diff --git a/datatypes/epc/surveys/elmhurst_site_notes.py b/datatypes/epc/surveys/elmhurst_site_notes.py
new file mode 100644
index 00000000..d1fabc73
--- /dev/null
+++ b/datatypes/epc/surveys/elmhurst_site_notes.py
@@ -0,0 +1,235 @@
+from dataclasses import dataclass
+from datetime import date
+from typing import List, Optional
+
+
+@dataclass
+class SurveyorInfo:
+    surveyor_code: str
+    name: str
+    title: str
+    tel_number: str
+    survey_reference: str
+    my_reference: Optional[str] = None
+
+
+@dataclass
+class PropertyDetails:
+    rdsap_version: str
+    reference_number: str
+    lodgement_required: bool
+    regs_region: str
+    epc_language: str
+    postcode: str
+    region: str
+    street: str
+    town: str
+    tenure: str
+    transaction_type: str
+    inspection_date: date
+    process_date: date
+    epc_exists: bool
+    uprn: Optional[str] = None
+    house_name: Optional[str] = None
+    house_number: Optional[str] = None
+    locality: Optional[str] = None
+    county: Optional[str] = None
+
+
+@dataclass
+class FloorDimension:
+    name: str  # e.g. "Lowest Floor"
+    area_m2: float
+    room_height_m: float
+    heat_loss_perimeter_m: float
+    party_wall_length_m: float
+
+
+@dataclass
+class BuildingPartDimensions:
+    dimension_type: str  # e.g. "Internal"
+    floors: List[FloorDimension]
+
+
+@dataclass
+class WallDetails:
+    wall_type: str           # e.g. "CA Cavity"
+    insulation: str          # e.g. "F Filled Cavity"
+    thickness_unknown: bool
+    u_value_known: bool
+    party_wall_type: str     # e.g. "U Unable to determine"
+    thickness_mm: Optional[int] = None
+
+
+@dataclass
+class RoofDetails:
+    roof_type: str           # e.g. "PA Pitched (slates/tiles), access to loft"
+    insulation: str          # e.g. "J Joists"
+    u_value_known: bool
+    insulation_thickness_mm: Optional[int] = None
+
+
+@dataclass
+class FloorDetails:
+    location: str            # e.g. "G Ground floor"
+    floor_type: str          # e.g. "N Suspended, not timber"
+    insulation: str          # e.g. "A As built"
+    u_value_known: bool
+    default_u_value: Optional[float] = None
+
+
+@dataclass
+class Window:
+    width_m: float
+    height_m: float
+    area_m2: float
+    glazing_type: str
+    frame_factor: float
+    building_part: str
+    location: str
+    orientation: str
+    data_source: str
+    u_value: float
+    g_value: float
+    draught_proofed: bool
+    permanent_shutters: str  # e.g. "None"
+    frame_type: Optional[str] = None
+    glazing_gap: Optional[str] = None
+
+
+@dataclass
+class VentilationAndCooling:
+    open_chimneys_count: int
+    open_flues_count: int
+    open_chimneys_closed_fire_count: int
+    solid_fuel_boiler_flues_count: int
+    other_heater_flues_count: int
+    blocked_chimneys_count: int
+    extract_fans_count: int
+    passive_vents_count: int
+    flueless_gas_fires_count: int
+    fixed_space_cooling: bool
+    draught_lobby: str       # e.g. "Not present"
+    mechanical_ventilation: bool
+    pressure_test_method: str  # e.g. "Not available"
+
+
+@dataclass
+class Lighting:
+    total_bulbs: int
+    led_cfl_count_known: bool
+    led_count: int
+    cfl_count: int
+    incandescent_count: int
+
+
+@dataclass
+class MainHeating:
+    heat_emitter: str        # e.g. "Radiators"
+    fuel_type: str           # e.g. "Mains gas"
+    flue_type: str           # e.g. "Balanced"
+    fan_assisted_flue: bool
+    design_flow_temperature: str  # e.g. "Unknown"
+    heating_controls_ees: str     # e.g. "CBE"
+    heating_controls_sap: str     # e.g. "SAP code 2106, Programmer, room thermostat and TRVs"
+    percentage_of_heat: int
+    pcdf_boiler_reference: Optional[str] = None  # e.g. "17742 Potterton, Promax 33 Combi ErP, 88.30%"
+    heat_pump_age: Optional[str] = None
+
+
+@dataclass
+class Meters:
+    electricity_meter_type: str  # e.g. "Single"
+    main_gas: bool
+    electricity_smart_meter: bool
+    gas_smart_meter: bool
+
+
+@dataclass
+class WaterHeating:
+    water_heating_code: str   # e.g. "HWP"
+    water_heating_sap_code: int
+    water_heating_fuel_type: str
+    hot_water_cylinder_present: bool
+
+
+@dataclass
+class Shower:
+    shower_number: int
+    outlet_type: str
+    connected: str            # e.g. "None"
+
+
+@dataclass
+class BathsAndShowers:
+    number_of_baths: int
+    number_of_baths_connected: int
+    showers: List[Shower]
+
+
+@dataclass
+class Renewables:
+    solar_water_heating: bool
+    wwhrs_present: bool
+    flue_gas_heat_recovery_present: bool
+    photovoltaic_panel: str   # e.g. "None"
+    export_capable_meter: bool
+    wind_turbine_present: bool
+    wind_turbines_terrain_type: str
+    hydro_electricity_generated_kwh: float
+
+
+@dataclass
+class ElmhurstSiteNotes:
+    surveyor_info: SurveyorInfo
+    property_details: PropertyDetails
+
+    # Section 1.0
+    property_type: str        # e.g. "B Bungalow"
+    attachment: str           # e.g. "E End-Terrace"
+
+    # Section 2.0
+    number_of_storeys: int
+    habitable_rooms: int
+    heated_habitable_rooms: int
+
+    # Section 3.0
+    construction_age_band: str  # e.g. "D 1950-1966"
+
+    # Section 4.0
+    dimensions: BuildingPartDimensions
+
+    # Section 5.0
+    has_conservatory: bool
+
+    # Sections 7.0–9.0
+    walls: WallDetails
+    roof: RoofDetails
+    floor: FloorDetails
+
+    # Section 10.0
+    door_count: int
+    insulated_door_count: int
+
+    # Section 11.0
+    windows: List[Window]
+    draught_proofing_percent: int
+
+    # Section 12.0
+    ventilation: VentilationAndCooling
+
+    # Section 13.0
+    lighting: Lighting
+
+    # Section 14.0–14.2
+    main_heating: MainHeating
+    meters: Meters
+
+    # Section 15.0
+    water_heating: WaterHeating
+
+    # Section 1x.0
+    baths_and_showers: BathsAndShowers
+
+    # Sections 16.0–22.0
+    renewables: Renewables