La deducción por adquisición de vivienda habitual está ligada a la titularidad del pleno dominio, aunque sea compartido, del inmueble.
Por tanto únicamente serán deducibles las cantidades satisfechas en la parte que corresponda a la titularidad del contribuyente. En este caso el 50%.
I had a really urgent problem in the middle of the summer that I needed to get fixed. I tried contacting a bunch of agencies but they were either unavailable, slow, had terrible service or were crazy expensive (one company quoted me 1000€!). Josep replied to me within 10 minutes and managed to submit my forms on the deadline and all for a great price. He saved my life - 100% recommend!