We study the crossover from two to three dimensions in Kondo lattices (KLM) using the Kondo necklace model (KNM). In order to diagonalize the KNM, we use a representation for the localized and conduction electron spins in terms of bond operators and a decoupling for the relevant Green's functions. Both models have a quantum critical point at a finite value of the ratio (J / t) between the Kondo coupling (J) and the hopping (t). In 2 d there is no line of finite temperature antiferromagnetic (AF) transitions while for d ≥ 3 this line is given by, TN ∝ | g |1 / (d - 1) [D. Reyes, M.A. Continentino, Phys. Rev. B 76 (2007) 075114]. The crossover from 2 d to 3 d is investigated by turning on the electronic hopping (t⊥) of conduction electrons between different planes. The phase diagram as a function of temperature T, J / t∥ and ξ = t⊥ / t∥, where t∥ is the hopping within the planes is calculated. © 2007 Elsevier B.V. All rights reserved.