Sketch

G2G2 SKETCH — THE COMPLETE GUIDE

A 3D building sketcher that runs in your browser. Nothing to install, no

account, works offline once loaded. Feet and inches or metric, switchable

any time. Built for a phone first.

You don't need to know any CAD. If you can describe a house out loud, you

can draw one here.

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1. THE FASTEST WAY IN

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Don't draw the outside walls by hand. Describe them.

  1. Tools, then Build tools, then Paste a drawing.

  2. Tap AI prompt, then Copy all.

  3. Paste it into any AI chat. Then describe your building:

     "A house 40 by 30 feet, 10 foot walls, a door in the middle of the

     front with a window either side, 6 pitch roof."

  4. Copy the reply, paste it in the box, tap Draw it.

Walls, door, windows and roof in about a minute.

Tap Example to load a ready-made house. Tap it again for a castle with

four towers, which shows off round towers, battlements and exact door

placement.

GIVE IT ROUND NUMBERS. 40 by 30. Ten foot walls. You'll fix the real

sizes by dragging.

IT WON'T MAKE THINGS UP. Leave out a wall thickness and it says so

instead of inventing one.

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2. ALREADY HAVE A PLAN? IT LIFTS IT INTO WALLS

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Tools, then Floor plan. Open any plan image, JPG, PNG or WebP. Square it

up, set the scale off one known dimension, then tap Detect walls. It

finds the walls and turns them into real ones you can clean up by hand.

Set a thickness and a height, tap Build in 3D.

An old plan, a builder's drawing, a photo of something on paper. The

image stays on your device.

PDFs aren't read directly. Screenshot the page first.

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3. WHAT'S ON SCREEN

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TOP ROW, left to right:

  Floppy disk    Save into this browser

  Open folder    Reopen the saved drawing

  Down arrow     Download the model as a file

  Up arrow       Open a model file

  Camera         Save a PNG of the current view

  Folded map     2D Blueprint, a proper floor plan

  Sheet of paper PDF plans

  Two squares    Duplicate the selection

  Trash can      Delete the selection

  IMP / MET      Feet and inches, or metric

  Tools          Everything else

BOTTOM ROW. Swipe it sideways on a phone.

  Arrow cursor    Select                  S

  Crossed pencils Rough floor plan        F

  Square          Square / rectangle      R

  Circle          Circle                  C

  Triangle        Triangle                T

  Little house    Gable roof              G

  Open door       Window / door opening   W

  Up arrow        Push/Pull               P

  Four arrows     Move & snap             M

  Curved arrow    Rotate                  Q

  Orbit ball      Orbit                   O

  Undo / Redo     sixty steps of history

  Fit view        frames everything

DOWN THE LEFT SIDE is a stack of chips. Hold any one of them for half a

second and it tells you what it does. The green HIDE button at the

bottom collapses the whole stack, the way Tools does on the right.

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4. THE CHIPS

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ROOMS   Floats every enclosed room's area and its real wall-to-wall size.

        Drag a partition and both sides update as you move it. You stop

        measuring and slide the wall until the bedroom says 120.

        If two rooms show ONE number, the wall between them has a gap.

        That's free mistake-catching.

SPLIT   Drag your finger across a room. A wall lands along your drag with

        both ends buried in the walls either side, so it can't leave a

        gap. Snaps to whole feet measured clear of the near wall, shows

        both resulting areas as you drag, and offers you a doorway when

        you let go. Split either half again.

TAP     Pick Door, Window or Slider, then tap a wall where you want it.

        It slides in if you tap near an end, refuses if it would land on

        another opening, and tells you the measurement if the wall is too

        short.

CUT     Tap a wall anywhere. It becomes two pieces. Keep both, or delete

        the half you don't want.

STAIR   Select a box first. Fills it with a switchback and a landing at

        half height, solving the rise and tread for that box. Toggle

        which end the bottom flight starts from and which side it climbs.

        If nothing fits it says what to change, with the number.

BUILD   Runs the model through the order it would actually go up: slab,

        walls to lintel, openings cut, walls to full height, roof, then

        fittings. If your model has no slab or no roof it makes plain

        ones so the sequence reads, and Keep slab & roof puts them in for

        real. Done restores your model untouched.

EYE     Drops the camera to 5 ft 10 in standing height so you can walk

        the plan. Turn, walk, jump to any corner or the middle. Walls

        don't stop you.

TIDY    One tap. Squares up walls that are nearly square, grows wall ends

        into proper corners, and raises walls to match their neighbours.

        It never shortens or cuts anything down.

MAKE IT REAL

        Hands you the prompt that turns a screenshot of this model into a

        photoreal picture in any AI image tool. Line up the view, tap the

        camera, copy the prompt, attach the PNG.

GOOGLE EARTH

        Puts the building on the real ground. See section 6.

SHOW    Switches every measurement between feet-and-inches and straight

        inches, or metres and millimetres. Handy while nudging.

FREEZE  Locks everything loose so it can't be nudged, and leaves what's

        already frozen alone. Build a bit, freeze it, build the next bit.

        The number on the chip is how many parts are still loose.

        Unfreeze all releases the lot, and the press-and-hold lock has

        its switch in there too.

CLEAR ALL

        Wipes the whole model. One tap arms it and the chip asks SURE,

        the second tap does it. Undo brings everything back.

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5. NAMING AND FURNISHING ROOMS

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With ROOMS on, tap the orange "+ name" floating in any room. A panel

opens with twelve one-tap names, a text field for anything else, and

arrows to step through every room in the model so none is unreachable.

Names are saved in this browser and survive reopening a model.

FURNISH THIS ROOM is the orange button in that panel. Name the room, tap

it, and it fills:

  Bedroom    queen if there's walking room both sides, otherwise a

             double, against the longest wall with no door in it.

             Nightstands and a wardrobe if there's space.

  Living     sofa against the longest doorless wall

  Dining     the ten-seater if the room is big enough, the six otherwise

  Kitchen    counter run along the longest free wall, fridge on the next

  Bathroom   toilet and vanity along one wall, shower opposite

  Office, Closet, Garage, Laundry, Porch each get the obvious thing

Doors are avoided. It won't stand a bed across a doorway. If something

won't fit it says why with the number: "A bed needs 6' 11" and this room

has 5' 3"."

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6. PUTTING IT ON THE REAL GROUND

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Tap GOOGLE EARTH. Type the latitude and longitude of the spot, or tap

Use my location. Facing is the compass bearing the top of your plan

points, 0 north, 90 east.

NUDGE IT INTO PLACE without retyping anything: North, South, West, East

by 5, 10 or 25 ft, turn by 1 or 5 degrees either way, or a quarter turn.

A line underneath reads back exactly where it sits.

SITS LEVEL plus a pad height puts the building on a flat pad at that

elevation, which matters on a slope. Leave the pad blank and it follows

the ground, which can never be buried by terrain.

SAVED SITES. Name a placement and save it. Load brings back the

coordinates, facing, offsets and pad in one tap. It also remembers the

last placement you used on its own.

Download KML, then open it in Google Earth. The file is named for its

placement, so a folder of attempts tells you which is which.

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7. THE FLOOR PLAN

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Tap the folded map icon.

It's drawn as a real plan, meaning a horizontal cut at 4 ft. Walls the

cut passes through are filled solid. Furniture and anything below the cut

is a thin dashed outline. Roofs aren't drawn at all, because they're

above the cut.

What's on the sheet:

  Door swings, a dashed arc and a leaf line on every door

  Openings marked in cyan

  Running dimension strings along the top and down the left, with a tick

    at every wall face and every opening edge, measured to the face

  Overall width and depth

  Every room's name and area

  A title block with the approximate scale at A4, the date and the units

  A scale bar

  A north arrow

ONE PAGE PER STRUCTURE. If your model has more than one building, each

gets its own page at its own scale. The viewer shows the largest and says

"Structure 1 of 2"; the PDF contains them all.

The PDF is portrait and ends with the current 3D view.

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8. BLOCK AND COST TAKEOFF

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Tools, then the concrete block takeoff. It reads every wall in the model,

subtracts the openings, and gives you blocks, cement bags, sand and

rebar. Choose 4, 6 or 8 inch block.

Fill in your local prices and your mason's mortar allowances and it

totals the lot. Cement and rebar round up to whole bags and whole

lengths, because that's how you buy them.

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9. DRAWING BY HAND

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The loop is: draw a footprint, pull it up, slide it into place.

  Square / rectangle, Circle or Triangle. Drag a footprint on the grid.

  Push/Pull. Drag it up, or type 8 ft, 32 in, 2.4 m, 450 mm and Apply.

  Move & snap. Drag it. Release near another shape and it seats on it.

Triangle has a sliding point and per-side heights, so you can build real

slopes. Gable roof adds a roof to a box's top face in one tap. Window /

door opening cuts a real hole through any face.

Rough floor plan lets you trace wall centrelines with one finger. It

straightens your corners and builds connected walls you can lift

together.

Free / X / Y / Z locks a drag to one direction. Work plane is the height

you're drawing at; raise it, or select a solid and choose Use object top,

and you're drawing upstairs.

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10. IT TALKS BACK

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To text turns whatever you've drawn into plain text you can copy into a

chat: "make the back wall 4 feet deeper and put two windows on the north

side." Paste the answer back and tap Clear & draw.

Room names and areas ride along in the exported text as comments.

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11. IF SOMETHING SEEMS ODD

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Two rooms showing one number

  The wall between them has a gap. Stretch it until it touches.

Tapping one wall lights up the whole building

  It's grouped. Tap Ungroup in the Paste a drawing panel.

Push/Pull won't grab a face

  It's grouped, frozen, or locked purple. Press and hold to unlock.

A pasted drawing didn't appear

  Check the last line really says END_OBJECT. Long pastes get cut off by

  the phone's clipboard. Split it and use Draw it for the second half.

A door or window won't drag

  Don't try. Tap it and use the pad that appears. Move and Size buttons,

  in 1 in, 3 in, 6 in or 1 ft steps.

Buttons missing from a panel

  You're on an old copy of the page. Force a reload.

Everything vanished

  Undo goes back sixty steps, or Tools then Restore.

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12. WHAT IT ISN'T

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Curved walls, apart from round towers. Hip roofs, since it does flat and

gable. Arches. Terrain and slopes. Not engineered, not to code, not a

permit drawing.

It's for working out how big things are and where they go, fast, before

you commit to anything.