However, concerns remain about whether the industry can sustain the performance once the UK leaves the EU.
Figures released by the Society of Motor Manufacturers (SMMT) show demand grew 5.2% year-on-year last month.
In total, 127,952 cars were built in British factories following a double-digit decline in the same month last year when Easter bank holiday timing impacted output.
Growth was also buoyed by production ramp up at several plants to deliver a number of key new and updated models.
Manufacturing for home and overseas markets grew by 7.3% and 4.7% respectively, with 103,662 cars built for export in the month - accounting for 81% of the total production volume.
However, the SMMT said year-to-date, overall output remained 3.9% down, with a total of 568,378 cars rolling off production lines in the first four months. Of these, 80% were destined for export, as domestic demand fell 10.3% against a less substantial 2.2% decline in vehicles destined for global markets.
Mike Hawes, SMMT Chief Executive, said: While Aprils growth isnt altogether surprising given the significant decline in output this time last year, it is good to see earlier planned investment into new models delivering results.
However, given such investment was made on the basis of the free and frictionless trade afforded by our EU membership, the ability of UK plants to attract the next wave of new models and drive future growth depends upon maintaining these competitive conditions after Brexit. Thats why it is critical that government acts to safeguard our participation in the EU customs union and single market.