Nowadays legal system of Estonia does not cover essential aspects related to geotechnical engineering explorations for assessing environmental risks to be considered during planning processes and for providing designers with reliable geotechnical parameters for sustainable construction solutions. The absence of appropriate legal regulation does not support the reuse of mined areas and sustainable use of mineral recourses. The article deals with analysis on planning and building sectors with concrete suggestions for changes in legal regulations. Additionally radon level survey and geotechnical inspection related issues have analysed in the frame of risk assessment. Both of the above issues are especially important to be considered in mined areas. The utilisation of previous research data and re-establishment of Geotechnical Fund will enable a much more economical use of the available resources and a better management of possible risks.