In recent years, layered heterostructures of halide perovskites have emerged as promising optoelectronic systems due to their tunability and to the presence of strong excitonic effects [1], with potential applications for efficient light emission, spintronics, single-photon emission and photonic logic. This last technology is being developped by the H2020 POLLOC (polariton logic) consortium using exciton-polariton devices. From the theoretical point of view, first-principles studies of exciton physics in layered halide pervoskites are possible [2] but severely constrained by system size. To go beyond this limitation, symmetry-based semi-empirical tight-binding models have provided an efficient description of the electronic structure and optical properties of bulk halide perovskites [3-5]. In this talk, we will discuss such models and their extension to the case of layered perovskites, a stepping stone towards a robust description of excitons in these compounds within the tight-binding framework [6,7]. [1] J.-C. Blancon et al., Nature Comm. 9, 2254 (2018) [2] C. Quarti et al., Adv. Optical Mater. 2023, 2202801 [3] S. Boyer-Richard et al., J. Phys. Chem. Lett. 7, 3833 (2016) [4] A. Marronnier et al., ACS Nano 12, 3477 (2018) [5] Z. Wei et al., Nature Comm. 10, 5342 (2019) [6] R. Benchamekh et al., Phys. Rev. B 91, 045118 (2015) [7] Y. Cho et al., Phys. Chem. Lett. 10, 6189 (2019) This work was supported by the M-ERANET grant PHANTASTIC Call 2021.