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implemented internal_wall_insulation cost method
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Khalim Conn-Kowlessar
parent
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commit
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1 changed files with 213 additions and 11 deletions
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@ -1,3 +1,6 @@
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import numpy as np
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class Costs:
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"""
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A class to calculate the costs associated with construction works,
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@ -38,17 +41,19 @@ class Costs:
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:return: A dictionary containing detailed cost breakdown.
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"""
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# Cost per m2
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material = {
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"description": "Crown Dritherm Cavity Slab 37 (Thermal conductivity 0.037 W/mK) glass fibre batt or other "
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"equal; as full or partial cavity fill; including cutting and fitting around wall ties and "
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"retaining discs",
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"depth": 75,
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"thermal_conductivity": 0.037,
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"prime_cost": 5.17,
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"material_cost": 5.62,
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"labour_cost": 2.25,
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"labour_hours": 0.13
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}
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# material = {
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# "description": "Crown Dritherm Cavity Slab 37 (Thermal conductivity 0.037 W/mK) glass fibre batt or
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# other "
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# "equal; as full or partial cavity fill; including cutting and fitting around wall ties
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# and "
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# "retaining discs",
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# "depth": 75,
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# "thermal_conductivity": 0.037,
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# "prime_cost": 5.17,
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# "material_cost": 5.62,
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# "labour_cost": 2.25,
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# "labour_hours": 0.13
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# }
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material_cost_per_m2 = material["material_cost"]
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wall_area = self.property.insulation_wall_area
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@ -132,3 +137,200 @@ class Costs:
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"profit": profit_cost,
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"labour_hours": labour_hours
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}
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def internal_wall_insulation(self, material, non_insulation_materials):
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"""
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Broadly speaking, the high level steps to an internal wall insulation job are the following:
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1) Demolition: This involves removing existing wall linings, fittings, and any other obstacles.
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It's important to factor in the disposal of debris and the potential need for additional protective
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measures to ensure the safety of the work area.
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2) Insulation Installation: This is the core part of the process where the chosen insulation material is
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applied. The choice of insulation material will depend on several factors including thermal performance,
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wall construction, and space constraints.
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3) Vapour Barrier Installation: This is crucial for preventing moisture from penetrating the insulation,
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which can compromise its effectiveness and lead to mold growth.
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4) Re-decoration: This involves applying plaster to the wall and then painting.
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The quality of finish here is important for both aesthetic and functional reasons.
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5) Trim and Finishing Work: Post-insulation, tasks such as re-installing skirting boards, door frames,
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or window sills might be necessary.
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:return:
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"""
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# Parsing the provided table into a list of dictionaries
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# non_insulation_materials = [
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# {'type': 'iwi_wall_demolition',
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# 'description': 'Solid & Dry Lined walls: Hack of wall finishes with chipping hammer; plaster to walls.',
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# 'depth': 0.0, 'depth_unit': 0.0, 'cost_unit': 'gbp_per_m2', 'thermal_conductivity': 0.0,
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# 'thermal_conductivity_unit': 0.0, 'prime_material_cost': 0.0, 'material_cost': 0.0, 'labour_cost': 10.27,
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# 'labour_hours_per_unit': 0.33, 'plant_cost': 1.28, 'total_cost': 11.55, 'link': 'SPONs', 'Notes': 0.0},
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# {'type': 'iwi_wall_demolition',
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# 'description': 'Stud walls: Remove wall linings including battening behind; plasterboard and skim',
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# 'depth': 0.0, 'depth_unit': 0.0, 'cost_unit': 'gbp_per_m2', 'thermal_conductivity': 0.0,
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# 'thermal_conductivity_unit': 0.0, 'prime_material_cost': 0.0, 'material_cost': 0.0, 'labour_cost': 6.23,
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# 'labour_hours_per_unit': 0.2, 'plant_cost': 1.25, 'total_cost': 7.48, 'link': 'SPONs', 'Notes': 0.0},
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# {'type': 'iwi_wall_demolition',
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# 'description': 'Lathe and Plaster walls: Remove wall linings including battening behind; wood lath and '
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# 'plaster',
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# 'depth': 0.0, 'depth_unit': 0.0, 'cost_unit': 'gbp_per_m2', 'thermal_conductivity': 0.0,
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# 'thermal_conductivity_unit': 0.0, 'prime_material_cost': 0.0, 'material_cost': 0.0, 'labour_cost': 6.85,
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# 'labour_hours_per_unit': 0.22, 'plant_cost': 2.09, 'total_cost': 8.94, 'link': 'SPONs', 'Notes': 0.0},
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# {'Notes': "",
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# 'cost_unit': "",
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# 'depth': "",
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# 'depth_unit': "",
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# 'description': 'Visqueen High Performance Vapour Barrier',
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# 'labour_cost': 0.48,
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# 'labour_hours_per_unit': 0.02,
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# 'link': 'SPONs',
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# 'material_cost': 1.21,
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# 'plant_cost': 0,
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# 'prime_material_cost': 0.58,
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# 'thermal_conductivity': "",
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# 'thermal_conductivity_unit': "",
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# 'total_cost': 1.69,
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# 'type': 'iwi_vapour_barrier'},
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# {'Notes': "",
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# 'cost_unit': "",
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# 'depth': "",
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# 'depth_unit': "",
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# 'description': 'Plaster; one coat Thistle board finish or other equal; steel trowelled; 3 mm thick work '
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# 'to walls or ceilings; one coat; to plasterboard base; over 600mm wide',
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# 'labour_cost': 6.58,
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# 'labour_hours_per_unit': 0.25,
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# 'link': "",
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# 'material_cost': 0.06,
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# 'plant_cost': 0,
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# 'prime_material_cost': 0.0,
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# 'thermal_conductivity': "",
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# 'thermal_conductivity_unit': "",
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# 'total_cost': 6.64,
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# 'type': 'iwi_redecoration'},
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# {'Notes': "",
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# 'cost_unit': "",
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# 'depth': "",
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# 'depth_unit': "",
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# 'description': 'Two coats emulsion paint on plaster, over 40mm girth; 3.5m - '
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# '5m high',
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# 'labour_cost': 0.0,
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# 'labour_hours_per_unit': 0.21,
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# 'link': "",
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# 'material_cost': 0.41,
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# 'plant_cost': 0,
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# 'prime_material_cost': "",
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# 'thermal_conductivity': "",
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# 'thermal_conductivity_unit': "",
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# 'total_cost': 4.34,
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# 'type': 'iwi_redecoration'},
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# {'Notes': "",
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# 'cost_unit': "",
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# 'depth': "",
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# 'depth_unit': "",
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# 'description': 'Fitting existing softwood skirting or architrave to new '
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# 'frames; 150mm high',
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# 'labour_cost': 4.87,
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# 'labour_hours_per_unit': 0.01,
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# 'link': "",
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# 'material_cost': 4.86,
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# 'plant_cost': 0,
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# 'prime_material_cost': "",
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# 'thermal_conductivity': "",
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# 'thermal_conductivity_unit': "",
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# 'total_cost': 4.88,
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# 'type': 'iwi_finishes'}
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# ]
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#
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# material = {
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# "type": "internal_wall_insulation",
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# "description": "Ecotherm Eco-Versal PIR Insulation Board",
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# "depth": 150,
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# "depth_unit": "mm",
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# "cost_unit": "gbp_per_m2",
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# "thermal_conductivity": 0.022,
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# "thermal_conductivity_unit": "watt_per_meter_kelvin",
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# "prime_material_cost": "",
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# "material_cost": 11.68,
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# "labour_cost": 3.12,
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# "labour_hours_per_unit": 0.18,
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# "plant_cost": "",
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# "total_cost": 14.8,
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# "link": "SPONs"
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# }
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# Cost per m2
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wall_area = self.property.insulation_wall_area
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# Extract and check the different types of data we'll need
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demolition_data = [x for x in non_insulation_materials if x["type"] == "iwi_wall_demolition"]
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vapour_barrier_data = [x for x in non_insulation_materials if x["type"] == "iwi_vapour_barrier"]
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redecoration_data = [x for x in non_insulation_materials if x["type"] == "iwi_redecoration"]
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finishes_data = [x for x in non_insulation_materials if x["type"] == "iwi_finishes"]
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if not demolition_data:
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raise ValueError("No data found for iwi_wall_demolition")
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if (len(vapour_barrier_data) != 1) or (len(redecoration_data) != 2) or (len(finishes_data) != 1):
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raise ValueError("Incorrect number of data entries for non-insulation materials")
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# Break out the individual material costs
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# Since we don't know the exact wall construction, we take an average for demolition costs, since
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# the cost will depend on the type of wall construction
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demolition_material_costs = np.mean([x["material_cost"] * wall_area for x in demolition_data])
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insulation_material_costs = material["material_cost"] * wall_area
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vapour_barrier_material_costs = vapour_barrier_data[0]["material_cost"] * wall_area
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redecoration_material_costs = sum([x["material_cost"] * wall_area for x in redecoration_data])
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finishes_material_costs = finishes_data[0]["material_cost"] * wall_area
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demolition_plant_costs = np.mean([x["plant_cost"] * wall_area for x in demolition_data])
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demolition_labour_costs = sum([x["labour_cost"] * wall_area for x in demolition_data])
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insulation_labour_costs = material["labour_cost"] * wall_area
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vapour_barrier_labour_costs = vapour_barrier_data[0]["labour_cost"] * wall_area
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redecoration_labour_costs = sum([x["labour_cost"] * wall_area for x in redecoration_data])
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finishes_labour_costs = finishes_data[0]["labour_cost"] * wall_area
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labour_costs = (demolition_labour_costs + insulation_labour_costs + vapour_barrier_labour_costs +
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redecoration_labour_costs + finishes_labour_costs)
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materials_costs = (demolition_material_costs + insulation_material_costs + vapour_barrier_material_costs +
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redecoration_material_costs + finishes_material_costs)
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subtotal_before_profit = labour_costs + materials_costs + demolition_plant_costs
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contingency_cost = subtotal_before_profit * self.CONTINGENCY
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preliminaries_cost = subtotal_before_profit * self.PRELIMINARIES
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profit_cost = subtotal_before_profit * self.PROFIT_MARGIN
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subtotal_before_vat = subtotal_before_profit + contingency_cost + preliminaries_cost + profit_cost
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vat_cost = subtotal_before_vat * self.VAT_RATE
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total_cost = subtotal_before_vat + vat_cost
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demolition_labour_hours = sum([x["labour_hours_per_unit"] * wall_area for x in demolition_data])
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insulation_labour_hours = material["labour_hours_per_unit"] * wall_area
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vapour_barrier_labour_hours = vapour_barrier_data[0]["labour_hours_per_unit"] * wall_area
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redecoration_labour_hours = sum([x["labour_hours_per_unit"] * wall_area for x in redecoration_data])
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finishes_labour_hours = finishes_data[0]["labour_hours_per_unit"] * wall_area
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labour_hours = (demolition_labour_hours + insulation_labour_hours + vapour_barrier_labour_hours +
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redecoration_labour_hours + finishes_labour_hours)
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# To install internal wall insulation, a small to medium size project might be conducted by a team of 3-5 people
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labour_days = (labour_hours / 8) / 5
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return {
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"total": total_cost,
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"subtotal": subtotal_before_vat,
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"vat": vat_cost,
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"contingency": contingency_cost,
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"preliminaries": preliminaries_cost,
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"material": materials_costs,
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"profit": profit_cost,
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"labour_hours": labour_hours,
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"labour_days": labour_days
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}
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