In this contribution, aiming to scale-up the production of the material to be used as a magnetic refrigerant, important results are reported regarding the preparation of La(Fe, Si) <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$_{13}$</tex> </formula> compounds by a novel powder metallurgical approach. Additionally, with this new processing route, near net shape components can be fabricated. Based on the ability of some rare-earth compounds to absorb and desorb hydrogen in a controllable manner, an La-based alloy, obtained by conventional casting, was used as a precursor material for this approach. Due to the high content of La-rich phase (LaFeSi), it was possible to decrepitate the ingot into small pieces via interstitial hydrogen insertion. The decrepitated material was further milled, sieved and subsequently pressed into cylinders. A further consolidation step was carried out by sintering. During sintering, simultaneously, the microstructure was homogenized and the porosity controlled. After a 6 h heat-treatment at 1423 K, the samples approached single-phase La(Fe, Si) <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$_{13}$</tex></formula> , with a relative phase amount of 99 wt%. The residual porosity, inherent of powder metallurgy, plays an important role in a final hydrogenation step necessary to tune the transition temperature. This transition-temperature, around which the magnetocaloric effect is useful for refrigeration, was verified via DSC, while direct measurements of the adiabatic temperature change, <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\Delta T_{\rm ad}$</tex></formula> , were carried out to quantify the magnetocaloric effect.