In Nigerian, public building projects (PBPs) failure and abandonment constitutes one of the hindrances to the development of the nation’s economic system. Therefore, the links between PBPs management success and the built environment professionals (BEPs) is becoming an important field of attention. This study evaluates the application of project planning techniques in PBPs in Nigeria and project planning challenges related to their successful delivery. Review of relevant literature combined with experts’ input revealed twenty three factors; this form the basis for designing a questionnaire adopted to collect relevant data from BEPs. Findings identified poor strategic project planning aligned to project success, unrealistic expectation and overly bureaucratic hiccups from project initiators as the most critical factors influencing project management practices (PMP) affecting success in PBP delivery. The study suggests that unsuccessful project delivery is a reflection of inappropriately applied project planning techniques leading to serious project planning challenges.

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Today, Christianity in Nigeria has increased in churches in large cities to the point where Nigeria now has the highest number of churches per capita globally. As good as that is, the concern of this paper was whether building professionals consider indoor environmental indices performance about worshippers' comfort and well-being. This paper aimed to compare the indoor environmental performance of church buildings to develop design guidelines for improved environmental indices performance of churches in North-East Nigeria. Ten church buildings were purposefully chosen, and the effects of temperature, CO, CO2, RH, PMs, HCHO, TVOCs, Radon, Sound, Ventilation, Moisture, Dewpoint, and Lighting were investigated using a questionnaire, observation, and indoor environmental detectors. A case study evaluation was used to evaluate this pragmatic approach. The paper found that seven out of fourteen parameters had low performance on church members in North-East Nigeria. The paper recommends that information about the danger of these indices be made public. Creating a design guideline to improve worshippers' comfort and well-being became necessary.

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