This pub is not only a grade II listed building, it is also a One Star pub on the Campaign for Real Ale’s (CAMRA) National Inventory with an interior of special national historic interest, and the description is as follows: "Built circa 1845-50 for Calvert Brewers (Then Hoare & Co and Charrington). Three storey brown stock brick with stucco ground storey and dressings. Frontage on both Princess Road and Gloucester Avenue probably later 19th century.

The main bar area is now a single room with two doors to the street. Bar counter in this room is old, and possibly original, with scrollwork atop the vertical supports, and canted forward. There is fielded panelling to dado level, and surrounding the windows. The counter front and all the panelling has been stripped of paint and varnish. The bar back is mainly modern, but a small three-bay section on the corner angle is old. It has a relatively modern clock in the centre near the top, and any glazing in the bays has been lost to, or is obscured by, chalkboards. The serving counter beneath this section of the bar back is also old.

A second much smaller room is reached via a doorway (no door) on the left, in a single storey adjunct to the main building, and is too narrow to have been a billiards room. It has its own, now unused, door to the street, and its own small bar counter that is not canted except for an end piece by the door separated from the rest of the counter by the staff access hatch. The scrollwork on this counter is slightly different in design to that in the main room so looks like modern work carefully created to match the main bar one. At the back and to the right of this room is a third room behind the servery. This room is very plain and may have been brought into pub use at some stage, but does have a small serving hatch to the servery."

The listing description is as follows: "Includes: The Engineer Public House and attached wall PRINCESS ROAD. Public house. c1845-50. Built for Calverts the brewers. Brown stock brick with stucco ground storey and dressings. Slate roof. Italianate style. EXTERIOR: square composition of 3 storeys on all sides, with strong bracketed cornice and parapet and heavy quoins at angles. Fronts towards Gloucester Avenue and Princess Road with stuccoed facade and windows to bar along ground storey, probably later C19 and incorporating projecting iron light fixtures in the form of dragons left and right of entrances; upper portions with 3 windows with stucco surrounds and keystones on each of 2 storeys, the centre windows at first-floor level having swept sides and pediments. The 2 rear facades less symmetrical, with external chimneybreasts protruding and breaking through parapets. INTERIOR: the bar interiors have lost all fittings of special interest save for their cornices, but the exterior makes for a good example of an early Victorian public house. SUBSIDIARY FEATURES: high stuccoed wall continues along Princess Road in front of yard."

The WhatPub link is here: WhatPub/Engineer

The Pub Heritage Group link is here: PHG/Engineer

The Engineer has yet to feature on a LPG pub tour.