Padstone
Plain English. Practical detail. UK context.
A padstone is a designed bearing component used to distribute a concentrated structural load into suitable supporting construction. It is often associated with a beam end, but its size, material and support cannot be selected from the beam length alone. It forms one part of the complete load path.
Last reviewed: (editorial review against the public sources listed below).
Why a bearing may need one
A beam can transfer a substantial force into a relatively small bearing area. The supporting wall and construction beneath must be able to receive it. A padstone may form part of the solution, but some designs use a different suitable arrangement. The structural designer needs the actual loads, masonry condition, geometry and support. A homeowner should ask for the bearing detail rather than assume the builder will insert a standard block. Trainees should identify which dimensions and materials are specified and what existing conditions still need confirmation.
The support below still matters
A strong component cannot make weak or unsuitable supporting construction adequate by itself. Previous openings, cavities, damaged masonry and the path to foundations may affect the design. An apparently convenient position may not provide the intended bearing or stability. The contractor must report discrepancies before work proceeds. Do not stack arbitrary units or alter a specified bearing because the beam sits slightly high. This overview gives no universal padstone dimensions, mortar detail or installation sequence; those decisions belong to the actual engineered arrangement and competent construction planning.
Regulation and construction sequence
Approved Document A gives structural guidance for England, with different national standards elsewhere. Building-control arrangements should be confirmed for the alteration. Permanent bearing design and temporary support during opening-up are distinct but coordinated tasks. HSE construction guidance is relevant to planning, handling and stability. A completed-looking bearing is not permission to remove temporary works without the required decision. Trainees should learn which checks occur before concealment and where a designer or supervisor must resolve a question. Neither planning permission nor a neighbour's agreement replaces suitable structural design.
A clear quotation and completion record
Include the design reference, component specification, supporting construction, preparation, checks and making good in the scope. Clarify who handles newly exposed defects and authorises changes. Homeowners should retain calculations, drawings and inspection information together with other structural records. Prices and outcomes vary from job to job, so compare written, itemised quotations rather than relying on a typical figure. For tradespeople, photographs can help show concealed stages but do not replace required assessment or verification. The useful handover records what was actually built and any approved change rather than merely state that a padstone was fitted under the steel.
Frequently asked questions
Does every beam need the same padstone?
No. The loads, support, material and geometry determine a suitable designed bearing arrangement.
Can a padstone compensate for any weak wall?
No. The complete supporting construction and load path need assessment; one strong component is not a universal remedy.
Sources and further reading
Public sources and further reading. Sources checked: 8 November 2026. Consult the original for details and later changes.