Every renovation job lives or dies on the survey. Get the dimensions wrong on day one and you will pay for it in mis-cut joinery, plumbing that does not line up and a client who stops trusting your numbers. Professional measured-survey firms work to a final drawing accuracy of around ±5 mm — and charge accordingly, with a typical house taking 1–3 hours on site and 5–8 working days to deliver drawings. This guide shows how to get renovation-grade floor plans yourself, same day: measuring on site, sketching options with the client in the room, and handing clean files to the office — using nothing but the iPhone or iPad already in your pocket.
Know what your drawings will be used for
Renovation plans are not just for you. Before you measure anything, think about who downstream will read the drawings, because that dictates how you capture and present them:
- Planning applications — UK local authorities expect floor plans at 1:50 or 1:100, with existing and proposed layouts clearly distinguished (separate drawings, or bold/hatched changes on one sheet), plus a title bar showing scale and paper size. Site location plans are typically 1:1250 or 1:2500.
- Building control — structural alterations, extensions and every loft conversion that creates a habitable room need building regulations approval, whether or not planning permission applies. A full-plans application with dimensioned drawings typically takes around 5 weeks to be decided, so a clean, accurate as-built at the start keeps the whole programme honest.
- Party wall notices — if you are cutting into a shared wall, you must serve notice 2 months before starting; excavating within 3 metres of a neighbouring structure and deeper than its foundations needs 1 month's notice under the Party Wall etc. Act 1996. A dimensioned plan showing the work and distances is what makes those notices stick. Rules and interpretations vary, so confirm specifics with a party wall surveyor or your local authority.
None of this requires an architect's drawing board. It requires accurate dimensions, a clear existing-versus-proposed story, and files in the formats each audience expects — which is exactly what the rest of this guide covers.
Capture the existing space accurately
Before you can propose anything, you need a faithful record of what is already there — the as-built. The old method is a tape measure, a clipboard and a hand sketch you redraw back at the office. It works, but it is slow and easy to fumble: a transposed digit or a forgotten alcove can throw out an entire kitchen layout.
RoomPlot gives you two faster routes, and you can mix them on the same job:
- LiDAR scan — on an iPhone or iPad Pro with a LiDAR sensor, walk the room and the app detects walls, doors and windows automatically. A whole flat can be captured in minutes rather than a morning.
- Manual draw with smart snapping — on any supported device, draw walls by hand and type in the exact lengths from your tape or laser. Ideal for awkward corners, or for verifying a scan against the figures you trust.
Because RoomPlot supports metric or imperial units throughout, you can work in whatever your client and your subcontractors expect — and switch between the two without re-keying anything. On-plan dimensions mean the measurements are always visible, not buried in a separate notebook, and the North marker lets you orient the plan the way planning drawings are read.
Sketch the options with the client in the room
The moment that wins renovation work is showing a client what their space could become, while you are standing in it. With a clean as-built loaded, you can edit the geometry directly: move, resize, rotate, add or delete any wall, door, window or opening. Knock a stud wall through and the room opens up on screen; reposition a doorway and the layout reflows.
A few habits make these on-site sessions smooth:
- Use snapping and the grid so new walls line up cleanly and you are not fighting fractions of a millimetre while a client watches.
- Lean on undo and redo to try a bold change, see the client's reaction, and step straight back if it does not land. Every edit is reversible, so experimentation costs nothing.
- Switch to 3D to show how the new layout actually feels — RoomPlot edits the same plan in 2D and 3D, so a client who cannot read a 2D drawing still gets it instantly.
- Attach evidence as you go — pin notes, photos and voice memos to the plan: the crack above the lintel, the stopcock behind the panel, the client's exact words about the island. When the office asks a question three weeks later, the answer is on the plan.
Because each change is just an edit, you can save a couple of variations and let the client choose — far more persuasive than describing the idea and hoping they picture it. It also feeds the planning pack directly: keep one plan as the surveyed existing and a copy as the proposed, which is exactly the pairing local authorities ask for. For a refresher on the basics, see our guide on how to create a floor plan.
Keep the numbers exact
Renovation is unforgiving about dimensions. A cabinet run that is 40 mm too long, a beam pocket cut to the wrong centre, a soil pipe that clashes with a joist — each one is a return visit and an awkward conversation. RoomPlot keeps the figures honest in a few ways:
- Automatic area calculation — the app detects rooms and works out each area for you, so you can quote materials and labour from real square-metre figures rather than a rough guess. You can also set an area manually where you need to.
- Live dimensions on the plan — so the number you cut to is the number on the drawing, not one you reconstructed later from memory.
- Multi-select — select several elements at once to move, restyle or delete them together, or rotate the whole plan to match how the drawings will be read on site.
Accurate areas also matter commercially: quoting a kitchen refit from a guessed 18 m² when the room is actually 15.4 m² is margin you gave away before the first skip arrived.
Handle the whole property, floor by floor
Few renovations are a single room. A loft conversion, a full refurbishment or an extension touches several storeys, and the office needs them as one coherent set. RoomPlot is built for multi-floor projects: add floors, switch between them, and keep the whole building in one file. Scan the ground floor, walk upstairs, carry on — it is all one project.
That matters most when the trades downstream — structural engineer, kitchen supplier, building control — each want the property presented their own way. Building control will expect every affected storey on the drawings, and a loft conversion is inspected at least three times (structure, mid-stage, completion), so the plan set has to hold together across floors. One project, many outputs, no re-measuring.
Hand clean files to the office and to the client
A survey is only finished when other people can use it. RoomPlot exports in the formats both halves of a renovation job actually need:
- DXF / CAD for the office or the designer — drop the plan straight into your CAD package and start detailing at 1:50, instead of redrawing it from a photo of your sketch.
- PDF reports — a single-page plan or a multi-page branded report with your company logo and details, so what lands in the client's inbox looks like it came from a professional outfit, not a phone.
- PNG / JPG at A4, 300 dpi or 1080p for quotes, emails and job sheets.
- USDZ 3D model when you want to share a walkthrough of the proposed space.
The split is the point: the technical file goes one way for accuracy, the polished document goes the other for trust. You measure once, on site, and both audiences get exactly what they need. If you run a crew, turn on iCloud sync (Settings → iCloud Sync, per plan) so the office sees the survey before the van leaves the street.
Frequently asked questions
Do I need a LiDAR device to use RoomPlot for renovation work?
No. LiDAR scanning is faster and is available on iPhone and iPad Pro models with the sensor, but you can also draw plans by hand on a supported device and type in exact measurements from your tape. Many contractors combine the two — scan for speed, then verify the critical dimensions manually.
Can I give my CAD office an editable file?
Yes. RoomPlot exports DXF, which opens directly in standard CAD software, so your office can detail from the survey rather than tracing over an image.
Are RoomPlot plans acceptable for planning or building control?
Councils care about content and presentation, not which tool drew the plan: existing and proposed layouts clearly distinguished, a stated metric scale such as 1:50 or 1:100, and accurate dimensions. Export a dimensioned PDF and you meet those requirements for most householder applications — but requirements vary by authority and by project, so check your council's validation checklist, and use a structural engineer or architect where the job demands one.
How do I present options to a client on site?
Edit the geometry live — move walls, add or remove openings, reposition doors — and switch between 2D and 3D so the client can see the change clearly. Undo and redo let you trial ideas freely and back out instantly if they do not land.
Accurate floor plans for renovation do not have to mean a morning with a tape, an evening redrawing and a week waiting on a survey firm. Capture the space on your phone, shape the options with your client, and export clean files for the office and a branded report for the client — all from one visit. Download RoomPlot and turn your next site visit into a finished plan before you leave the driveway. Looking for more? Browse our more guides.