20 Plan Reading Practice Questions & Answers

1. 1. A patio edge measures 6-1/2 inches on a plan whose title block states the scale as 1/4" = 1'-0". What real length does that represent?

   • A.13 feet, since one inch on the sheet represents two feet on the ground
   • B.52 feet, since one inch on the sheet represents eight feet on the ground
   • C.26 feet, since one inch on the sheet represents four feet on the ground✓ Answer
   • D.6.5 feet, since the fraction scale converts inches directly into feet

   An architect's scale of 1/4" = 1'-0" means a quarter inch of paper stands for one foot of ground, so a full inch stands for four feet; 6.5 inches x 4 feet = 26 feet. The stated scale is a ratio, and converting is simply multiplying the measured paper distance by the number of feet each inch represents.

   Source: NALP Landscape Training Manual for Installation Technicians, Landscape Plan Reading & Calculations (architect's scale)Report a problem with this question

2. 2. On a site plan drawn at 1" = 20', a walk measures 4-1/2 inches between its ends. How long is the walk on the ground?

   • A.22.5 feet, because the measured inches are divided by the scale number
   • B.45 feet, because each inch on the sheet equals ten feet of ground
   • C.18 feet, because an engineer's reading is taken in tens and then halved
   • D.90 feet, because each inch on the sheet equals twenty feet of ground✓ Answer

   An engineer's scale is written as one inch equalling a whole number of feet, so at 1" = 20' each paper inch is twenty ground feet and 4.5 x 20 = 90 feet. The conversion is always a multiplication by the scale value, never a division, which is where the 22.5-foot answer goes wrong.

   Source: NALP Landscape Training Manual for Installation Technicians, Landscape Plan Reading & Calculations (engineer's scale)Report a problem with this question

3. 3. A technician reads a grading plan noted 1" = 30' using the 1/8" = 1'-0" edge of an architect's scale. What happens to the dimensions taken off that sheet?

   • A.Each distance comes out far too short, because that edge reads one inch as eight feet✓ Answer
   • B.Each distance comes out far too long, because that edge reads one inch as fifty feet
   • C.Only the curves read wrong, because straight runs do not depend on the instrument
   • D.The distances stay correct, because both instruments divide an inch the same way

   The two instruments divide the inch differently: the 1/8" architect's edge reports eight feet per inch while the sheet was drawn at thirty feet per inch, so every reading is scaled down by the same fixed factor. Using the wrong instrument therefore produces a consistent proportional error across the whole sheet rather than a random one.

   Source: NALP Landscape Training Manual for Installation Technicians (architect's vs engineer's scale)Report a problem with this question

4. 4. A wall section on a detail sheet is marked NTS and carries a written base-course thickness of 8 inches, but scaling the drawing suggests about 11 inches. Which value governs the work?

   • A.Eleven inches, because a detail sheet always outranks any dimension written on it
   • B.The average of the two, because NTS means the sheet was reduced during printing
   • C.Eight inches, because a written dimension governs and an NTS drawing may not be measured✓ Answer
   • D.Eleven inches, because the drawn geometry shows the designer's true intent on the sheet

   A written dimension always takes precedence over a measurement scaled off the paper, and NTS states outright that the drawing is not to any scale and must not be measured. The graphic is only a diagram of relationships in that case, so the numeral is the instruction.

   Source: NALP Landscape Training Manual for Installation Technicians (drawing precedence; 'not to scale' notation)Report a problem with this question

5. 5. Two planting plans from different design firms use the same spiky circle symbol for different plants. What does this tell the installer about plan symbols?

   • A.Each symbol is set by the nursery supplying the plant, and the tag governs the drawing
   • B.Each symbol follows a national drafting standard, and a spiky circle is always a conifer
   • C.Each symbol repeats across a firm's projects, and past jobs are the reliable guide
   • D.Each symbol means whatever that sheet's legend assigns to it, so read the legend first✓ Answer

   Plan symbols are not standardized between designers, so their meaning exists only in the legend printed on that particular sheet or set. Reading the legend before anything else is what keeps a familiar-looking symbol from being installed as the wrong plant or material.

   Source: NALP Landscape Industry Certified Technician (Exterior), Softscape Plan Reading component — plan symbols and legendsReport a problem with this question

6. 6. What does the north arrow on a landscape plan tell the crew, and what may they not assume from it?

   • A.It shows where the sun crosses the site, and shade patterns are drawn out from it
   • B.It marks the prevailing wind direction, and the top of the sheet always faces north
   • C.It locates the survey benchmark, and every elevation is measured out from that point
   • D.It fixes the sheet's orientation to the site, and north is not always toward the top✓ Answer

   The north arrow ties the drawing to real-world compass direction so the crew can rotate the sheet to match what they see on site. Plans are often but not always drawn with north up, because designers rotate the sheet to fit an odd-shaped lot, so the arrow must be read rather than assumed.

   Source: NALP Landscape Training Manual for Installation Technicians (plan orientation and title block information)Report a problem with this question

7. 7. On a planting plan the circles drawn for a row of shrubs overlap one another. What does that overlap represent?

   • A.The symbols are drawn at installed size, so the plants must be pulled apart in the field
   • B.The symbols show a massed bed, so individual plants may be left out where convenient
   • C.The symbols carry a drafting error, so the crew should cut back the quantity ordered
   • D.The symbols show mature spread, so plants at schedule spacing will not touch yet✓ Answer

   Plant symbols are conventionally drawn at the plant's mature spread, not at nursery size, so circles overlap on paper long before the installed plants touch on the ground. The technician therefore installs at the spacing given in the schedule and does not spread the row out to stop the circles from crossing.

   Source: NALP Landscape Training Manual for Installation Technicians (plant symbols drawn at mature size)Report a problem with this question

8. 8. A planting plan labels one group of circles 'QR (5)' and the schedule lists a row keyed QR. Several other unlabeled groups on the same sheet use the identical circle symbol. How does the technician establish the total quantity of QR?

   • A.Ask the nursery to divide the order evenly among the groups that share the symbol
   • B.Count every group drawn with that same symbol on the sheet and add the quantities up✓ Answer
   • C.Order the schedule quantity and place it all at the one location that carries the label
   • D.Plant the five at the label and treat the unlabeled groups as a different species

   Identical plants share one symbol and are commonly labeled at only one location to keep the sheet readable, so the key or code column is what ties every matching circle back to the same schedule row. The technician scans the sheet for the repeated symbol and totals the groups before ordering or laying out.

   Source: NALP Landscape Training Manual for Installation Technicians (plant list/schedule key and plan labeling)Report a problem with this question

9. 9. A schedule row for a shade tree reads 2.5" cal., B&B, and a shrub row reads #5, container grown. What do these designations describe?

   • A.Trunk diameter near the base with the ball wrapped in burlap, and a five-gallon pot size✓ Answer
   • B.Crown thickness at delivery with the roots cut back, and five plants minimum per group
   • C.Crown spread at planting with a wire basket added, and a bed spacing of five feet apart
   • D.Overall height in feet with the roots washed bare, and a five-year-old field-grown plant

   Caliper is the nursery measurement of trunk diameter taken near the base of the stem and is the standard way of sizing shade trees, while B&B means balled and burlapped: the plant is dug with an intact soil ball wrapped for handling. A container number such as #5 states the nominal pot volume in gallons rather than the plant's age or spacing.

   Source: ANSI Z60.1 American Standard for Nursery Stock (caliper, balled-and-burlapped, container class); NALP Installation Technicians manual (plant schedule columns)Report a problem with this question

10. 10. A plant schedule row gives the botanical name Acer rubrum and a common-name entry of 'silver maple'. How should the technician resolve the mismatch?

    • A.Furnish the plant named by the botanical entry and report the mismatch to the designer✓ Answer
    • B.Furnish whichever one the supplier has, since both names describe the very same tree
    • C.Furnish the plant named by the common entry, since the client reads the common column
    • D.Furnish a maple of similar size, since a schedule conflict allows an approved equal

    Common names are regional and ambiguous while the botanical genus and species identify one plant exactly, so the botanical entry governs when a schedule contradicts itself. The conflict is still a documented error, so the technician furnishes to the botanical name and has the designer confirm the intent rather than silently choosing.

    Source: NALP Landscape Training Manual for Installation Technicians (plant list — botanical vs common names); ANSI Z60.1 nomenclature conventionReport a problem with this question

11. 11. The plant schedule lists 24 of one shrub, but counting the symbols on the planting plan yields 27. What is the correct response?

    • A.Split the difference at 25 to cover breakage while keeping the cost close to budget
    • B.Report it to the supervisor or designer and get the quantity confirmed in writing✓ Answer
    • C.Install the 24 listed and leave the extra three symbols out of the finished planting
    • D.Install 27, because the drawn plan always outranks the numbers written in a schedule

    A schedule quantity that disagrees with the plan count is an unresolved conflict in the documents, and neither number is automatically right because either the table or the drawing may have been revised alone. The technician verifies by counting, then raises it with the supervisor or designer so the correction is documented before material is ordered.

    Source: NALP Landscape Industry Certified Technician (Exterior), Plan Reading component — resolving plan/schedule conflictsReport a problem with this question

12. 12. The crew needs the finished elevation at the corner of a proposed patio and also the offset dimension locating that corner from the house wall. Which sheets carry each?

    • A.The title sheet gives the elevation, and the demolition plan gives the offset dimension
    • B.The layout plan gives the elevation, and the detail sheet gives the offset dimension asked
    • C.The grading and drainage plan gives the elevation, and the layout plan gives the offset✓ Answer
    • D.The planting plan gives the elevation, and the irrigation plan gives the offset dimension

    Each sheet in a set answers a different class of question: elevations, contours and drainage live on the grading and drainage plan, while horizontal position and dimensions live on the site or layout plan. Knowing which sheet owns which information is what keeps the crew from scaling a number off a drawing that was never meant to carry it.

    Source: NALP Landscape Training Manual for Installation Technicians (types of plans in a landscape plan set); (grading and drainage plans)Report a problem with this question

13. 13. A layout plan note calls for a 4-inch compacted aggregate base under a walk, while the typical walk section on the detail sheet shows 6 inches. Absent other direction, which does the crew build?

    • A.Six inches, because the section detail governs construction thicknesses over the plan view✓ Answer
    • B.Six inches, because the greater number is always the safer choice on any base question
    • C.Four inches, because the sheet that locates the walk decides how the walk gets built
    • D.Four inches, because a note written on the plan outranks anything drawn on a detail sheet

    A plan view shows where things go, while a section or typical detail shows how they are built up in layers, so the detail is the controlling document for thicknesses and materials. Choosing the larger number for safety is not the rule either; the reason six inches wins is the hierarchy of the documents, not the size of the figure.

    Source: NALP Landscape Industry Certified Technician (Exterior), Hardscape Plan Reading component — sections, details and drawing precedenceReport a problem with this question

14. 14. On a grading plan with a 1-foot contour interval, the contours are tightly bunched along one side of a lawn and widely spaced across the rest. What does the bunching indicate?

    • A.The ground is nearly level there, since more lines means the elevation changes slowly
    • B.The contour interval changes there, since drafters tighten lines to fit a smaller scale
    • C.The ground falls steeply there, since the same interval is crossed in less distance✓ Answer
    • D.Standing water collects there, since bunched lines mark the limits of a low wet spot

    Every contour on a sheet represents the same vertical step, so the horizontal distance between them is what encodes steepness: close spacing means that step is climbed in a short run, which is a steep slope. Wide spacing means the same one-foot change is spread over a long run, which reads as nearly flat ground.

    Source: NALP Landscape Training Manual for Installation Technicians, Surveying, Grading & Drainage (contour lines and interval)Report a problem with this question

15. 15. Proposed contours across a lawn bend into a series of V shapes, and each V points toward the higher elevations upslope. What does this describe?

    • A.A terrace, and surface water is held on steps that drop down across the slope face
    • B.A swale, and surface water runs along it away from the V points toward lower ground✓ Answer
    • C.A ridge, and surface water sheds off both sides of the high line the V points trace
    • D.A berm, and surface water is turned aside by the raised line the V points trace out

    Contours bend upstream where they cross a drainage way, so a V pointing uphill marks a swale and water runs down the line of the Vs away from their points. The same geometry reversed, with the V pointing downhill, marks a ridge, which is why the direction of the point is the whole tell.

    Source: NALP Landscape Training Manual for Installation Technicians, Surveying, Grading & Drainage (contour behavior at swales and ridges)Report a problem with this question

16. 16. A grading plan shows one set of contour lines dashed and a second set solid, and in one area the solid line lies well outside the dashed one. What is being shown?

    • A.Proposed grade dashed and existing grade solid, and the dashed set is built after demolition
    • B.Property limits dashed and drainage limits solid, and the gap marks an easement strip
    • C.Two contour intervals overlaid, and the solid set is drawn only for the index elevations
    • D.Existing grade dashed and proposed grade solid, with cut or fill needed where they separate✓ Answer

    By drafting convention existing conditions are drawn dashed and new or proposed work solid, which lets both grades be shown on one sheet. Where the proposed contour pulls away from the existing one the ground must be moved to that new line, so the separation is exactly where cut or fill occurs.

    Source: NALP Landscape Training Manual for Installation Technicians (existing vs proposed contours; line-type convention)Report a problem with this question

17. 17. Two spot elevations on a lawn read 102.4 at the house wall and 100.9 at a point 50 feet away. What is the slope, and which way does the surface drain?

    • A.Three percent falling toward the wall, so surface water ponds against the foundation
    • B.Fifteen percent away from the wall, which is too steep to mow and would need terracing
    • C.Three percent falling away from the wall, so surface water runs off to lower ground✓ Answer
    • D.One and a half percent away from the wall, being the rise divided by the run in inches

    Slope percent is rise divided by run times one hundred, so (102.4 - 100.9) / 50 x 100 = 3 percent, both figures being in decimal feet. The higher number sits at the wall, so the ground falls away from the structure and surface water is carried toward the lower spot elevation.

    Source: NALP Landscape Training Manual for Installation Technicians (spot elevations and slope calculation)Report a problem with this question

18. 18. A layout plan locates a patio corner 12 feet from the house face and 8 feet from the property line, with no radius given. What is the sound field procedure?

    • A.Set the corner by eye from the house windows and shift it once the base has been placed
    • B.Measure each offset from the reference it names, stake the corner, then square it by 3-4-5✓ Answer
    • C.Measure both offsets from the nearest driveway edge, since offsets always start at paving
    • D.Scale the corner position off the sheet, since written offsets are approximate until staked

    Dimensions on a layout plan are meaningless without the reference they are taken from, so each offset must be measured from the exact feature the plan names, here the building face and the property line. Staking the point and then checking the corner with a 3-4-5 triangle verifies the angle before any base or edging is committed.

    Source: NALP Landscape Industry Certified Technician (Exterior), Plan Reading component — dimensioning, offsets and field layout from a reference lineReport a problem with this question

19. 19. A crew holds a planting plan stamped Revision 1 dated in March, and the office sends the same sheet stamped Revision 2 dated in May. Which governs the work?

    • A.The March sheet, because it is the copy that was in hand when the contract was signed
    • B.The March sheet, because a revision applies only to zones newly clouded on the new sheet
    • C.Either sheet, because a revision changes the drafting and not the work done in the field
    • D.The May sheet, because the latest revision supersedes every earlier issue of that sheet✓ Answer

    The revision block and date in the title block exist precisely to establish which issue of a sheet is current, and a later revision or addendum supersedes all earlier issues of that same sheet. Working from a superseded print is how crews install work that has already been redesigned and then have to remove it.

    Source: NALP Landscape Training Manual for Installation Technicians (title block, revision block and sheet issue dates)Report a problem with this question

20. 20. Locate marks in purple paint cross the exact spot where the plan puts a tree pit, and the plan sheet shows no utility at that point. What does the technician do?

    • A.Erase the marks and dig as drawn, since a stamped plan governs over field paint
    • B.Stop that excavation and take the conflict to the supervisor for a decision✓ Answer
    • C.Dig as drawn, since purple marks reclaimed water lines that lie below any tree pit
    • D.Shift the pit a few feet clear of the marks and note the move at the end of the day

    Under the APWA uniform color code purple marks reclaimed water, irrigation and slurry lines, and a locate mark is field evidence that the plan does not show; its depth is unknown from the paint alone. A conflict between marked utilities and the drawings is stopped and referred up, because relocating the work or digging through it are both decisions the technician is not authorized to make.

    Source: APWA Uniform Color Code (purple = reclaimed water, irrigation, slurry lines); Common Ground Alliance Best Practices — call 811 and hand-dig within the tolerance zoneReport a problem with this question

Practice questions based on the published content areas of the National Association of Landscape Professionals' Landscape Industry Certified Technician (Exterior) programme — the universal safety and hazard-communication elements every candidate takes, plus the plan reading, horticultural principles and calculation content behind the installation and maintenance specialties — together with standard horticulture, soils, turfgrass and hardscape construction references. This site is not affiliated with or endorsed by the National Association of Landscape Professionals. This bank covers written knowledge only; where a certification programme also assesses hands-on skill, that part is judged in the field and cannot be practised on a screen. Irrigation system design and troubleshooting, and arboriculture, are covered by our separate irrigation and arborist banks rather than here. Landscape work is governed by pesticide, licensing, water-use and vehicle rules that vary by state and locality — confirm what applies where you work, and confirm current certification requirements with NALP before testing. About NALP certification →