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class=\"et_pb_column et_pb_column_2_3 et_pb_column_2_tb_body  et_pb_css_mix_blend_mode_passthrough\">\n\u003Cdiv class=\"et_pb_module et_pb_post_content et_pb_post_content_0_tb_body\">\n\u003Ch3 data-section-id=\"1n79fe9\" data-start=\"615\" data-end=\"636\">Project details\u003C\u002Fh3>\n\u003Cp data-start=\"637\" data-end=\"1071\">Service: overglazed extensions calculations\u003Cbr data-start=\"680\" data-end=\"683\">Client: Private homeowner \u002F residential design & build contractor\u003Cbr data-start=\"748\" data-end=\"751\">Project: Rear and side kitchen extension with high glazing ratio and rooflights\u003Cbr data-start=\"830\" data-end=\"833\">Location: Richmond, London TW10 \u003Cbr data-start=\"898\" data-end=\"901\">Regulation driver: Building Regulations Part L (energy efficiency compliance)\u003Cbr data-start=\"978\" data-end=\"981\">ATSPACE team: Building energy compliance consultants, overheating and Part L specialists\u003C\u002Fp>\n\u003Ch3 data-section-id=\"fgn2hc\" data-start=\"1073\" data-end=\"1098\">The headline result\u003C\u002Fh3>\n\u003Cp data-start=\"1100\" data-end=\"1278\">ATSPACE delivered Part L compliance for an overglazed extension without requiring any redesign, achieving first time approval and avoiding delays to the construction programme.\u003C\u002Fp>\n\u003Cp data-start=\"1280\" data-end=\"1607\">The project involved a highly glazed rear and side kitchen extension, including large sliding doors and multiple rooflights. Despite the increased heat loss and gain risk associated with high glazing levels, ATSPACE demonstrated compliance through detailed overglazed extensions calculations aligned with Part L requirements.\u003C\u002Fp>\n\u003Cp data-start=\"1609\" data-end=\"1947\">ATSPACE delivered:\u003Cbr data-start=\"1627\" data-end=\"1630\">Energy compliance review of extension design\u003Cbr data-start=\"1674\" data-end=\"1677\">Overglazed extensions calculations for Part L compliance\u003Cbr data-start=\"1733\" data-end=\"1736\">Assessment of glazing performance and thermal efficiency\u003Cbr data-start=\"1792\" data-end=\"1795\">Practical improvement recommendations without redesign\u003Cbr data-start=\"1849\" data-end=\"1852\">Building Control-ready compliance documentation\u003Cbr data-start=\"1899\" data-end=\"1902\">First time approval with no programme delay\u003C\u002Fp>\n\u003Ch3 data-section-id=\"12t9m4w\" data-start=\"1949\" data-end=\"1971\">Project overview\u003C\u002Fh3>\n\u003Cp data-start=\"1973\" data-end=\"2244\">This project involved a domestic rear and side kitchen extension to a detached property in South West London. The design focused on creating a bright, open-plan kitchen and dining space with strong connections to the garden through large glazed openings and rooflights.\u003C\u002Fp>\n\u003Cp data-start=\"2246\" data-end=\"2547\">While the architectural intent was clear, the level of glazing introduced challenges under \u003Cstrong data-start=\"2337\" data-end=\"2375\">Part L of the Building Regulations\u003C\u002Fstrong>, which focuses on energy efficiency and thermal performance. High glazing ratios can increase heat loss in winter, impacting overall building performance and compliance.\u003C\u002Fp>\n\u003Cp data-start=\"2549\" data-end=\"2834\">ATSPACE was appointed during the technical design stage to complete overglazed extensions calculations to confirm Part L compliance before submission to Building Control. The key requirement was to ensure the extension could proceed without redesign, delay or loss of design quality.\u003C\u002Fp>\n\u003Cp data-start=\"2836\" data-end=\"2962\">The challenge was to balance energy performance requirements with the client’s desire for a highly glazed, modern extension.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"139icz0\" data-start=\"2964\" data-end=\"2993\">Why the service matters\u003C\u002Fh3>\n\u003Cp data-start=\"2995\" data-end=\"3194\">Overglazed extensions calculations for Part L compliance assess whether a domestic extension meets energy efficiency standards when high levels of glazing are introduced into the building envelope.\u003C\u002Fp>\n\u003Cp data-start=\"3196\" data-end=\"3425\">Part L of the Building Regulations ensures that buildings are designed to reduce heat loss, improve thermal efficiency and minimise energy demand. In extensions, glazing is one of the most critical factors affecting compliance.\u003C\u002Fp>\n\u003Cp data-start=\"3427\" data-end=\"3687\">This service is typically required for:\u003Cbr data-start=\"3466\" data-end=\"3469\">Domestic kitchen extensions with large glazing areas\u003Cbr data-start=\"3521\" data-end=\"3524\">Side-return and rear extensions with rooflights\u003Cbr data-start=\"3571\" data-end=\"3574\">Designs using full-height sliding or bifold doors\u003Cbr data-start=\"3623\" data-end=\"3626\">Energy compliance submissions for Building Control approval\u003C\u002Fp>\n\u003Cp data-start=\"3689\" data-end=\"3933\">The calculations ensure that:\u003Cbr data-start=\"3718\" data-end=\"3721\">Heat loss through glazing is controlled\u003Cbr data-start=\"3760\" data-end=\"3763\">Fabric performance meets regulatory requirements\u003Cbr data-start=\"3811\" data-end=\"3814\">Energy efficiency targets are achieved\u003Cbr data-start=\"3852\" data-end=\"3855\">The extension does not negatively impact the existing dwelling’s performance\u003C\u002Fp>\n\u003Cp data-start=\"3935\" data-end=\"4131\">If overglazed extensions calculations are not completed early, projects may face redesign requirements, rejection by Building Control, or costly changes to glazing specification at a late stage.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"11s12pg\" data-start=\"4133\" data-end=\"4150\">The problem\u003C\u002Fh3>\n\u003Cp data-start=\"4152\" data-end=\"4437\">The proposed extension included extensive glazing across both rear and side elevations, as well as multiple rooflights. While this created a high-quality architectural design with excellent daylighting, it also increased the risk of failing Part L compliance due to higher heat loss.\u003C\u002Fp>\n\u003Cp data-start=\"4439\" data-end=\"4757\">Key issues identified included:\u003Cbr data-start=\"4470\" data-end=\"4473\">High proportion of glazing compared to solid wall areas\u003Cbr data-start=\"4528\" data-end=\"4531\">Limited insulation improvement opportunities in existing structure\u003Cbr data-start=\"4597\" data-end=\"4600\">Rooflights increasing overall thermal loss\u003Cbr data-start=\"4642\" data-end=\"4645\">Uncertainty around glazing specification performance values\u003Cbr data-start=\"4704\" data-end=\"4707\">No initial energy compliance modelling completed\u003C\u002Fp>\n\u003Cp data-start=\"4759\" data-end=\"4930\">The project also had a strict requirement to avoid redesign, meaning any compliance solution needed to work within the existing architectural layout and glazing concept.\u003C\u002Fp>\n\u003Cp data-start=\"4932\" data-end=\"5086\">Without intervention, there was a risk that the extension would fail Part L requirements, resulting in delays and potential redesign of glazing systems.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"jlughc\" data-start=\"5088\" data-end=\"5122\">What ATSPACE was asked to do\u003C\u002Fh3>\n\u003Cp data-start=\"5124\" data-end=\"5519\">Carry out overglazed extensions calculations for Part L compliance\u003Cbr data-start=\"5190\" data-end=\"5193\">Assess energy performance impact of proposed glazing design\u003Cbr data-start=\"5252\" data-end=\"5255\">Review thermal efficiency of building envelope\u003Cbr data-start=\"5301\" data-end=\"5304\">Identify compliance risks early in the design process\u003Cbr data-start=\"5357\" data-end=\"5360\">Provide practical mitigation options without redesign\u003Cbr data-start=\"5413\" data-end=\"5416\">Support Building Control submission requirements\u003Cbr data-start=\"5464\" data-end=\"5467\">Deliver compliant energy performance documentation\u003C\u002Fp>\n\u003Ch3 data-section-id=\"bmbyk8\" data-start=\"5521\" data-end=\"5539\">Our approach\u003C\u002Fh3>\n\u003Cp data-start=\"5541\" data-end=\"5852\">Step 1: Understanding the compliance requirement\u003Cbr data-start=\"5589\" data-end=\"5592\">ATSPACE confirmed that the project required compliance with Part L due to the extent of new glazing introduced by the extension. Overglazed extensions calculations were required to assess energy performance impact and ensure compliance could be demonstrated.\u003C\u002Fp>\n\u003Cp data-start=\"5854\" data-end=\"6150\">Step 2: Reviewing design and thermal assumptions\u003Cbr data-start=\"5902\" data-end=\"5905\">We reviewed architectural drawings, glazing specifications, rooflight placements and thermal assumptions. This allowed us to assess heat loss risk and identify areas where performance improvements could be achieved without altering the design.\u003C\u002Fp>\n\u003Cp data-start=\"6152\" data-end=\"6545\">Step 3: Practical energy efficiency recommendations\u003Cbr data-start=\"6203\" data-end=\"6206\">Before final calculations, ATSPACE provided practical advice to improve compliance outcomes, including:\u003Cbr data-start=\"6309\" data-end=\"6312\">Optimising glazing specification (low-e performance improvements)\u003Cbr data-start=\"6377\" data-end=\"6380\">Reviewing rooflight thermal values to reduce heat loss\u003Cbr data-start=\"6434\" data-end=\"6437\">Improving overall fabric performance assumptions\u003Cbr data-start=\"6485\" data-end=\"6488\">Balancing glazing distribution to reduce thermal impact\u003C\u002Fp>\n\u003Cp data-start=\"6547\" data-end=\"6650\">These recommendations were designed to maintain the design intent while improving energy performance.\u003C\u002Fp>\n\u003Cp data-start=\"6652\" data-end=\"6948\">Step 4: Clear Part L compliance reporting\u003Cbr data-start=\"6693\" data-end=\"6696\">ATSPACE completed overglazed extensions calculations and produced a structured Part L compliance report. The documentation demonstrated that the extension met all relevant energy efficiency requirements and was suitable for Building Control approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"176e6rf\" data-start=\"6950\" data-end=\"6999\">Real issues we faced and how we solved them\u003C\u002Fh3>\n\u003Cp data-start=\"7001\" data-end=\"7264\">Issue A: High glazing-to-wall ratio\u003Cbr data-start=\"7036\" data-end=\"7039\">The design heavily favoured glazing over solid wall construction.\u003Cbr data-start=\"7104\" data-end=\"7107\">How ATSPACE helped:\u003Cbr data-start=\"7126\" data-end=\"7129\">We assessed thermal impact and recommended glazing specification improvements to offset heat loss without altering the design layout.\u003C\u002Fp>\n\u003Cp data-start=\"7266\" data-end=\"7496\">Issue B: Rooflight thermal performance concerns\u003Cbr data-start=\"7313\" data-end=\"7316\">Multiple rooflights increased overall energy loss.\u003Cbr data-start=\"7366\" data-end=\"7369\">How ATSPACE helped:\u003Cbr data-start=\"7388\" data-end=\"7391\">We refined performance assumptions and advised on specification upgrades to improve thermal efficiency.\u003C\u002Fp>\n\u003Cp data-start=\"7498\" data-end=\"7754\">Issue C: Limited fabric upgrade scope\u003Cbr data-start=\"7535\" data-end=\"7538\">The existing structure limited opportunities for insulation improvements.\u003Cbr data-start=\"7611\" data-end=\"7614\">How ATSPACE helped:\u003Cbr data-start=\"7633\" data-end=\"7636\">We optimised calculation inputs and focused on glazing performance to achieve compliance without structural changes.\u003C\u002Fp>\n\u003Cp data-start=\"7756\" data-end=\"8003\">Issue D: Need for no redesign solution\u003Cbr data-start=\"7794\" data-end=\"7797\">The client required compliance without altering the architectural design.\u003Cbr data-start=\"7870\" data-end=\"7873\">How ATSPACE helped:\u003Cbr data-start=\"7892\" data-end=\"7895\">We developed a compliance strategy focused on material performance adjustments rather than design changes.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1j6c1zw\" data-start=\"8005\" data-end=\"8018\">Results\u003C\u002Fh3>\n\u003Cp data-start=\"8020\" data-end=\"8323\">Part L compliance achieved first time\u003Cbr data-start=\"8057\" data-end=\"8060\">No redesign required to glazing or layout\u003Cbr data-start=\"8101\" data-end=\"8104\">Building Control approval secured without delay\u003Cbr data-start=\"8151\" data-end=\"8154\">Overglazed extensions calculations accepted\u003Cbr data-start=\"8197\" data-end=\"8200\">Energy efficiency requirements fully satisfied\u003Cbr data-start=\"8246\" data-end=\"8249\">Client retained original design intent\u003Cbr data-start=\"8287\" data-end=\"8290\">Programme delivered on schedule\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1bmn0eq\" data-start=\"8325\" data-end=\"8355\">What this project proves\u003C\u002Fh3>\n\u003Cp data-start=\"8357\" data-end=\"8534\">This project demonstrates that Part L compliance can be achieved even in highly glazed extensions when overglazed extensions calculations are carried out early and accurately.\u003C\u002Fp>\n\u003Cp data-start=\"8536\" data-end=\"8682\">Energy compliance is not just a regulatory hurdle, it is a design optimisation tool that allows projects to balance aesthetics with performance.\u003C\u002Fp>\n\u003Cp data-start=\"8684\" data-end=\"8885\">When managed properly, it enables teams to:\u003Cbr data-start=\"8727\" data-end=\"8730\">Retain modern glazed design features\u003Cbr data-start=\"8766\" data-end=\"8769\">Avoid costly redesigns\u003Cbr data-start=\"8791\" data-end=\"8794\">Meet Building Regulations efficiently\u003Cbr data-start=\"8831\" data-end=\"8834\">Deliver energy-efficient homes without compromise\u003C\u002Fp>\n\u003Cp data-start=\"8887\" data-end=\"8989\">Early assessment is key to avoiding compliance issues and ensuring smooth Building Control approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"icdteb\" data-start=\"8991\" data-end=\"9005\">Mini FAQ\u003C\u002Fh3>\n\u003Cp data-start=\"9007\" data-end=\"9211\">What are overglazed extensions calculations for Part L?\u003Cbr data-start=\"9062\" data-end=\"9065\">They are assessments used to determine whether a glazed extension meets energy efficiency requirements under Part L of the Building Regulations.\u003C\u002Fp>\n\u003Cp data-start=\"9213\" data-end=\"9371\">Do all extensions need Part L calculations?\u003Cbr data-start=\"9256\" data-end=\"9259\">Most extensions require some level of energy compliance assessment, especially those with significant glazing.\u003C\u002Fp>\n\u003Cp data-start=\"9373\" data-end=\"9538\">Why is glazing important in Part L compliance?\u003Cbr data-start=\"9419\" data-end=\"9422\">Glazing typically has higher heat loss than insulated walls, which can affect overall building energy performance.\u003C\u002Fp>\n\u003Cp data-start=\"9540\" data-end=\"9697\">Can I have a fully glazed extension and still comply?\u003Cbr data-start=\"9593\" data-end=\"9596\">Yes, compliance is possible with the right glazing specifications and thermal performance strategy.\u003C\u002Fp>\n\u003Cp data-start=\"9699\" data-end=\"9830\">When should Part L calculations be done?\u003Cbr data-start=\"9739\" data-end=\"9742\">They should be completed during the design stage to avoid redesign or approval delays.\u003C\u002Fp>\n\u003Cp data-start=\"9832\" data-end=\"9981\">Can ATSPACE help if design is already fixed?\u003Cbr data-start=\"9876\" data-end=\"9879\">Yes, ATSPACE specialises in achieving compliance without requiring design changes wherever possible.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"gdtiox\" data-start=\"9983\" data-end=\"10003\">Call to action\u003C\u002Fh3>\n\u003Cp data-start=\"10005\" data-end=\"10079\">Need help with overglazed extensions calculations for Part L compliance?\u003C\u002Fp>\n\u003Cp data-start=\"10081\" data-end=\"10273\" data-is-last-node=\"\" data-is-only-node=\"\">ATSPACE helps homeowners, contractors and designers achieve fast, reliable energy compliance without redesign delays. Send your project details and we will confirm requirements and next steps\u003C\u002Fp>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>","py-7","px-5","2026-04-30T10:59:05.000000Z","2026-04-30T11:09:12.000000Z",{"id":160,"user_id":245,"parent_id":7,"page_type_id":7,"linked_page_id":7,"title":246,"slug":247,"full_url":248,"live":11,"data_model":249,"created_at":250,"updated_at":250,"text_content_only":251,"html_content_only":251,"is_homepage":8,"is_template":8,"is_password_protected":8,"page_password":7,"parent":7},1,"Case 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