AT4.2 Urban Building Integration Sample Model Answer

For information and reference only – not to be submitted as your own work.

This extract shows how the written and annotation content of an AT4.2 Urban Building integration submission can be pitched at Stage 4. It uses an invented eight-storey mixed-use building (shops and workspace at the base, flats above) on an imaginary urban corner plot, so every figure below is illustrative and none of it describes a real project. If you are working in architecture or construction more widely, our architecture assignment help page shows the other subjects we support. For the reasoning behind each choice, read the companion article on how to approach AT4.2 Urban Building integration.

What this sample covers

The AT4.2 component asks you to test and evaluate architectural technology knowledge inside your studio design, not in a separate exercise. A marker therefore reads your drawings and your short text together. The table maps each deliverable to the section of this extract that models it. Page counts are an illustrative split of a 12 x A3 limit.

The physical models (prototype and final) sit alongside the PDF. Photograph them and refer to them in the text, as the extract does.

Model-answer extract

Position statement

The building argues that a dense urban corner can be warm, quiet and low in carbon without hiding its construction. A hybrid frame of glulam columns, cross-laminated timber (CLT) floors and a reinforced concrete stability core is left visible in the workspace floors and lined in the flats. The façade is a ventilated brick-slip rainscreen at street level, changing to timber-framed panels with metal-clad reveals above.

Three technology ideas follow from that position. First, the structure sets the interior, so the frame grid (7.5 m by 6.0 m) was fixed before the plan was resolved. Second, the envelope is treated as a performance layer first and an image second, with window proportions driven by daylight and overheating checks. Third, carbon is a design constraint reviewed at every stage, not a calculation added at the end.

Orientation and massing

The long façade faces south-east onto the street, which gives the workspace floors useful morning sun and allows deep overhangs to control summer gain. The north-west elevation is mostly solid, with a few high-level openings for cross-ventilation. Massing steps down on the south-west edge so the neighbouring courtyard keeps its sunlight. Annotate each diagram with what it changed: for instance, “reducing the south-west shoulder by one storey lifted the courtyard’s winter sun hours and removed 140 m² of upper floor area”. That figure is illustrative, but the habit of tying every diagram to a decision is what the brief rewards.

Structural strategy

Present the structure in three tiers. The primary system carries gravity and lateral load to the ground: a concrete core and glulam columns on a pile-supported transfer slab above the shops. The secondary system spans between primary elements: CLT floor panels spanning 6.0 m between glulam beams. The tertiary system covers lintels, balcony supports, stair trimmers and façade fixings.

The table compares three options that were tested. Keep the comparison honest: a good answer admits where the chosen option is weaker.

The hybrid option was chosen because it carried the lowest weight and carbon, but the core stays in concrete because lateral stability and the lift and stair enclosures are simpler and more robust that way. The testing evidence on the page should be your own: a hand span check on one CLT panel, a simple load path sketch, and a 1:20 model of one beam-to-column junction.

Façade build-up

The table gives the main external wall and roof types. U-value targets are the student’s own design aims, set tighter than a typical regulatory minimum so that the annotated checks have headroom. Always confirm limiting values against the guidance that applies to your site, such as Approved Document L in England or the Technical Handbooks in Scotland.

Explain ventilation in one sentence per room type. For example: the flats use mechanical ventilation with heat recovery, with openable windows for purge ventilation, so the airtight envelope is not compromised by trickle-vent leakage.

Fire strategy

Fire is a design driver for a mid-rise building with homes above commercial floors. Set out the strategy under three headings, and keep each to a few lines.

• Escape: two protected stairs serve the upper floors, with a protected lobby to each flat entrance and a separate escape route from the commercial floors. Travel distances are checked against the applicable guidance.
• Containment: the concrete core forms the main protected shaft. Cavity barriers sit at every compartment line within the ventilated façade, and the combustibility of external wall products is checked against the regulations for buildings of this height.
• Compartmentation: a fire-resisting floor separates the shops from the flats. Inside the flats, exposed CLT is limited to agreed areas, with the remainder encapsulated in plasterboard.

State which document governs your site. In England that is Approved Document B (Fire safety), with taller residential buildings facing extra requirements, so check the current volume. In Scotland the equivalent is the fire section of the Technical Handbook. A brief note that the strategy would be confirmed by a fire engineer is accurate and shows you understand your limits.

Embodied carbon as a design tool

Method. The brief asks for cradle-to-gate carbon (modules A1 to A3) for two groups, structure and envelope, in kgCO2e per m² of floor area. The approach is the same for both. List every major element, take quantities from the model or from take-offs, multiply by a carbon factor per unit, sum the results, then divide by gross internal floor area (GIA). The method sits within the whole life carbon framework of BS EN 15978 and the RICS professional standard, and the IStructE guide explains how to set boundaries for structural work. Factors can come from an educational dataset such as the ICE database, or from manufacturers’ Environmental Product Declarations where you can find them. State your source for each factor and your treatment of biogenic carbon in timber, since marks depend on transparency more than on a particular number.

Illustrative GIA used here: 6,400 m². Quantities and factors are omitted from the extract to keep it short, but on the real page show a worked line such as “CLT floors: 1,150 m³ x factor = tCO2e”.

Iteration. The brief wants recalculation during the semester and an explanation of what you changed. A short table does that clearly. All values are illustrative.

Reflection. The total fell from 410 to 285 kgCO2e/m², a reduction of about 30%, or roughly 800 tCO2e across the 6,400 m² building. The largest single gain came from the floor decision at stage 2, which also changed the acoustic and fire design. That is the integration point to write about: lowering carbon was not free, and the extra acoustic mass in the floors gave back some of the saving. Say what you would test next, for instance reusing a steel frame from a demolished building on a similar grid, or reducing the pile count with a lighter transfer structure.

For orientation on targets, the RIBA 2030 Climate Challenge and the LETI primer both give embodied carbon benchmarks for building types. Quote the current figure from the source you cite rather than from memory, and compare your final number with it.

Drawing annotations and the 1:20 section

The detailed section should cut through a part that tells the whole story, such as the junction of the CLT floor, the glulam beam, the façade rail and the insulated upstand at the balcony door. Use three lineweights: heavy for cut elements, medium for elements beyond, and light for hatching and dimensions. Hatch materials by convention, label each layer with its material and thickness, and call out the waterproofing line, the vapour control layer and the cavity barrier. Add a short key note beside each, so a marker never has to guess what a line is for.

On the plans and sections, annotate with decisions, not just names. “125 mm mineral wool between studs, gives 0.15 W/m²K with the lining zone” tells a marker more than “insulation”.

How to adapt this to your own submission

1. Replace the invented building with your own studio scheme and keep the structure of the text: position, site, structure, façade, fire, carbon.
2. Run your own carbon calculation with your own quantities and keep a dated record of each version.
3. Test at least one junction physically or digitally and show what the test changed.
4. Cite every external source, image and drawing in Harvard style, and check the reference style in your own handbook.
5. Keep the PDF within the page limit and make sure every page links back to the studio project.

For wider written coursework in construction subjects, you can also read our Unit 4 construction environment report sample or see the construction assignment help service. If your task is mainly a written report, report writing help may suit you better.

About the expert

Subject expert for this sample: Eleanor Lawrence, who holds a BTech in Civil Engineering from the University of Oxford. Her listed subject areas include Structural Analysis, Strength of Materials, Soil Mechanics, Fluid Mechanics and Construction Management, and she has worked as a civil engineer at a UK-based firm.

References

• Circular Ecology (2026) The ICE Database: embodied carbon. Available at: https://circularecology.com/embodied-carbon-footprint-database.html (Accessed: 28 October 2026).
• European Committee for Standardization (2011) EN 15978:2011 Sustainability of construction works: assessment of environmental performance of buildings: calculation method. Brussels: CEN. Available at: https://genorma.com/en/standards/en-15978-2011 (Accessed: 28 October 2026). Note: the catalogue lists this edition as withdrawn from March 2026 and replaced by EN 15978:2026.
• Gibbons, O.P., Orr, J.J. and Arnold, W. (2025) How to calculate embodied carbon. 3rd edn. London: The Institution of Structural Engineers. Available at: https://www.istructe.org/resources/guidance/how-to-calculate-embodied-carbon/ (Accessed: 28 October 2026).
• Royal Institute of British Architects (2021) RIBA 2030 Climate Challenge: aligning the targets across the built environment. London: Royal Institute of British Architects. Available at: https://www.architecture.com/knowledge-and-resources/knowledge-landing-page/riba-2030-climate-challenge-aligning-the-targets-across-the-built-environment (Accessed: 28 October 2026).
• LETI (2020) Embodied Carbon Primer. London: London Energy Transformation Initiative. Available at: https://www.leti.uk/ecp (Accessed: 28 October 2026).
• Ministry of Housing, Communities and Local Government (n.d.) Conservation of fuel and power: Approved Document L. Available at: https://www.gov.uk/government/publications/conservation-of-fuel-and-power-approved-document-l (Accessed: 28 October 2026).
• Ministry of Housing, Communities and Local Government (n.d.) Fire safety: Approved Document B. Available at: https://www.gov.uk/government/publications/fire-safety-approved-document-b (Accessed: 28 October 2026).
• Royal Institution of Chartered Surveyors (2023) Whole life carbon assessment for the built environment. 2nd edn. London: RICS. Available at: https://www.rics.org/content/dam/ricsglobal/documents/standards/Whole_life_carbon_assessment_PS_Sept23.pdf (Accessed: 28 October 2026).
• Scottish Government (2026) Building standards technical handbook: domestic, April 2026. Edinburgh: Scottish Government. Available at: https://www.gov.scot/publications/building-standards-technical-handbook-domestic-april-2026-pdf/ (Accessed: 28 October 2026).