Framing near you

Structural softwood arrives graded, and the grade stamp is the thing to look for rather than the look of the board. Approved Document A, in its 2004 edition with the 2013 amendments, points to the TRADA span tables for solid timber members in floors, ceilings and roofs of dwellings, with BS EN 1995-1-1 and its UK National Annex, PD 6693-1:2012 and BS 8103-3:2009 as the alternative design route. That is the reason a carpenter asks what the span is before quoting a joist size instead of reaching for whatever is on the rack.

Construction products placed on the market in Great Britain carry either a UKCA or a CE mark with a declaration of performance, and GOV.UK guidance confirms that CE marking continues to be recognised for construction products with no end date currently set. For graded timber that declaration is what backs up the strength class printed on the face of the piece.

One British quirk is worth knowing before ordering roof timber. Approved Document A requires softwood used in roof construction, or fixed in the roof space including ceiling joists in the void, to be adequately treated against the house longhorn beetle in a short list of places: the parishes of Sandhurst and Crowthorne in Bracknell Forest, the Borough of Elmbridge, the parishes of Hawley and Yateley in Hart, the District of Runnymede, the Boroughs of Spelthorne, Surrey Heath and Woking, and the former district of Farnborough within Rushmoor. Outside that belt the treatment is a choice; inside it, it is the guidance.

Requirement E2 of Schedule 1 to the Building Regulations 2010 says that dwelling-houses, flats and rooms for residential purposes shall be designed and constructed so that internal walls between a bedroom or a room containing a water closet and other rooms, and internal floors, provide reasonable resistance to sound. Approved Document E, the 2003 edition as amended in 2004, 2010, 2013 and 2015, sets the benchmark in Table 0.2: new internal walls and floors within dwellings should achieve a laboratory value of at least 40 dB Rw for airborne sound insulation.

The limits on application matter as much as the figure. E2 does not apply to an internal wall which contains a door, nor to a wall separating an en suite toilet from its own bedroom, nor to existing walls and floors in a building undergoing a material change of use. Table 0.2 is written for new walls in new dwellings and in conversions, so a partition dropped into an existing house is often outside the requirement altogether. That is a reason to treat 40 dB Rw as the standard to aim at rather than a rule you can point to, and to ask your carpenter what the wall build-up actually is.

In practice the difference between a partition you can hear a conversation through and one you cannot comes down to mass, isolation and sealing: the weight and number of board layers, a mineral wool quilt in the void, and the gaps around sockets, at the head and at the skirting line. A hollow stud wall with a single layer of board each side and a socket back-to-back with the one next door is the version people complain about afterwards.

Approved Document B volume 1, the 2019 edition as amended, treats any concealed space as a cavity, because fire spreading inside one spreads unseen. Cavity barriers are required both to divide cavities and to close their edges, and the document lists where: at the edges of cavities including around openings such as windows, doors and service entry points, and at the junction between a cavity wall and every compartment floor or compartment wall. It also warns that a line of compartment walls must not be completed by putting a cavity barrier above it; the wall itself is extended up to the underside of the floor or roof.

The performance asked of a cavity barrier is 30 minutes' integrity and 15 minutes' insulation, tested from each side separately. Within a stud wall or around an opening, the document accepts steel at least 0.5mm thick, timber at least 38mm thick, polythene-sleeved mineral wool or mineral wool slab under compression, or calcium silicate, cement-based or gypsum-based board at least 12mm thick, while noting that these do not necessarily reach the tested performance on their own. Barriers should be tightly fitted to a rigid construction and mechanically fixed, and where that cannot be done, as where a barrier meets tiles or corrugated sheeting, the junction is fire-stopped instead.

Fire-stopping is a separate discipline from cavity barriers and the document is explicit that the two should not be confused. It is what closes the gaps left where a pipe, cable or duct passes through a fire-resisting wall or floor, and it is the detail most often forgotten when a plumber or electrician follows the carpenter through a partition that was doing a job.

Regulation 3 of the Building Regulations 2010 defines building work to include the erection or extension of a building and a material alteration, and a material alteration is work that would leave the building not complying, or more unsatisfactory, in relation to a defined set of requirements: Part A, paragraphs B1, B3, B4 and B5, Part M and, since October 2024, Part T. That list is why a stud wall in a bedroom is often not building work at all, while a partition that encloses a landing, blocks an escape window, forms an inner room or carries load is.

Where the work does bite, England and Wales use building regulations approval, applied for through a local authority building control team or a registered building control approver. Scotland is a different system: the Building (Scotland) Regulations 2004 work through a building warrant granted before the work and a completion certificate after it, with Schedule 3 listing the work that needs no warrant at all. Northern Ireland works to the Building Regulations (Northern Ireland) 2012, in which structure sits under Part D, fire safety under Part E and sound under Part G, so the letters you will be quoted do not match the English ones.

Two practical consequences follow. First, ask early rather than late: a wall that had to be fire-resisting is far cheaper to build correctly than to open up afterwards. Second, keep whatever certificate the system produces, because it is the document a buyer's solicitor asks for years later.

First fix is priced on complexity rather than on floor area, and the variables are fairly consistent: how many partitions and how tall, whether any of them carry load, whether the floor and ceiling they meet are level and square, how much service work has to be coordinated through them, whether fire resistance or sound insulation is specified, how far materials have to be carried, and whether the house is occupied while the dust is being made. A single straight partition in a new-build is a different quotation from the same wall in a Victorian house with a sloping floor and a chimney breast in the way.

Finding the carpenter is what LokalMatch does. Write the work down once, with your postcode, the number of walls and what each of them has to achieve, and carpenters serving that area reply to you directly. Homeowners are never charged for this; the trades pay for the requests they receive. LokalMatch does not carry out work, does not set prices, and does not vet, rank or recommend anyone, so checking insurance, references and what each quotation actually includes remains your decision.