMuch

Hi, I'm Keith. I live in an HDB flat in Singapore and I built CheckHowMuch because I got tired of property portals locking public data behind lead capture forms. I write all the analysis on this site myself, focused on what the data actually shows.

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Keith Teo, founder and author of CheckHowMuch.sg
01

Background

I grew up in Singapore and have lived in HDB my whole life. The first time I tried to look up what my own block had sold for, I had to enter my phone number on three different portals to get a partial answer. None of them showed me lease decay properly. None of them let me see the full history. The data was public. The access wasn't.

So I built CheckHowMuch. It runs a monthly pipeline against data.gov.sg, generates a page for every block, and shows real comparable sales plus the actual maths behind valuations. No login. No flyers.

Outside of CheckHowMuch I run keithteo.ai, where I teach builders and operators to use AI tools to ship faster. The two worlds connect: I use the same tools to build the analysis here that I teach in workshops.

02

What I Write About

HDB resale market analysisSingapore property valuationLease decay and Bala's TableOpen data interpretationProgrammatic SEO and data sitesAI prototyping and applied LLMs
03

Articles by Keith

All insights on CheckHowMuch are written and analysed by me. Each piece is built from the live transaction dataset and the methodology is published openly.

1 in 32 HDB Blocks Hit All-Time Price Records in Q1 2026

Three-month deep dive on which blocks set all-time highs and why heartland towns led the records, not central Singapore.

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How Much Does Your HDB Lose in Value Each Year?

Lease decay math from Bala's Table, applied to every flat type and remaining lease band so owners can model the real cost of holding.

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Singapore HDB Towns That Have Never Recorded a $1M Sale

Which towns are still under the million-dollar threshold, how close each one is to crossing it, and what their ceilings look like.

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Heartland HDB Blocks Crossing $1 Million in 2026

Every Woodlands, Punggol, Yishun and other heartland block that has crossed the million-dollar line this year, mapped block by block.

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520 HDB Blocks Have Hit $1 Million

A full audit of every HDB block that has touched seven figures, including the record breakers and the unexpected Woodlands surprise.

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04

How I Approach the Data

i
Comparable sales for current value. The same approach professional HDB valuers use. Not a fitted curve, not a guess. Real recent transactions in the same block and storey band.
ii
Bala's Table for the future, not the present. Bala's Table is SLA's leasehold relativity model. It belongs in lease decay projections. It does not belong in current-value estimates.
iii
Never extrapolate past known data. If no one has sold a high-floor unit in a block, I will not invent a high-floor price. I show what is known.
iv
Public methodology. The full methodology is on the site. If a number on CheckHowMuch is wrong, the maths is visible so anyone can check.

Working on a story, a thesis, or a piece of research that touches HDB resale data? Drop me a line at keith.tjk@gmail.com or message me on LinkedIn. Attribution is appreciated when CheckHowMuch data appears in writing or media.