Carpentry and Joinery

Explore carpentry and joinery in plain English, with practical context, common distinctions and questions to ask before work starts.

Start with the entries below. They are part of a growing reference library, not an exhaustive technical specification or a substitute for specialist assessment.

Bespoke joinery

Bespoke joinery is timber or related fitted work made to a particular design rather than selected only from a standard product range. It can include cabinetry, windows, doors and other components. Made to measure describes customisation, not automatic structural, fire or weather performance.

C16 timber

C16 is a structural timber strength class, not a timber species, visual finish or universal span rating. A structural member's suitability depends on grade together with dimensions, spacing, supports, loads and service conditions. The marking does not authorise arbitrary alterations or prove that any C16 piece fits every design.

C24 timber

C24 is a strength class for structural softwood under BS EN 338. It groups timber by specified structural properties; it is not a species, a visual finish or a guarantee of durability outdoors. A C24 stamp does not by itself tell you that a piece is suitable for a particular joist, lintel or deck.

Door hanging

Door hanging is fitting a suitable door leaf and associated hardware into an appropriate frame or opening so the assembly works as intended. The job can involve measurement, adjustment, hinges, latches and finishing. Ordinary internal, external and fire-resisting doors need different specifications and cannot be treated as interchangeable carpentry tasks.

Fire door

A fire door is a door assembly designed to provide specified fire performance when correctly selected, installed and maintained. The leaf is only one part: frame, hardware, seals, glazing, gaps and installation conditions may all matter. A fire label or a heavy feel does not establish that the complete opening performs as required.

First fix

First fix is the stage when concealed or structural components are installed before finishes cover them. Its exact scope varies by trade and contract.

Floor joist

A floor joist is a structural member supporting part of a floor assembly and transferring loads to its supports. Solid timber, engineered timber and other systems have different properties and details. A joist is not adequately specified by its visible depth or a span copied from another room.

Getting into carpentry

Carpentry is skilled measurement, preparation and fitting of timber and related products, commonly on building sites and in occupied homes. First-fix structures, second-fix interiors and specialist repair can need different experience. Choose a route aligned with the work rather than treating every woodworking course as equivalent.

Getting into garage-door installation

Garage-door installation combines surveying, mechanical fitting and, for powered equipment, safety-related controls. A manual replacement and a newly automated assembly can involve different responsibilities. Training should cover the complete installed product and safe handover, not simply how to attach an opener and pair a remote control.

Getting into joinery

Joinery commonly means accurate manufacture and fitting of timber components such as doors, windows, stairs and interiors. It overlaps with carpentry, but workshop production can have different machinery, tolerances and processes from general site work. Choose training and a placement reflecting the intended products rather than relying on a broad woodworking label.

Glulam

Glulam, or glued laminated timber, is an engineered structural product manufactured by bonding timber laminations into a specified member. It can produce large or shaped components, but it is not simply several ordinary boards glued together on site. Product classification, manufacturing control, design and connections all matter.

MDF

MDF, or medium-density fibreboard, is a wood-based panel made from fibres bonded into a manufactured board. It is used for suitable interior components and finishes, with different grades for different conditions. The name alone does not establish structural capability, moisture suitability, emission characteristics or a ready-to-paint finish.

Noggins

Noggins are transverse members or supports within a framed construction, commonly between studs or joists. Their purpose can include support, restraint or provision for a fitting, depending on the design. The term does not mean that an arbitrary extra timber makes any load safe or improves every framing system.

OSB

OSB, or oriented strand board, is a manufactured wood-based panel with strands arranged in layers. Suitable grades are used in specified structural applications such as decking and sheathing. The letters OSB do not establish that every sheet is appropriate for a wet roof, floor span or external exposure.

Plywood

Plywood is a wood-based panel formed from bonded veneers. Suitable products can serve structural, decorative or other purposes, but not every sheet has the same properties. Species, construction, bond, grade, exposure and intended use matter; the label exterior does not automatically mean an unfinished panel can remain permanently wet.

Second fix

Second fix is the stage when visible fittings and finishing components are installed after much of the concealed work and wet finishing. The precise boundary depends on the trade.

Stud wall

A stud wall is a framed wall with vertical members supporting sheet linings and any insulation. Studs may be timber or metal, and the wall may have structural, acoustic or fire performance requirements.

Last editorial check: 8 November 2026.