The old version of this page felt like a story about uncertainty. A useful cost guide needs to help a homeowner decide whether the idea is in range before paying for drawings or chasing quotes. The aim here is not to promise a fixed price from a blog post. It is to show which parts of the project create the budget.
Aberdeen extension budget checker
This gives an early range only. It is not a quote, and it does not replace a measured survey, specification or local warrant/planning check.
Why square metre prices are only a starting point
Published UK guides often put extension costs into a broad per-square-metre range. That helps with first-stage thinking, but it does not know whether your Aberdeen property has a tight rear lane, drainage in the wrong place, a wall that needs steel support, a kitchen to relocate, or old electrics that have to be brought up to a safe standard during the work.
Simple form, straightforward access, dry living space, standard finishes and limited service changes.
Normal family extension with some structural opening, heating/electrical changes, better glazing and full decoration.
Kitchen, bathroom, drainage, steelwork, difficult access, premium finishes, major glazing or wider renovation work.
Budget layers to separate before asking for quotes
| Budget layer | What it includes | Why it changes the quote |
|---|---|---|
| Shell and structure | Foundations, walls, roof, insulation, openings, steelwork and weatherproofing. | Ground, span, roof form and opening size drive major cost changes. |
| Services | Electrics, heating, plumbing, drainage, ventilation and appliance routes. | A dry room is not the same as a kitchen, utility or bathroom extension. |
| Approvals and design | Measured drawings, structural engineering, planning where needed and building warrant. | Scottish building warrant fees are linked to the value of works, and professional drawings/specs reduce quote guesswork. |
| Windows and doors | Glazing, rooflights, bifolds, doors, lintels and thermal details. | Large openings change both structure and product cost. |
| Interior finish | Flooring, joinery, plastering, decoration, storage, kitchen or bathroom fit-out. | The finish can turn a modest shell into a much larger project. |
| Access and disruption | Scaffolding, skip location, narrow access, parking, neighbour constraints and protection of the existing house. | Labour time rises when the site is awkward or the home stays occupied. |
Aberdeen-specific checks
In Scotland, a building warrant is a separate building standards route from planning. The fee is normally based on the estimated value of works.
Some domestic extensions may be permitted development, but location, size, conservation context and previous alterations can change the answer.
Roof, insulation, damp detailing, render, drainage and external finishes need to suit the property and local exposure.
Old consumer units, drainage runs, heating capacity and ventilation routes can turn up only after a proper inspection.
What to prepare before a builder visit
- Measure the approximate new floor area and mark the wall that will be opened.
- Decide whether the new space is dry living space, kitchen, utility, bathroom or mixed use.
- List any must-haves: rooflights, bifolds, underfloor heating, fitted storage, new kitchen or accessible bathroom.
- Take photos of access, drains, boiler, consumer unit, existing roofline and the external wall.
- Ask early whether drawings, engineering, planning and building warrant support are included or separate.
Where ABC Home fits
ABC Home can help turn the early idea into a more practical building conversation: what the space is for, what services need moving, what existing parts of the house will be disturbed, and what should be priced as a separate allowance. The earlier those decisions are made, the fewer surprises sit inside the quote.
Sources and practical checks used
- HomeOwners Alliance extension costs guide: published UK homeowner guide used only as a broad early square-metre context, not as an ABC quote.
- Aberdeen City Council building warrants: local route for building warrant guidance and applications.
- Aberdeenshire Council building warrant fees: states that warrant fees are based on the estimated value of works.
- Scottish Government domestic technical handbook: wider domestic building standards reference for Scottish projects.
FAQ
What is a realistic extension budget in Aberdeen?
Use national square metre ranges only as a first filter, then adjust for Aberdeen site access, structure, ground conditions, drainage, services, finish level, drawings and Scottish building warrant costs. A measured survey and specification are needed before a quote is meaningful.
Does an Aberdeen extension always need planning permission?
Not always, but planning and building warrant are separate checks in Scotland. Some work may be permitted development, while structural, safety and energy standards still need the correct building standards route.
Why do extension quotes vary so much?
Two extensions with the same floor area can have very different costs if one needs steelwork, drainage changes, kitchen fitting, bathroom work, difficult access, high-spec glazing or major electrical/heating changes.
