Professional Loft Conversion Estimating Services Across the UK
Our loft conversion estimating service gives builders and contractors an itemised cost breakdown for every job. Each estimate shows the quantities, materials, labour and costs, so you can forecast spend on materials, workforce and budget before work starts on site.
Whether the job is a small roof-light conversion or a full roof-space makeover, you get a clear, line-by-line price that you can check and use with confidence.
What a Loft Conversion Estimate Includes
Each estimate is built from your plans and technical details, and covers:
- Quantity take-offs: roof structure, walls, floors, windows, stairs and finishes, measured from your drawings.
- Material lists: each item listed and priced separately.
- Labour splits: labour shown for each stage of the work, so you can see where the cost sits.
- Cost summary: totals for materials, labour and the overall estimate.
- Assumptions: inclusions, exclusions and assumptions written down, so the scope is clear.
Loft Conversion Types We Estimate
We cover the main types of loft conversion, from small jobs to larger roof-space makeovers:
- Dormer conversions: a box-shaped extension built out from the roof slope to create headroom and floor space.
- Hip-to-gable conversions: the sloping side of a hipped roof is extended to form a vertical gable wall, which adds usable space.
- Mansard conversions: a large rear roof extension with a near-vertical wall, giving a large amount of floor space.
- Roof-light conversions: new windows fitted into the existing roof slope, with the roof shape left as it is.
Each type is estimated with the same method, so you can compare options and see how each choice affects cost.
Why Choose Nextron for Loft Conversion Estimates
- Precise figures: quantities measured from your drawings, with each item shown separately.
- Dependable costing: the same method on every job, so estimates are consistent and easy to compare.
- Expert support: we answer your questions and explain the assumptions behind each figure.
- Credibility: a transparent estimate you can take to your client or use in a tender.
Our estimates are transparent, precise and prompt, so you can see where every figure comes from.
What We Need to Start
- Planning drawings, existing floor plans and roof plans
- Building Regulations drawings, where you have them
- Sections and elevations showing the existing roof shape and ceiling heights
- The specification for windows, stairs, finishes and any structural works
- Structural details, such as steel beam sizes, if the engineer has issued them
- Your programme or tender deadline
How Structural Works Are Priced
Structural works, such as steel beams, padstones, new joists and strengthening to the existing floor, are priced from the engineer's drawings or the specification you provide. Each beam and joist is shown as a separate line, so you can check the structure against the design.
Who Our Loft Conversion Estimates Are For
We prepare loft conversion estimates for UK builders, loft conversion specialists, main contractors and property developers who need a clear, itemised price before they tender or start on site.
How We Build a Loft Conversion Estimate
Each estimate follows the same steps, so you can follow the logic and check it against your drawings:
- Review the plans, specification and any engineer's drawings, and note any gaps.
- Take off the quantities for the roof, walls, floor, stairs, windows and finishes.
- Price each item, then add labour for each stage of the work.
- Write down the inclusions, exclusions and assumptions.
- Issue the estimate, answer your questions, and update it if the scope changes.
Loft Conversion Items We Price Line by Line
Where they appear on the drawings, we price each of these separately:
- Roof structure, rafters and ridge timbers
- Steel beams, padstones and new joists
- Dormer walls, cheeks and roof coverings
- Rooflights and windows
- Insulation, vapour control and ventilation
- Plasterboard and skim finish to walls and ceilings
- First fix and second fix electrics, including lighting and sockets
- Staircase, handrail and balustrade
- Doors, skirting and trim
Why Line-by-Line Pricing Helps Your Tender
A single lump sum makes it hard to see what is included or where the cost sits. A line-by-line estimate gives you a clearer basis for tender:
- You can compare tenders fairly, item by item.
- You can see which assumptions affect the price, and check them before you commit.
- You can test options, such as a different rooflight layout or staircase, and see the effect on cost.
- You can plan cash flow, because labour and materials are shown separately.
Loft Conversion Terms Explained
These terms come up in most loft conversion estimates:
- Dormer: a box built out from the roof slope to create headroom and floor space.
- Hip-to-gable: changing a sloping hipped end into a vertical gable wall.
- Rafter: a sloping timber that forms part of the roof structure.
- Joist: a horizontal timber that carries a floor or ceiling.
- Steel beam: a steel section that spans an opening where timber would not be strong enough.
- Padstone: a block placed under a beam to spread its load onto the wall below.
- Rooflight: a window fitted into the roof slope.
- Take-off: measuring quantities from the drawings.
What You Receive With Your Loft Conversion Estimate
Your estimate is set out so that you can check it and use it for tender. It normally includes:
- A short scope summary, listing the plans and documents used
- Quantity take-offs for each part of the conversion
- Material lists and labour splits
- A cost summary with the totals
- A list of inclusions, exclusions and assumptions
- A note of any information still needed to firm up the price
Frequently Asked Questions About Loft Conversion Estimating
What is included in a loft conversion estimate?
Each estimate covers quantity take-offs, material lists, labour splits and a cost summary. All of it is built from the plans and technical details you provide.
How long does it take to complete an estimate?
Turnaround is usually one to three working days. The exact timing depends on how large and complex the job is.
Can you estimate from planning drawings?
Yes. We can build estimates from planning drawings, Building Regulations drawings, tender packs or construction plans.
Do you estimate small loft jobs as well as large ones?
Yes. We cover small roof-light jobs as well as larger dormer, hip-to-gable and mansard conversions, using the same line-by-line method for each.
Do you provide a free sample estimate?
Yes. A free sample estimate is available, so you can see our format before you decide.
Do you price the structural works too?
Yes. Steel beams, padstones and new joists are priced from the engineer's drawings or the specification you provide.
What happens if the plans change after the estimate?
We update the affected items and show the change clearly, so you can see the effect on cost.
Related Estimating Services
Loft conversions often sit alongside other trades and design work. If your project also needs these services, we can provide them in the same format:
- Loft conversion design drawings
- Building regulations drawings
- House extension estimating services
- Roofing estimating services
- Electrical estimating services
- Plumbing estimating services
Get a Quote for Your Loft Conversion Estimate
Send us your plans and specification, along with the scope and any deadline you need to meet. If you want to see our format first, ask us for a free sample estimate.
Call us on +44 7576 532125, or email info@nextronestimating.co.uk. You can also use the Get a Quote button below.
