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refactoring costing function for solid wall insulation|
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Khalim Conn-Kowlessar
parent
767d0d3132
commit
fe86886adc
2 changed files with 9 additions and 177 deletions
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@ -364,26 +364,9 @@ class Costs:
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"labour_days": labour_days
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}
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def internal_wall_insulation(self, wall_area, material):
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def solid_wall_insulation(self, wall_area, material):
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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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Implements costing methodology now that we have direct quotes from installers.
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:return:
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"""
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@ -638,151 +621,6 @@ class Costs:
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"labour_cost": labour_costs
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}
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def external_wall_insulation(self, wall_area, material, non_insulation_materials):
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"""
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We characterise external wall insulation as the following steps:
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1) Preparation of the Area: Tidying up the surroundings, trimming back foliage, and laying down protective
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sheets to protect the flooring and landscaping around the work area.
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2) Scaffolding Setup (if needed): Erecting scaffolding for safe access to the walls of semi-detached or
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detached houses. For terraced houses or lower-level work, scaffolding might not be necessary.
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3) Wall Surface Preparation: Cleaning the wall surface, removing any loose or flaking material,
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and possibly applying a primer. If the existing wall is weak or damaged, partial or full replacement
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of the top surface may be necessary.
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4) Applying Primer: If the existing wall is suitable, applying a primer to improve adhesion of the insulation
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boards and stabilize the wall surface, especially if it's old or weathered.
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5) Insulation Application: Attaching insulation boards to the primed wall using adhesive, mechanical fixings,
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or a combination of both.
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6) Basecoat and Mesh Application: Applying a basecoat embedded with a reinforcing mesh over the insulation.
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This layer provides strength and helps prevent cracking.
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7) Decorative Finish: Applying a decorative finish, such as render or cladding, which protects the insulation
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and provides an aesthetic look.
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8) Reinstalling Fixtures: Reattaching any fixtures like downpipes, satellite dishes, or lighting fixtures that
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were removed during preparation. Extensions or adjustments may be required due to the increased wall thickness.
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9) Inspection and Cleanup: Conducting a thorough inspection to ensure quality and integrity of the EWI system,
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followed by cleaning up the site to remove all debris and materials.
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In the actual materials data, at this point, we have costing for:
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- wall preparation, hacking off existing wall finishes, linings, etc (ewi_wall_demolition)
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- wall surface cleaning and priming (ewi_wall_preparation)
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- insulation (external_wall_insulation)
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- basecoat and mesh with decorative render topcoat finish (ewi_basecoat_and_mesh)
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All of this data comes from SPONS, however there are some clear features missing. Because we could not find
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suitable cost records in SPONS for steps like cleaning the area, setting up small scale scaffolding,
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re-attaching any fitings and cleaning up the area afterwards, instead we have accounted for these steps by
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increasing the preliminaries rate. It is acknowldeged though, that this is not ideal and that the cost of these
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steps should be included in the materials data. We will look to improve this in the future, with data from
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installers
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:param wall_area:
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:param material:
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:param non_insulation_materials:
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:return:
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"""
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if material["is_installer_quote"]:
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total_cost = material["total_cost"] * wall_area
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# Add on a buffer for scaffolding
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if self.property.data["property-type"] == "House":
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total_cost += self.EWI_SCAFFOLDING_PRELIMINARIES * total_cost
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labour_hours = material["labour_hours_per_unit"] * wall_area
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# To install internal wall insulation, a small to medium size project might be conducted by a team of 3-5
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# people
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labour_days = (labour_hours / 8) / 4
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return {
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"total": total_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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# For semi detatched and detatched houses, as well as maisonettes, we price for scaffolding
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if self.property.data["property-type"] == "House":
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if self.property.data["built-form"] in ['Semi-Detached', 'Detached', "End-Terrace"]:
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preliminaries_rate = self.EWI_SCAFFOLDING_PRELIMINARIES
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else:
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preliminaries_rate = self.EWI_NO_SCAFFOLDING_PRELIMINARIES
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elif self.property.data["property-type"] in ["Maisonette", "Flat"]:
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preliminaries_rate = self.EWI_SCAFFOLDING_PRELIMINARIES
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elif self.property.data["property-type"] == "Bungalow":
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preliminaries_rate = self.EWI_NO_SCAFFOLDING_PRELIMINARIES
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demolition_data = [x for x in non_insulation_materials if x["type"] == "ewi_wall_demolition"]
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preparation_data = [x for x in non_insulation_materials if x["type"] == "ewi_wall_preparation"]
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redecoration_data = [x for x in non_insulation_materials if x["type"] == "ewi_wall_redecoration"]
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if (len(demolition_data) != 3) or (len(preparation_data) != 1) or (len(redecoration_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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preparation_material_costs = preparation_data[0]["material_cost"] * wall_area
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redecoration_material_costs = redecoration_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 = np.mean([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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preparation_labour_costs = preparation_data[0]["labour_cost"] * wall_area
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redecoration_labour_costs = redecoration_data[0]["labour_cost"] * wall_area
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labour_costs = (demolition_labour_costs + insulation_labour_costs + redecoration_labour_costs +
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preparation_labour_costs)
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labour_costs = labour_costs * self.labour_adjustment_factor
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materials_costs = (demolition_material_costs + insulation_material_costs + preparation_material_costs +
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redecoration_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 * preliminaries_rate
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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 = np.mean([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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preparation_labour_hours = preparation_data[0]["labour_hours_per_unit"] * wall_area
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redecoration_labour_hours = redecoration_data[0]["labour_hours_per_unit"] * wall_area
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labour_hours = (demolition_labour_hours + insulation_labour_hours + redecoration_labour_hours +
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preparation_labour_hours)
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# Assume a team of 3-5 people for a small to medium size project
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labour_days = (labour_hours / 8) / 4
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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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"labour_cost": labour_costs
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}
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def low_energy_lighting(self, number_of_lights, number_current_lel_lights, material):
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"""
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@ -172,7 +172,6 @@ class WallRecommendations(Definitions):
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ewi_recommendations = self._find_insulation(
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u_value=u_value,
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insulation_materials=pd.DataFrame(self.external_wall_insulation_materials),
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non_insulation_materials=self.external_wall_non_insulation_materials,
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phase=phase
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)
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@ -437,7 +436,7 @@ class WallRecommendations(Definitions):
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return simulation_config
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def _find_insulation(self, u_value, insulation_materials, non_insulation_materials, phase):
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def _find_insulation(self, u_value, insulation_materials, phase):
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lowest_selected_u_value = None
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recommendations = []
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@ -482,6 +481,11 @@ class WallRecommendations(Definitions):
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lowest_selected_u_value, new_u_value
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)
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cost_result = self.costs.solid_wall_insulation(
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wall_area=self.property.insulation_wall_area,
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material=material.to_dict(),
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)
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if material["type"] == "internal_wall_insulation":
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if iwi_non_invasive_recommendations.get("cost") is not None:
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@ -492,10 +496,6 @@ class WallRecommendations(Definitions):
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sap_points = iwi_non_invasive_recommendations.get("sap_points", None)
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survey = iwi_non_invasive_recommendations.get("survey", False)
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cost_result = self.costs.internal_wall_insulation(
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wall_area=self.property.insulation_wall_area,
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material=material.to_dict(),
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)
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already_installed = (
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"internal_wall_insulation"
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in self.property.already_installed
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@ -511,12 +511,7 @@ class WallRecommendations(Definitions):
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sap_points = ewi_non_invasive_recommendations.get("sap_points", None)
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survey = ewi_non_invasive_recommendations.get("survey", False)
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cost_result = self.costs.external_wall_insulation(
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wall_area=self.property.insulation_wall_area,
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material=material.to_dict(),
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non_insulation_materials=non_insulation_materials,
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)
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already_installed = (
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"external_wall_insulation"
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in self.property.already_installed
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@ -594,7 +589,6 @@ class WallRecommendations(Definitions):
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insulation_materials=pd.DataFrame(
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self.external_wall_insulation_materials
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),
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non_insulation_materials=self.external_wall_non_insulation_materials,
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phase=phase,
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)
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