Construction AutoCAD MCP

Construction AutoCAD MCP

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Construction AutoCAD MCP lets Claude work directly in the drawing you have open in AutoCAD. Its main job is drafting: from a scanned or photographed plan, a sketch, a render or a 3D model, Claude draws a complete, layered 2D drawing (walls with clean junctions and material hatches, doors and windows cut into the walls, columns, grids with bubbles, stairs, rooms with measured areas, dimension chains, symbols, a sheet with a title block and a PDF). From the same plan it derives the elevations and sections, draws reinforced-concrete details (beams, columns, footings) with their bar schedule, and the interior design set: furniture layout, floor finish and ceiling plans, interior elevations of each wall, joinery shop drawings and the finish schedule. It also reads drawings, takes off quantities by layer and block, and checks drawings for common problems.

It works like SketchUp MCP: a Claude Desktop extension (.mcpb) that runs on the Node.js built into Claude Desktop, plus a small add-in that runs inside AutoCAD (the ACAD MCP Bridge, a .NET add-in). No Python or Node.js install is needed.

Current version: 1.2.1 - download it from Releases. Also listed in the official MCP Registry as io.github.2ez4gcx/construction-autocad-mcp.

Features

53 tools. Lengths are in drawing units (mm in a metric drawing), areas in m², angles in degrees counter-clockwise from +X.

Highlights:

• Asks before it assumes: before drawing, Claude lists what the request leaves open (dimensions it cannot read, heights, roof, materials, furniture, structural sizes...) with the value it would use, and draws once you confirm or change them. draw_plan, draw_elevation, draw_section, draw_structure_detail and the interior drawing tools take dry_run=true to list the defaults they would apply without drawing, and every result reports the defaults it used (assumed).
• A complete plan in one step (draw_plan): Claude describes the plan in millimetres, as read from the image (wall axes and thicknesses, openings by wall and offset, columns, grids, rooms, stairs, levels, section marks, north arrow) and the tool draws it all in one Undo step:
• walls are unioned, so L, T and X junctions come out clean, with a different hatch per material (brick, concrete, block, light, stone, solid);
• doors (single, double, sliding), windows and plain openings are cut out of the walls, with leaf, swing arc and glazing lines;
• columns are cut out of the walls and hatched; a column can be placed at every grid intersection;
• grids get bubbles at both ends (1, 2, 3... across, A, B, C... up), exterior dimension chains (openings, grid spacing, overall size) are added on the sides you choose;
• room areas are measured from the walls, never typed: each room is a point inside it; the label shows the name and the measured area (a name wider than the room is wrapped onto two lines and the label kept off the walls), a closed boundary goes on A-AREA (not plotted) for takeoffs, and spaces closed by walls but without a room are reported.
• Elevations and sections from the plan (draw_elevation, draw_section): built from the same description as draw_plan, so they always agree with it. Heights (floor, ground, wall top, door heads, window sills and heads, foundation) and roofs (gable with either ridge direction, pitch, overhang, or flat with parapets; several roofs, e.g. a porch) are given once.
• elevations from any side: the nearest walls and columns win, hidden lines are removed, roofs show the eaves side (tile ribs) or the gable end, doors and windows with frames, plinth and ground lines, level marks, height dimension chains, grid bubbles with their spacing, title;
• sections along the plan's section mark (or any cut line): slabs, roof slabs, lintels and the beams under the slabs on every cut wall drawn solid (poché, beam_depth default 300), cut walls hatched with lintels over the openings they cross, each room's ceiling at its finish level with its drop bands and hangers up to the slab and its ceiling and floor codes, level marks on both sides tied to the building by extension lines, footings with lean concrete, floor slab and fill, a porch slab out to its columns, the roof cut, walls, doors and windows seen beyond, room names, levels and grids;
• ornaments seen in a photo (gable windows, cladding, finials) are added with draw_entities on A-ELEV.
• Three sets, three files: architecture (KT), structure (KC) and interior (NT) are separate drawings, as a design office issues them. Each is made with new_drawing from the same plan description and has its own drawing list (draw_drawing_list, sheet KT-00 / KC-00 / NT-00), sheet numbers and title block item (KIẾN TRÚC, KẾT CẤU, NỘI THẤT). The structural and interior tools work in a file without the architectural plan: AutoCAD computes the room outlines from the plan description without drawing it (draw_plan rooms_only). Example: examples/Nha-pho-5x18-KT.pdf, -KC.pdf, -NT.pdf.
• Roof plan (draw_roof_plan), for flat roofs:
• the parapets and the stair tower of the top floor, with grids and dimensions;
• the tower roof hatched, the roof terrace;
• floor drains with falls (i=2%) and rainwater pipes;
• the levels of the terrace, the parapet top and the tower roof;
• notes on waterproofing, screed to falls and pipes.
• Cover sheet (draw_cover_sheet): "HỒ SƠ BẢN VẼ ", the phase, project, item, client, consultant, contractor, location, date; every set starts with its cover and its drawing list.
• Door and window schedule (draw_door_schedule):
• every type (by tag, kind and size, on every floor) drawn in elevation with its frame, leaves and opening direction (dashed lines meet on the hinge side) and glazing;
• its width, height and sill dimensions, its tag and count;
• the table: tag, kind, W x H, sill, count by floor, description.
• Stair detail (draw_stair_detail), for a U stair:
• the stair plan on each kind of floor (start, typical floors grouped, arrival) at 1:50, with the walls around it, the treads numbered, run / landing / width dimensions (n x going), floor and landing levels, grids and the section mark;
• section 1-1 along the flights: the cut flight with its RC waist slab and landing, the flight beyond, slabs and walls cut, handrails with balusters, riser dimensions (n x riser) per flight, floor heights and levels;
• build-up notes of treads and landing, with 2h + b;
• the tread and handrail detail at 1:20 (granite, mortar, brick steps, waist slab, plaster, handrail, balusters), drawn apart: one sheet holds both through create_layout views.
• Preliminary structural calculation (structural_calc), to be checked, calculated again and signed by a licensed structural engineer:
• loads by TCVN 2737:2023: slab build-ups, live loads by room (rooms 1.5, halls and stairs 3, balconies 2 kPa ...), partitions, walls on the beams less their openings, self-weight;
• slab panels shared out to their beams (two-way trapezoid / triangle, one-way), continuous beams with the live load on all / odd / even spans, end supports qL²/24;
• bending and shear by TCVN 5574:2018 (αm, ξ ≤ ξR, As, bars; stirrups at the supports and midspan); the designed bars go to draw_beam_schedule;
• column loads floor by floor down to the footings (a column standing on a slab hands its load to the beam under it), column capacity, footing area for the soil pressure;
• a sheet of tables (materials, slab loads, build-up, beams, columns and footings, assumptions) with the sign-off: calculated, checked, structural lead (name, licence No., signature, date); CSV for Excel;
• xlsx_path: a live Excel workbook: the inputs in yellow cells (materials, layer thicknesses and unit weights, load factors, live loads, soil pressure, column and footing sizes, q, bars), everything else as formulas (g, p, M, αm, ξ, As, checks, stirrup spacing, column capacity, footing area), so it calculates again when a value changes.
• Bar schedule and bill of quantities (draw_quantity_schedule):
• the bar schedule of the whole set: footings, columns, ground beams and beams as designed, slabs and stairs by the detailing rules; laps and anchorage, weights as table formulas, totals per diameter, flowing over pages;
• the bill of quantities with how each item is made up: lean concrete, concrete and formwork of footings, column stubs, ground beams, columns per storey, beams, slabs, stairs; steel by grade; brick walls by thickness (m², m³) less the openings; plaster inside, outside and of the soffits; CSV for Excel;
• xlsx_path: the whole structural workbook (the calculation, the bar schedule with its weights as formulas, the quantities as formulas of how they are made up).
• Architectural finish quantities (draw_finish_quantities): floor tiles by finish, wall tiles, skirting; skim coat and paint inside, outside (the faces with no room on their side, plinth, parapets) and of the ceilings; gypsum ceilings; waterproofing of toilets, balconies and the roof terrace; screed to falls and the tower roof; stair granite and railings, balcony railings; doors and windows by type. The rooms and finishes are those of the interior set. A table with the quantity of every floor, CSV, and an Excel workbook with a column per floor and the total as their sum.
• Structural set (draw_structure_plan, draw_beam_schedule, draw_structure_notes):
• draw_structure_plan floor=foundation draws the foundation plan: pad footings M1 under the columns (hidden), ground beams GM under the ground floor walls, the footing size and bottom level;
• draw_structure_plan draws the framing plan of each slab (floor 2, 3 ... and the roof):
• beams along the load-bearing walls of the floor below (partitions under 150 mm stand on the slab), named per slab (D2.1 ..., DM.1 for the roof) with b x h and their count;
• columns at the wall nodes;
• the slab thickness, wet rooms and balconies lowered 50 (hatched), stair openings crossed;
• grids with bubbles and dimensions.

Sizes are preliminary (h = span/12, rounded up to 50, 300-700) and reported as assumed, for the engineer to confirm.

• draw_beam_schedule gives every beam type its support (GỐI) and midspan (NHỊP) sections, with the slab flange, the FL level, bars and stirrups, titl