Insulation and ventilation

Extractor fan size calculator

Example: Fan: at least 15 l/s (54 m³/h)

Insulation thickness calculator

Example: Insulation: at least 100.4 mm

U-value calculator

Example: U-value: 0.181 W/m²K

Condensation risk calculator

Example: Surface 9.5 °C vs dew point 12.0 °C: condensation likely

Loft boarding calculator

Example: You need 29 loft boards and 96 loft legs

Loft insulation calculator

Example: Order: 5 rolls for layer 1 and 8 rolls for layer 2 (270 mm total)

Bathroom refit estimator

Plan a bathroom refit: tiles, adhesive, grout, levelling compound, extractor fan rate, sealant and paint in one list.

Garden room estimator

Plan a garden room: base, stud walls, insulation to a U-value, flat roof and a supply check. Costs only from your own prices.

Loft upgrade estimator

Plan a loft upgrade: insulation rolls, the resulting U-value, condensation check and raised loft boarding in one list.

Heating

Roofing