| RHP678 | Plan of the Water of Conon from the Cruives of Devil down to the Shore at Dingwall, Ross and Cromarty | 1763 |
| RHP839 | Bound plans and Sections of proposed branch railway of the Highland Railway Co. from the Dingwall and Skye section at Fodderty to Strathpeffer SPA: 1884 | 1884 |
| RHP932 | Plan of land required for the Inverness and Ross-shire Railway on the Estate of Brahan: 1862 | 1862 |
| RHP1457 | Plan of the estate of Brahan, with Tollie and Kildun, property of the Earl of Seaforth | 1765 |
| RHP1458 | Plan of the estate of Brahan | [c 1770] |
| RHP1459 | Plan of the lands of Maryburgh, Brekanord, Lower Kildun and Island More being part of the estate of Brahan | 1847 |
| RHP2922 | Plan and sections of the lands of Maryburgh, Brekanord, Lower Kildun and Island-More, part of the estate of Brahan, showing land reclaimed along the River Conon | 1852 |
| RHP3084 | Plan of the lands of Maryburgh etc, part of the estate of Brahan, Dingwall, Ross and Cromarty | 1852 |
| RHP10545 | Plan of River Conon, Cononbridge and Dingwall | 1832 |
| RHP10546 | Plan of River Conon, Cononbridge and Dingwall | 1832 |
| RHP10547 | Ordnance Survey 6 inch plan Brahan estate | 1901 |
| RHP11593 | Plan of intended road from Dingwall to Ullapool. | 1790 |
| RHP11597 | Plan of intended road from Lochcarron to Achnasheen and thence to Dingwall, Ross and Cromarty | 1793 |
| RHP15022 | Bound plans and sections of proposed branch of the Highland Railway from the Dingwall & Skye Section at Fodderty to Strathpeffer SPA (Railway No 2) | 1884 |
| RHP15621 | Architectural plan and elevation (2 copies) of proposed alterations to Auchterneed Station buildings (London Midland and Scottish Railway): 1921-1923 | 1921-1923 |
| RHP17432 | Plan of Achterneed Station (Dingall and Skye Railway). | 1869 |
| RHP24014 | Plans of area between Tollomuick Forest and Deanich Lodge: | [Early 20th century] |
| RHP24015 | Plans of area between Tollomuick Forest and Deanich Lodge, Fodderty, Ross and Cromarty | Early 20th century |
| RHP28244 | Elevation and section of the Great North of Scotland Railway's bill board at Strathpeffer Spa | c 1910 |
| RHP30494 | Bound plans and sections of proposed deviations of Dingwall and Skye Railway at Ravens' Rock and Achnashellach and of proposed pier at Attadale. (Damaged) | 1867 |
| RHP34689 | Sketch plan of ground planted near Knock Farril. | 1911 |
| RHP34691 | Plan of small holding at [Heights of Fodderty]. | 1940 |
| RHP34694 | Plan of land holding at Heights of Fodderty. | 1926 |
| RHP34709 | Architectural plan, elevation and section of laundry at Fodderty Farm House. | 1868 |
| RHP34710 | Sketch plan of Fodderty Church. | 1865 |
| RHP34718 | Architectural plan and elevation of garage at Strathpeffer. | 20th century |
| RHP34726 | Architectural plan and elevation of Inchvannie Farm. | 1848 |
| RHP34727 | Architectural plan and elevation of forester's house and offices at Blairninich. | 1860 |
| RHP34728 | Architectural plan and elevation (2, attached) of Strathpeffer Post Office. | 20th century |
| RHP34729 | Architectural drawing of Strathpeffer Post Office | 20th century |
| RHP34730 | Architectural sketch plan of hotel at Strathpeffer. | 1866 |
| RHP34731 | Elevations of fences at Strathpeffer Spa. | 1907 |
| RHP34733 | Architectural plan and elevation of lodge at Castle Leod. | Early 19th century |
| RHP34734 | Architectural drawings of additions to Castle Leod | 1904 |
| RHP34735 | Architectural plan and elevation of fire-place in Castle Leod. | 1904 |
| RHP34736 | Architectural plan, elevation and section of coach house at Castle Leod. | 19th century |
| RHP34740 | Plan of feu [for post office], Strathpeffer. | 20th century |
| RHP34741 | Plan of water supply to Strathpeffer from Fountain Head | 1910 |
| RHP34742 | Architectural plan, elevation and section of shelter [at Strathpeffer?]. | 20th century |
| RHP34763 | Architectural plan and elevation of Craig House, Strathpeffer. | 1893 |
| RHP34764 | Bound plan, sections and specification of embankment east of Ravens Rock, Strathpeffer. | 1899 |
| RHP34772 | Tracing plan of field at Fodderty Farm. | 20th century |
| RHP34773 | Architectural plans of urinal and clossets [at Strathpeffer]. | 1887 |
| RHP34774 | Architectural plans of urinal and closets [at Strathpeffer]. | 1887 |
| RHP34780 | Architectural plan, elevation and section of fireplace at [Castle Leod]. | 1906 |
| RHP38311/4 | L.M.S. Railway, Northern Section: Gradient profiles, stations etc. | 1937 |
| RHP38311/5 | L.M.S. Railway, Northern Section: Gradient profiles, stations etc | 1937 |
| RHP41061 | Architectural sketch plan and elevation of addition to carding mill at Ussie (Usie). | 1834 |
| RHP41512 | Plans of lands at Glenskiach and Blairninich proposed to be acquired and used for generating stations by Dingwall and District Electricity | August 1923 |
| RHP42715 | Plan marked to show locus of an assault near Brae Farm. | 22 Jan 1862 |
| RHP44261 | Plan of part of River Conon near Dingwall, marked to show disputed fishings and land belonging to Ferintosh and Seaforth estates. (Damaged) | Late 19th century |
| RHP44262 | Plan of fishings and tidal levels along part of River Conon between Conon and Dingwall. and marked to show dividing line thereto from Ryefield House. | 1832,1868 |
| RHP45175 | Plan of new march between the estates of Coul and Castle Leod. | 7 Jun 1830 |
| RHP45180 | Plan of part of Strathpeffer showing Pump Room and surrounding feus and buildings, the property of Marquis and Marchioness of Stafford. | 1861 |
| RHP45181 | Plan of farm of Keppoch | May 1864 |
| RHP45187 | Plan of part of Dingwall and Skye Railway showing proposed deviation of line by Keppoch, Achterneed and Raven's Rock to Loch Garvie. | March 1867 |
| RHP45188 | Plan of lands of Fodderty Farm, occupied by James Dudgeon, showing line of Dingwall and Skye Railway, with table of acreage of land taken by the Railway. | 12 May 1859 |
| RHP45189 | Sections of proposed new roads in and around Strathpeffer. | 1891 |
| RHP45190 | Plan of new cemetery at Fodderty [never constructed] | 15 May 1896 |
| RHP45191 | Plan of proposed arrangement of sidings for County Council road metal traffic at Ravens Rock (Highland Railway). | 11 May 1914 |
| RHP45198 | Architectural plan of ground floor of Castle Leod. | 1912 |
| RHP45199 | Architectural plan of first floor of Castle Leod. | 1912 |
| RHP45200 | Architectural plan of second floor of old wing, Castle Leod. | 1912 |
| RHP45201 | Architectural plan of third floor [of old wing] of Castle Leod. | 1912 |
| RHP45202 | Architectural plan of fourth floor [of old wing] of Castle Leod. | 1912 |
| RHP45203 | Architectural plan of second floor of new wing of Castle Leod. | 1912 |
| RHP45204 | Architectural front elevation of Castle Leod showing alterations and additions. | March 1904 |
| RHP45205 | Architectural west elevation of Castle Leod showing proposed alterations and additions, with plan showing location of proposed W.C. in east balcony. | March 1904 |
| RHP45206 | Architectural plans and elevations of proposed additions to Gun Room [cottage], Castle Leod. | [early 20th century] |
| RHP45207 | Architectural plan of ground floor [of old wing, Castle Leod]. | 1801 |
| RHP45208 | Architectural plan of third storey [of old wing, Castle Leod]. | 1801 |
| RHP45209 | Architectural plan of fourth storey [of old wing, Castle Leod]. | 1801 |
| RHP45210 | Architectural plan of fifth storey [of old wing, Castle Leod], showing funnel in the wall "for conveying rain water from the roof which keeps the walls of those rooms it passes through quite damp". | 1801 |
| RHP45211 | Architectural plans, sections and details of proposed alterations to ground floor and drawing room floor, Castle Leod. | 7 May 1850 |
| RHP45212 | Architectural east elevation of Castle Leod showing additions. | 15 September 1851 |
| RHP45213 | Architectural plans of ground floor, first floor and roof and east elevation of additions to Castle Leod. | January 1874 |
| RHP45214 | Architectural west and north elevations and sections of additions to Castle Leod. | January 1874 |
| RHP45218 | Architectural drawings of additions to Castle Leod, Fodderty, Ross and Cromarty | Jan 1912 |
| RHP45219 | Architectural north elevation (in pencil) of [proposed additions to] Castle Leod. | 1912 |
| RHP45220 | Architectural elevations and sections (in pencil) of [proposed additions to] Castle Leod. | 1912 |
| RHP45221 | Architectural plan, elevations and section (in pencil) of proposed squash racquet court, Castle Leod for Countess of Cromartie. | March 1914 |
| RHP45222 | Architectural plans, elevations and sections [?contract drawing] of Castle Leod offices. | 1859 |
| RHP45224 | Architectural plans and elevations of Ardivall Farm Steading as proposed to be converted into cottages. | 10 October 1870 |
| RHP45232 | Architectural plans, elevations and section, with detail of septic tank, for proposed bathroom alterations at Balnaird Farm (revised plan of ground floor and revised back elevation attached). | [early 20th century] |
| RHP46369 | Plan of lands proposed to be acquired for generating stations at Blairninich and Fodderty | Aug 1923 |
| RHP46738 | Plan of lands to be feued on estate of Strathpeffer, the property of Duchess of Sutherland and Countess of Cromartie | 1865 |
| RHP48625 | 1. Photocopy of architectural plans, elevations and section of three cottages at Dochcarty on Brae Estate for William Dalziel MacKenzie
2. Photocopy of specification
3. Photocopy of list of estimates | May 1893 |
| RHP48626 | 1. Photocopy of architectural plans, elevations and sections and site plan of two cottages at Dochcarty on Brae Estate for William Dalziel MacKenzie
2. Photocopy of specification
3. Photocopy of list of estimates | Apr 1894 |
| RHP49728 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXVIII) marked to show acreages and land use in Brahan and Moy Woods and around Maryburgh | 20 January 1949 |
| RHP49731 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXVIII) marked to show acreages and types of woodland on Brahan Estate | 17 April 1953 |
| RHP78844 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXVI.NW) marked to show farm boundaries | [1944-1955] |
| RHP78846 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXVI.SW) marked to show farm boundaries | [1944-1955] |
| RHP78847 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXVI.SE) marked to show farm boundaries | [1944-1955] |
| RHP78860 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXVI.NW) marked to show farm boundaries | [1944-1955] |
| RHP79261 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XXXVII) marked to show farm boundaries | [1944-1955] |
| RHP79262 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XXXVIII) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP79272 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet L) marked to show farm boundaries | [1944-1955] |
| RHP79273 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LI) marked to show farm boundaries | [1944-1955] |
| RHP79282 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXII) marked to show farm boundaries | [1944-1955] |
| RHP79283 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXIII) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP79284 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXIV) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP79292 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXV) marked to show farm boundaries | [1944-1955] |
| RHP79301 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXVII) marked to show farm boundaries | [1944-1955] |
| RHP79302 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXVIII) marked to show farm boundaries | [1944-1955] |
| RHP81152 | Plan of farm of Ardivall, with tables of contents as at 1849, 1869 and 1877: 1849 | 1849-1877 |
| RHP82254 | Bound plans and sections of Dingwall and Skye Railway deviations at Raven's Rock and Achnashellach | Nov 1867 |
| RHP82255 | Bound plans and sections of Highland Railway proposed branch railway from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa | Nov 1883 |
| RHP82298 | 1. Bound plans and sections of Dingwall and Skye Railway, proposed deviations at Raven's Rock and Achnashellach and proposed pier at Attadale
2. Book of reference | Nov 1867 |
| RHP82299 | Plans, sections, books of reference and gazette notices of Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1 | Plans and sections of Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/1 | Front cover of plans and sections of Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/2 | Ordnance Survey map marked to show the proposed Highland Railway branch line from Dingwall and Skye Railway to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/3 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/4 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/5 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/6 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/7 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/8 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/9 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/1/10 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/2 | Book of reference and gazette notice for the maps and plans of the new line on the Highlans Railway from Fodderty to Strathpeffer spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3 | Plans and sections of Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/1 | Front cover of plans and sections of Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/2 | Ordnance Survey map marked to show the proposed Highland Railway branch line from Dingwall and Skye Railway to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/3 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/4 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/5 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/6 | Plan of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/7 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/8 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/9 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/3/10 | Section of the Highland Railway branch line from Dingwall and Skye Railway at Fodderty to Strathpeffer Spa, Ross and Cromarty | Nov 1883 |
| RHP82299/4 | Book of reference and gazette notice for the maps and plans of the new line on the Highlans Railway from Fodderty to Strathpeffer spa, Ross and Cromarty | Nov 1883 |
| RHP84467 | Architectural plan and elevations of stationmaster's house at Achterneed in connection with alterations (London Midland and Scottish Railway) | [c 1923] |
| RHP84585 | Architectural plans, elevations and section, with site plan, of proposed alterations and improvements to stationmaster's house at Strathpeffer (London Midland and Scottish Railway) | [c 1923] |
| RHP84713 | Architectural plan of upper floor of stationmaster's house at Strathpeffer in connection with proposed bathroom and hot water supply (London Midland and Scottish Railway) | [c 1923] |
| RHP124820 | Drawing showing elevation, plan sections and details of reconstruction of Docharty Bridge, Achterneed. (London Midland and Scottish Railway) | 1923-1947 |
| RHP128408 | Drawing showing elevation plan and section of Docharty Road Bridge above Achterneed Station (London Midland and Scottish Railway) | 1923-1947 |
| RHP129792 | Hand coloured drawing showing elevations, plan sections and details for renewal of Docharty Bridge at Achterneed (London Midland and Scottish Railway) | 1941 |
| RHP130707 | Details of strengthening of bridge over River Blackwater on Dingwall and Skye Railway (Highland Railway) | Mar 1903 |
| RHP131818 | Elevation, plan and sections of a bridge carrying the A9 road over the railway about half a mile north of Conon Station (London Midland and Scottish Railway) | 1933 |
| RHP140803 | Ordnance Survey [-] plan (Ross and Cromarty sheet [-]) | Early 20th century |
| RHP142356 | Plan of Fodderty burial ground extension, Ross and Cromarty | Feb 1965 |
| RHP142800 | Plan of Brahan estate, Ross and Cromarty | Nov 1784 |
| RHP142801 | Plan of Brahan estate, Ross and Cromarty | 12 Dec 1901 |
| RHP142804 | Plan of Mains of Brahan farm, Brahan estate, Ross and Cromarty | 1787 |
| RHP142805 | Plan of Brahan estate, Ross and Cromarty | 1852 |
| RHP142806 | Plan of Mains farm, Brahan estate, Ross and Cromarty | 24 Jun 1869 |
| RHP142809 | Ordnance Survey 1/2500 plans (Cromartyshire and Nairnshire) | c1892 |
| RHP143400/8/2 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 45 NE | 1960s-1970s |
| RHP143400/8/7 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 55 NW | 1960s-1970s |
| RHP143400/8/8 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 55 NE | 1960s-1970s |
| RHP143400/8/10 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 55 SW | 1960s-1970s |
| RHP143400/8/14 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 56 SW | 1960s-1970s |