Even though I'd used a 3.25mm needle the gauge was very similar to the one recommended on the ball band. So the way I knit was influencing the end result. That said the fabric created was great for my toy. I could see a tiny bit of the filling through the garter stitch roof but none through the stocking stitch sections. (Gauge was 22st and 34 rows over 10 cm). House approximately 13 cm wide x 10 cm high.
This was knitted with 3mm needles and turned out slightly smaller than the first (purple) house. (Gauge was 23 stitches and 36 rows). House size approximately 11.5 cm wide x 9 cm high.
The third house was completed with 2.75mm needles, the result being definitely smaller than my first (purple) house. The white house has the tightest fabric and had the best surface for sewing the embroidered flowers on the front. Finished house size 10 cm x 8 cm.