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Sitestack

In every plan

Part L photo evidence, kept as you build

Every site photo carries its date, time and location. For new homes, tag each photo to a plot and an Appendix B detail, then download a report and a ZIP for building control.

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Best for: Housebuilders and contractors building new dwellings who need to show the energy assessor and building control what was built. In every plan, nothing extra to pay.

Photos that carry their own proof

  • Date, time and location

    Photos taken in the app record when and where they were taken. A photo taken offline keeps its real capture time when it uploads later.

  • Location checked

    For Part L photos the app asks for a usable location fix. A photo with a very weak or missing location is not accepted as Part L evidence, and a weak one is flagged.

  • Live photos for Part L

    Picking an existing file from a desktop cannot prove when or where it was taken. So Part L evidence is added from a phone or tablet camera.

  • Blur before upload

    Draw boxes over faces, screens or paperwork. The photo is blurred on your phone, and only the blurred copy is uploaded.

Tagged to the Appendix B details

  • Plot and detail on each photo

    Choose the area, the Appendix B detail and the plot. A photo of the eaves on plot 1 is labelled P1/3b. Not sure of the detail yet? Upload now and choose it later.

  • Six areas, with a coverage check

    Foundations and ground floor, external walls, roofs, openings, airtightness and building services. A bar shows which areas still have no photo, before the work is covered up.

  • A hint for each area

    Each area says what a photo of it needs to show, so the right shot is taken while the detail is still open.

Downloads for building control

  • The Part L evidence report

    A PDF listing every tagged photo against its detail, with when and where it was taken and a summary of which areas are covered.

  • A ZIP of the photos

    One file per photo, named by plot and detail, such as P1_3b.jpg. The date, time and location are written into each image, with a list of the same facts alongside.

  • Any photos, stamped

    Choose photos in the gallery and download them with the date, time and location printed below the picture. The picture itself is not covered.

The real app

On the phone and at the desk

Big buttons on site. Tables, filters and every record side by side in the office.

The photos screen for a new home on an office screen, with a warning that two of six Part L areas are covered, a filter for each area and a row of three photo thumbnails.
At the desk. Photos filed by Part L area. A warning says which areas still have no photo and which photo still needs its detail.
The photos screen on a phone, with the coverage warning, the Part L area filters and three photo thumbnails.
On the phone. The same coverage check on a phone.
One Part L photo open on an office screen: insulation boards fixed across a pitched roof, with the date and time it was taken, its Appendix B reference P1/3a and a link to view the place it was taken.
At the desk. Each photo carries when it was taken, where, and its plot and detail reference.
The same photo on a phone, with the time taken, the reference, a link to view the location and a button to download it with date and location.
On the phone. On a phone, download any photo with its date and location printed on it.
A page of the Part L evidence report on an office screen, with a rooflight photo under the Openings heading. Under it are its reference P1/4a, the date and time it was taken, its GPS position and how accurate that is.
At the desk. The evidence report lists each photo with its reference, its date and time and its location.
The first page of the Part L evidence report on a phone, a coverage summary for the six areas that shows which details have a photo and which do not.
On the phone. The first page counts the photos for each detail and flags what is missing.
A rooflight photo on an office screen with a stamp printed below it giving the date and time, the GPS location and its accuracy, the site address and the Part L reference P1/4a.
At the desk. The stamp is printed below the picture, so the date, time and location travel with each photo.
A roof insulation photo with a stamp below it that reads 12 August 2026 at 11:26 BST, with its GPS location, accuracy and the reference P1/3a.
On the phone. The picture itself is not covered by the stamp.

Screenshots show demo data.

Plain words

What it does and does not do

What it does not do. Part L evidence in Sitestack is for new dwellings only, following Appendix B of Approved Document L. Sitestack helps you keep the record. It does not make a building comply, and it does not replace the advice of your energy assessor or building control. Check your own obligations.

Questions

Photo evidence: what people ask

Does Sitestack mean my build meets Part L?
No. It helps you keep a dated, located photo record of the details, labelled the way Appendix B asks. Whether the build meets Part L is for your designer, assessor and building control.
Does it work for extensions or refurbishment?
The Part L evidence tools follow Appendix B, which is for new dwellings. For other work you can still keep dated, located photos, but the plot and detail labelling is built for new homes.
What does building control receive?
You download a PDF report and a ZIP of the photos. Each photo is named by plot and detail, and carries its date, time and location inside the file. You send them on yourself.
Can I add the photo later if I forgot the detail?
Yes. Upload the photo, then open it and choose the detail. The coverage bar tells you how many still need one.
What if there is no signal on site?
Sitestack keeps photos on the phone and uploads them when the connection returns. The capture time stays the time the photo was taken.
Can clients and consultants see the photos?
You choose. A job setting keeps photos inside your company, and individual photos can be kept to your team.

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