Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
श्रियं लक्षणहीनास्तु न प्रतिष्ठासमो रिपुः ।गुणाधिकतरे लग्ने दोषः स्वल्पतरो यदि ॥ ५३८ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 538.
One done without the right marks can harm prosperity. No enemy is like a faulty installation. Say the lagna (rising sign) has far more good points, and its fault is very small.
Simple meaning: A faulty installation is the worst enemy. Pick a rising sign with many good points and little fault.
सुराणां स्थापनं तत्र कर्तुरिष्टार्थसिद्धिदम् ।
Then installing gods brings the doer what he wants. Next come rules for building temples and houses.
क्षेत्रमादौ परीक्षेत गंधवर्णरसांशकैः ।
Test a plot first by the smell, colour and taste of its soil.
सितं रक्तं च हरितं कृष्णवर्णं यथाक्रमम् ।
The soil colours are white, red, green and black. The tastes are sweet, pungent, bitter and astringent.