Choosing a dormer company
The questions, checks and pitfalls that decide whether you end up with a solid, well-installed dormer or a cheap one that leaks within a year.
Short answer
What is a good dormer company?
A good dormer company writes a detailed quote, uses materials it can stand behind, runs a proper insulation package, knows the planning rules of your council, installs with its own fitters or a fixed crew, and is clear about warranty and aftercare. Price matters, but only once those things are equal.
The basics
The most important checks
| Topic | What good looks like | What to be careful of |
|---|---|---|
| Quote | Materials, sizes and insulation listed clearly | Vague items like 'standard package' |
| Production | Own workshop or a long-term partner | Different supplier every project |
| Fitters | Fixed crew, named on the project | Daily-hire labour without continuity |
| Permit | Company checks rules per roof side | Permit handed entirely to the homeowner |
| Insulation | R-value stated, no thermal bridges | Insulation 'included' without value |
| Warranty | Structure, waterproofing and finish separated | One blanket warranty without detail |
| Reviews | Multiple platforms, real names | Only star ratings, no written reviews |
| Aftercare | Named contact and response time | No service desk at all |
Risks
Common mistakes
Practical
A 25-point checklist
Checklist
Use this before you sign anything
- 01The quote lists materials by name and brand.
- 02Sizes (width, height, depth) are clearly stated.
- 03The R-value of the insulation package is named.
- 04Glazing type (HR++, triple) is specified.
- 05Frames are named: PVC, timber or aluminium.
- 06Interior finish is described, not just 'standard'.
- 07Exterior finish (cladding, paint) is named.
- 08Lead and flashing work is included in writing.
- 09Crane and transport are part of the price.
- 10Permit handling is described: who does what.
- 11Lead time and install duration are stated.
- 12Payment schedule is reasonable (not 100% up front).
- 13Warranty on structure is named separately.
- 14Warranty on waterproofing is named separately.
- 15Warranty on finish is named separately.
- 16Aftercare contact and response time are clear.
- 17Company has its own fitters or a fixed crew.
- 18References or photos of recent work are available.
- 19Reviews check out across multiple platforms.
- 20Terms and conditions are shared up front.
- 21Liability for damage during install is clear.
- 22Process for unexpected extra work is described.
- 23Handover protocol and snag list are explained.
- 24Insurance certificate is available on request.
- 25The salesperson does not pressure you to sign today.
Read next
Related guides
Guide
Dormer cost: what drives the price
The items that really explain why one quote is much higher than another.
Lees verderGuide
Dormer permits and planning rules
When you need permission, when you do not, and how aesthetics rules work.
Lees verderGuide
Types of dormers
Prefab, traditional, flat-roof, pitched-roof — which one fits your house.
Lees verderQuick answers
Frequently asked questions
FAQ
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01How many quotes should I get?
At least three, with identical specs. That way you compare on a level playing field.
02Is a company with in-house production automatically better?
Not automatically, but in-house production gives the company more control over quality and lead time.
03What is a reasonable warranty term?
Structure, waterproofing and finish should each be named separately. Ask for the exact written terms.
04How do I know if a price is realistic?
A price well below the market almost always cuts corners on insulation, finish or warranty. Compare per line item, not just on the total.
05Do I have to handle the permit myself?
Many companies offer a permit service. Ask who is responsible if the application is refused or objected to.
Conclusie
Choosing a dormer company is mostly about doing your homework on paper: a detailed quote, a written warranty, clear materials and honest answers to the questions in this guide. Once those are in order, price differences become meaningful — and your decision much easier.