Combined instructions

Part L packages that cover the whole project.

Most projects need more than one piece of Part L work: a calculation at design stage, another once it is built, and a certificate at the end. These packages bundle what belongs together, under one fee and one point of contact. Every figure is a guide band — you get a fixed written quote before anything starts.

Site office desk with rolled drawings, a hard hat and a laptop showing an energy model, overlooking new-build houses

6 packages

Choose the package that matches your project.

Not sure which one fits? Tell us what you are building and we will say which package applies, or quote the individual services instead if that works out better for you.

UK housing development under construction, with brick houses at several stages and scaffolding along a site road

For housebuilders and developers

Developer Part L package

Sites of two plots upwards where the same team should hold Part L from design through to completion.

From £120 per plot, guide only

Completed new-build brick house with a new front door and driveway, ready for handover

For completion and close-out

New build handover package

Finished or nearly finished dwellings where the as-built evidence and certificates still need to be produced.

Quoted per site, guide only

Single self-build house under construction in open countryside, with architectural drawings on a workbench in front

For self-builders and one-off homes

Self-build package

One-off houses, custom builds and replacement dwellings where you are managing the project yourself.

£150–£300 single plot, guide only

Modern single-storey rear extension under construction with large glazed sliding doors onto a garden

For homeowners and small builders

Extension and conversion package

A single extension, loft conversion, garage conversion or change of use on one property.

Quoted per project, guide only

British mixed-use building with shopfront units at ground floor and brick apartments above

For mixed-use schemes

Mixed-use package

New or converted buildings combining dwellings with commercial or community space.

Quoted per scheme, guide only

Empty modern office floor being fitted out, with exposed ductwork, linear LED lighting and a glazed facade

For commercial buildings and fit-outs

Non-domestic package

Offices, retail, industrial, hospitality and community buildings, and unit fit-outs within them.

From £350 guide only

Work it out first

Free tools before you commit to anything.

These are guidance tools. They help you work out what applies and what to prepare — only a full SAP or SBEM calculation can confirm compliance.

Part L 2026 transition checker Design-stage information checklist Part L 2021 vs 2026 comparison Extension glazing area check Part L fee guide

Prefer to instruct a single piece of work? See all Part L services or look at the guide fee bands.

Tell us what you are building and we will quote it.

Send the drawings and the plot schedule. You get a fixed written fee, the programme and a list of anything still needed — usually the same working day.

020 3092 8551

Guide bands only. Fixed quote in writing before work starts.